JPH0356338A - Overlapped feeding preventing structure - Google Patents

Abstract

PURPOSE:To simply prevent the overlapped feeding of paper sheets by providing an overlapped-feeding preventing member having projections projected upward at the upper end periphery, in appropriate spaces in the width direction of paper sheets. CONSTITUTION:Paper sheets P to be fed are disposed one by one and transferred by projections 11, 12 which are arranged in appropriate intervals, not in the entire upper periphery of an overlapped-feeding preventing member 10. Thereby, the overlapped feeding of paper sheets can be prevented.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a double-feed prevention structure that can be adopted in copying machines and facsimile machines, and particularly relates to an improvement in the double-feed prevention structure of paper in a paper feeding mechanism. be.

Traditional technology> The paper feed mechanism of copying machines, facsimile machines, etc. usually employs a double-feed prevention structure to prevent double-feeding of sheets.

Double feeding occurs when multiple sheets of paper set in a stack are fed out one by one from the top using the advance roller.
In some cases, Gomshi 1. was used as +17 q.

<Invention is a corner'? Problems to be Solved> For example, as schematically shown in FIG. 3, a conventional rubber sheet is arranged so that it is engraved on the surface through which the paper P fed by the forward feed roller 2 passes, so that the entire sheet protrudes upward. was. However, in order to effectively prevent double feeding of paper using the rubber sheet arranged in this way, the amount of protrusion of the rubber sheet must be adjusted, and this adjustment is difficult. there were.

Therefore, an object of the present invention is to provide a structure for preventing double feeding of sheets, which has a simple structure and is not difficult to adjust.

Means for Solving the Problems> The present invention provides a means for solving the problems in which multiple sheets of paper are set in a stacked state.
It has a structure that prevents double feeding of sheets when feeding sheets one by one from two sheets, and includes a double feeding prevention member arranged so that the leading edge of the set sheets comes into contact with it, and the double feeding prevention member The top edge of the paper has a portion C projecting upward at an appropriate interval in the width direction of the leading edge of the paper.
This is a mechanism to prevent double feeding.

Function> The sheets to be sent out are not separated by the entire upper edge of the double-feed prevention member, but are separated and sent one by one by the convex portions spaced at appropriate intervals.

Embodiment> FIG. 1 is a schematic side view showing the structure of a paper feeding mechanism of a copying machine according to an embodiment of the present invention.

Moreover, FIG. 2 is an illustrative view of the mechanism of FIG. 1 viewed from a direction orthogonal to the conveying direction along line -H.

This paper feeding mechanism consists of a paper tray on which the paper P is set, a forward feed roller 2 for not sending out the river paper P set on the paper tray 1, and a paper tray 1-'2. It includes a leading edge regulating plate 3 for adjusting the leading edge of the paper that has been fed, and a double feeding prevention plate 10 attached to the leading edge regulating plate 3.

The paper table 1 is swingably provided in FIG. 1, and even if the amount of paper P set on it changes, the top surface of the paper P is pressed against the advance roller 2 with a constant force. It is made to be.

In this embodiment, the double-feed prevention plate 10 is made of a rubber sheet, and as shown in FIG. It has a convex portion 11.12.

To explain in more detail, the upper edge of the double-feed prevention plate]-〇 is
Most of the height is approximately the same as the upper edge of the tip regulating plate 3, but the two protrusions 11 and 12 protrude upwards from the upper edge of the tip regulating plate 3, and are indicated by broken lines in FIG. It intersects with the paper passing plane T shown in FIG.

When the multi-feeding rib plate 10 is shaped like this, when the paper is fed out by the forward-feeding reroller 2, the paper is pushed against the convex portion 11.
．． 12 and are rubbed one by one. Therefore, it is possible to prevent the paper from being fed multiple times during feeding.

For example, the distance between the two convex portions 1] and 12 provided on the double-feed prevention plate 10 is larger than the length of the short side of an official postcard,
It is preferable to make the interval smaller than the length of the short side of B5 paper.

Note that the convex portion 11. , 12, the paper feeding mechanism feeds i-
It is sufficient to set an appropriate interval according to the available paper size.

Further, it is preferable that the convex portions are symmetrical when viewed from a direction orthogonal to the paper conveyance direction. Further, in consideration of sending out relatively thick sheets of small size such as postcards, no convex portion is provided in the center portion.

Note that the number of protrusions does not have to be two as in this embodiment, but may be four.

Furthermore, in this embodiment, the double feeding prevention plate 10 is formed of a rubber sheet, but in addition to a rubber sheet, a plastic sheet may also be used.
1- It may be made of iron plate or the like.

Further, the double feed prevention plate 10 may be integrated with the leading edge regulating plate 3, and the upper edge of the leading edge regulating plate 3 may be projected upward in portions 5 at an appropriate interval.

The paper feeding mechanism according to this embodiment further includes guide plates 4, 5.6 for guiding the paper being conveyed, and a paper feeding roller 7 for feeding the paper sent out by the advance reroller 2 into the interior.
A pad 9 attached to the mounting plate is provided.

The guide plate 4 is integrally formed with the tip regulating plate 3.

The pad 9 is made of urethane rubber, for example, and has a comb-like shape having concavities and convexities in a direction transverse to the paper conveyance direction.

This pad 9 serves to prevent double feeding by waving the sheets in a direction crossing the conveying direction and separating them one by one when the sheets are conveyed.

When the paper P is sent out by the forward feed roller 2, the double feed prevention 1
1. Double feeding is prevented by the board 10, but in the event that sheets are fed double, they will be separated by the pad 9, so that the paper fed by the paper feed roller 7 will surely be one sheet. Become.

The double feeding prevention plate 10 according to the present invention is not limited to the above-mentioned six embodiments, but is applicable to a total of 1 m of a paper feed cassette of a copying machine, for example.
It may be provided in the section. By doing so, when the sheets are fed one by one from the paper feed cassette, double feeding of the sheets can be prevented.

It goes without saying that the present invention can also be used in a paper feeding mechanism of a facsimile machine.

Effects of the Invention> Since the present invention is constructed as described above, double feeding of sheets can be prevented with a simple structure when feeding sheets with the sheet feeding roller.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing the configuration of a paper feeding mechanism according to an embodiment of the present invention. FIG. 2 is a view taken along line 1-H in FIG. FIG. 3 is a schematic side view showing an example of the structure of a conventional double-feed prevention part shrine. In the figure, 2...forward feed roller, 3...tip regulating plate, 10...double feeding prevention plate, 11.12...convex portion are shown. 7

Claims (1)

[Claims] 1. Multiple sheets of paper set in a stack When feeding out one sheet at a time from the top, It has a structure that prevents double feeding, The leading edge of the loaded paper will touch the Equipped with a double feed prevention member placed in the One, The double feed prevention member is placed in the width direction of the leading edge of the paper. At an appropriate distance apart, the upper edge of the It is characterized by having a convex part that protrudes to Double feed prevention structure.