JPS60242150A - Paper feed device - Google Patents

Abstract

PURPOSE:To prevent papers from being fed in an overlapping condition and to make it possible to feed papers one by one to a predetermined position, by providing such a paper discharge member that one of two papers paid out in the vicinity of a transfer means by a pay-out means is absorbed and removed off. CONSTITUTION:The topmost one of papers accumulated in a paper tray 1 is paid out by means of a paper pay-out roll 2, and the leading end of the paper is inserted between transfer rolls 15, 15 so that the paper is transferred and fed to a predetermined position by means of a vacuum type conveyor belt 3. When two papers 5 overlaped with each other are paid out and fed, the upper one of the two papers 5 is absorbed onto the adhesive surface 11 of a paper discharge roll 4 and wound onto the paper discharge roll 4 while the lower one of the papers 5 is transferred in the direction of the arrow, being absorbed by the vacuum type conveyor belt 3 and is fed to the predetermined position. Accordingly, no errors in copying and printing occure, and as well it is possible to prevent papers from jamming in the intermediate part of the transfer path.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a paper feeding device of a copying machine, a printing machine, or a document feeding device of a copying machine, in which paper stored in a paper tray is
The present invention relates to a paper feeding device that feeds sheets one by one to a predetermined position, and particularly relates to a paper feeding device that can prevent double feeding of sheets.

[Prior art]

Conventionally, as a paper feeding device that supplies sheets of paper stored in a paper tray to a predetermined position one by one, a paper tray (as shown in FIG. a), a feed roll (el) that is provided above this paper tray (a) and feeds out the stored paper (bl) one by one, and a feed roll (el) that is provided in front of the paper tray (al) and feeds out the stored paper (bl) one by one. The belt consists of a vacuum conveyor belt (dl) that conveys the paper (bJ) stacked in the paper tray (a) to a predetermined position, and a type that feeds the paper (bJ) stacked in the paper tray (a) in increments of IQ from the top surface, as shown in Figure 2. As shown in FIG. f) and an air chamber (g) provided above the conveyor belt (f), and air is directed from a nozzle (h) attached to the air chamber (g) toward the conveyor belt Hf). There is a known type in which the paper (bl) deposited in the paper tray f8) is supplied one by one from the bottom surface by spraying the paper.

However, in these devices, the paper tray (
When paper (bl) is fed out one by one from a), two identical papers (b') adjacent to this paper (b) are attracted to one identical paper (bl) due to frictional force, electrostatic force, etc. , 8th
As shown in the figure, there were cases where two sheets were unrolled overlapping each other.

For this reason, there is a drawback that two sheets of paper (b) are fed to the image forming section or platen of a copying machine, or the printing section of a printing machine at the same time, resulting in copying or printing errors. There is a drawback that a paper jam (also called a jam) occurs during the transport path of the BL.

[Purpose of the invention]

The present invention eliminates and improves the shortcomings of the prior art described in ``2'' and ``2'' adsorbs one of two sheets of paper fed out by a feeding means near a conveying means such as a conveying belt. It is an object of the present invention to provide a paper supply device that can prevent double feeding of paper by providing a paper removal member.

[Structure of the invention]

That is, the present invention comprises a paper tray, a feeding means for feeding out sheets of paper stored in the paper tray one by one, and a conveyance means for conveying the sheets fed out by the feeding means, and the paper tray is stacked on the paper tray. 1 sheet of paper
In a paper feeding device that feeds sheets of paper one by one to a predetermined position, double feeding of paper can be prevented by providing a paper removal member near the conveying means that adsorbs and removes one of the two sheets of paper fed out by the feeding means. This makes it possible to stably feed the sheets of paper stacked on the paper tray one by one to a predetermined position.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. ), and a paper removal roll (4).

First, the paper tray (11) is provided inside the copying machine main body (not shown), and the paper (5) stored in the paper tray (1) is placed one by one at the upper front side. A feeding roll (2) for feeding is provided.

On the other hand, in front of the paper tray (1), a photosensitive drum (
A vacuum type conveyor belt (3) for conveying to a predetermined position, such as (not shown), is provided.

Nainai Tsuchiko's vacuum conveyor bell) (31c, ff
An endless belt (6) with a large number of micro holes (not shown) formed on its surface, a drive roll +71 +71 around which this endless belt (6) is wound, and an endless belt (6) provided inside the endless heald (6). It is configured to attract the paper (5) fed out by the -1- feed roll (2) and transport it in the direction of the arrow.

A paper removal roll (4) that rotates in the direction of the arrow along the width direction of the vacuum conveyor belt (3) is disposed near the top of the vacuum conveyor belt (3).
When the two sheets of paper (5) are fed out by
- The paper removal roll (4) is a cylindrical body that is rotatably supported in the direction of the arrow as shown in FIG. Concave groove (101+10
) is formed, and eight adhesive sheets (111(II) (Ill) are attached to the outer peripheral surface thereof.

Also, this paper removal roll (4) has two guide plates (12 (
1 sides are attached parallel to each other, one end side of which is fitted into the concave groove (10) of the paper removal roll (4), and the other end side is fitted into the bottom plate of the removal tray (9). (
13) (see Figure 4).

In Fig. 4, (141 (14)), the paper surface attracted by the paper removal roll (4) is transferred to the removal tray (9).
) for delivery to f151 (15
1 transfers the paper (5) fed out from the paper tray (1) by the feeding roll (2) to the vacuum conveyor belt (3).
) are shown, respectively.

In order to feed paper to a predetermined position using the paper feeding device of the present invention, as shown in FIG.
One sheet of paper (5) on the top surface accumulated in
51 +151, and vacuum conveyor bell l
After being conveyed to -+31, it is fed to a predetermined position by this conveyor belt (3).

Here, when two sheets of paper (5) are fed out in an overlapped manner, that is, when they are fed in duplicate, the paper (5) on the upper side of the two sheets of paper (5) is moved to the paper removal roll as shown in FIG. (4) is adsorbed by the adhesive sheet (Ill) and wound onto the paper removal roll (4), while the paper (5) on the lower side is adsorbed by the vacuum conveyor belt (3) and conveyed in the direction of the arrow. supplied to the position.

Note that the surface of the paper taken up by the paper removal roll (4) is
) As shown in the figure, its tip is the guide plate f12) IJ2
), and is simultaneously peeled off from the adhesive sheet (IIl) on the paper removal roll (4) and transferred to the transport roll H (14
1 and discharged onto a rejection tray (not shown).

In this way, in the paper feeding device of the present invention, even if two sheets of paper (5) are fed out in an overlapping manner, one of the sheets of paper (g) is removed by the paper removal roll (4) and two sheets of paper (g) are removed. Since the two sheets of paper (5) are not sent to the image forming section, printing section, platen, etc. at the same time, copying or printing errors will not occur, and the sheets will not get jammed in the middle of the conveyance path.

In this embodiment, an adhesive sheet (IIl) is used as the paper suction means for the paper removal roll (4), but a vacuum box is disposed inside the paper removal roll (4), and the paper removal roll (4) It goes without saying that a method may also be adopted in which a large number of microholes communicating with the vacuum hook are opened at arbitrary locations on the outer circumferential surface and the paper is attracted by the suction force of the holes.

Furthermore, in this embodiment, the feeding roll (2) is used to feed out the sheets of paper (5) one by one from the paper tray (1), but instead of this, a method using a paper separation claw is adopted. The method may be arbitrary, or may be a method of blowing air and blowing out the sheets one by one.

〔Effect of the invention〕

As described above, the present invention has a structure in which a paper removal member is provided near a conveyance means such as a conveyance belt, so that even if two sheets of paper are fed out from a paper tray in an overlapping manner, one of the sheets is removed from the paper removal member. The two sheets are removed by the member and are not conveyed to the image forming section or platen of a copying machine or the printing section of a printing machine at the same time.

Therefore, there will be no copying or printing errors,
Moreover, the present invention has great practical effects, such as no paper jamming during the conveyance path.

[Brief explanation of the drawing]

1 to 2 are side sectional views of a conventional paper feeding device, FIG. 3 is a partially enlarged view of FIG. 1, and FIGS. 4 to 7 show an embodiment of the present invention. , FIG. 4 is a side sectional view of the paper feeding device of the present invention, FIG. 6 is a partially enlarged view of FIG. 4, and FIGS. 5 and 7 are partial perspective views of the paper feeding device of the present invention. . Explanation of symbols (1)...Paper tray (2)...Feeding roll (3)...Transport belt (4)...
... Paper removal roll +51 tg+ ... Paper (6) ... Endless belt (7) ... Drive roll (81 ... Vacuum box (9
)...Exclusion l/ray (10)...Concave groove (11)...Adhesive sheet (12)...
・Guide plate (13)...Bottom plate (141+15
1... Conveyance Roll Patent Applicant Fuji Xerox Co., Ltd. Agent Tomohiro Nakamura Patent Attorney Katsuo Naruse Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 paper tray and the paper stored in this paper tray.
In the paper feeding device, which is composed of a feeding means for feeding out sheets one by one, and a conveying means for conveying the sheets fed out by the feeding means, and feeding the sheets accumulated in the paper tray one by one to a predetermined position, the above-mentioned conveying means A paper feeding device characterized in that a paper removing member is provided near the feeding device to remove one of the two sheets of paper fed out by the feeding device by suction.