JPH05229686A - Paper conveying system - Google Patents

Abstract

PURPOSE:To cause wrinkling or curling paper to be flatly attracted to a paper conveyor belt. CONSTITUTION:A shute 9 for guiding paper to a pressing roller 3 and shutes 7, 8 for guiding paper from a feeding roller 6 to a paper attraction means are disposed above that side of a paper conveyor belt 1 which attracts paper. Paper P is made to rush toward the paper conveyor belt 1 through the shutes 7, 8 at an angle a of rushing and at the position of distance (t) in the upstream of the pressing roller 3 and is folded and advances toward the paper attraction means along the paper conveyor belt 1. Since the paper is made to move along the paper conveyor belt 1 as it is folded, the paper is prevented from curling or wrinkling due to its flexibility and can be attracted to the paper conveyor belt 1 while in a flattened state, and failure in image transfer can be prevented when the system is employed in a color image recording device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying system for adsorbing a sheet on a sheet conveying belt and conveying the sheet.

[0002]

2. Description of the Related Art A sheet conveying system for adsorbing a sheet onto a sheet conveying belt and conveying it is used in a color image recording apparatus such as a color copying machine or a color printer.
An example of the configuration is shown in FIG.

FIG. 13 is a so-called tandem type full-color electronic device in which four color developing units of yellow (Y), magenta (M), cyan (C), and black (K) are sequentially arranged along a paper transport path. It is a figure showing an example of composition of a paper transportation system of a photocopier. Each developing machine unit 100
A charger 107, a latent image writing unit 102, and a developing device 1 are provided around an electrostatic latent image carrier 101 including a photosensitive drum.
03 and a cleaner 106 are arranged, a toner image corresponding to the image information of each color is formed on the electrostatic latent image carrier 101, and the corresponding toner is applied to the paper conveyed by the paper conveying belt 1 which is an endless belt. Transfer image Corotron 10
5, the electrostatic transfer is sequentially performed. Therefore,
The sheet carried out from the supply tray 120 is attracted to the sheet conveying belt 1 by the electrostatic attraction force of the sheet attracting corotron 4 at a predetermined timing, and the toner image of each color is sequentially obtained from each developing unit 100 as the sheet progresses. Is transferred to carry a full-color toner image. Then, after the transfer of all the toner images is completed, the paper is peeled off from the paper transport belt 1 and then sent out onto the discharge tray 114 via the fixing device 113, and the recording of the color image is completed. On the other hand, the sheet conveyor belt 1 is neutralized by the belt neutralizer 117 prior to the next image recording cycle. In FIG. 13, 3 is a pressing roller, 5 is a support roller, 6 is a delivery roller, and 110 is the paper transport belt 1.
Is a static eliminator for peeling off the paper on which the transfer of the toner image is completed, 115 and 116 are rollers, and 118 is a cleaner.

[0004]

By the way, in the conventional paper conveying system as shown in FIG. 13, when the paper is introduced into the paper conveying belt, as shown in FIG. The method of introducing the paper P into the paper or the method of introducing the paper P directly below the suction roll 3 at a predetermined plunge angle α with respect to the paper transport belt 1 as shown in FIG. 14B is adopted. In the above, there was a problem that a toner image transfer failure on the paper P may occur, and when the degree is severe, so-called image omission occurs.

That is, when the paper P is always smooth, the paper P is attracted to the paper conveying belt 1 smoothly, so that there is no problem even with the conventional introduction method.
Is not always smooth, and a paper containing a large amount of water or a paper partially moistened with undulations or wrinkles in the horizontal or vertical direction may be used. In such a case, the paper P is used. Does not stick to the paper transport belt 1 smoothly, and a part of the paper P floats from the paper transport belt 1, resulting in defective transfer and image loss.

Further, as the delivery roller 6, FIG.
As shown in FIG. 5, a roll shaft 11 in which the roll portion 11 is arranged in a so-called dumpling shape may be used. However, when such a roller is used, the paper P is initially in a smooth state. In this case, as shown in FIG. 9B, the sheet rushes into the sheet conveying belt 1 while maintaining the vertical swell, so that the same problem as described above may occur. Even if a sheet is used, the same problem occurs when the sheet is curled, wrinkled, or has a so-called peculiarity during the conveyance and enters the sheet conveyance belt 1. There are things.

The present invention solves the above-mentioned problems and provides a paper conveying system capable of favorably adhering a paper to a paper conveying belt even when a paper having wrinkles or undulations is used. The purpose is.

[0008]

In order to achieve the above object, a sheet conveying system of the present invention is a sheet conveying system in which a sheet adsorbing means adsorbs a sheet onto a sheet conveying belt and conveys the sheet. While thrusting the paper at a predetermined distance on the upstream side of the means at a predetermined angle,
It is characterized in that a sheet introducing means is provided which bends the sheet that has plunged into the sheet and conveys the sheet to the sheet adsorbing means along the sheet conveying belt.

[0009]

When the sheet is introduced into the sheet conveying belt, the sheet is bent so that the sheet is moved along the sheet conveying belt, so that the waist of the sheet itself eliminates undulations and wrinkles, and the sheet is conveyed in a smooth state. Can be adsorbed on the belt. Therefore, when the present invention is applied to a color image recording apparatus, transfer defects can be prevented.

[0010]

Embodiments will be described below with reference to the drawings.
FIG. 1 shows the configuration of an embodiment of a sheet conveying system according to the present invention. In the figure, 2 is a drive roller, and 7, 8 and 9 are chutes. In FIG. 1, the same components as those in FIG. 13 are designated by the same reference numerals.

The drive roller 2 holds the paper carrying belt 1 by applying a predetermined tension to the paper carrying belt 1 with a tension roller (not shown). Paper suction means is arranged between the drive roller 2 and the support roller 5. That is, the pressing roller 3 is in contact with the paper transport belt 1 with a predetermined load on the paper suction side of the paper transport belt 1.
An adsorption corotron 4 for supplying an electric charge for adsorbing the sheet to the sheet conveying belt 1 is arranged on the opposite side of the sheet sandwiching the sheet. A chute 9 that guides the paper to the pressing roller 3 and chutes 7 and 8 that guide the paper from the feed-out roller 6 to the paper suction means are arranged above the paper transport belt 1 on the side where the paper is sucked. These chutes 7, 8 and 9 constitute the sheet introducing means in the present invention.

In the configuration shown in FIG. 1, the sheet P is conveyed to the delivery roller 6 by a sheet delivery means (not shown), passes through the delivery roller 6 and the chutes 7 and 8, and the distance t on the upstream side of the pressing roller 3 at the plunge angle α. At the position of, the sheet feeds into the sheet conveyance belt 1, is bent as shown in FIG. 2, and enters the sheet suction means along the sheet conveyance belt 1. Here, the plunge angle α is an angle exceeding 0 °,
It can be arbitrarily determined within the range of angles up to about ° as required. Also, with respect to the distance t, if the distance t is made too large, the above-mentioned problems occur, so it is preferable to set it to about 5 cm to 20 cm.

The paper feeding system shown in FIG. 1 was applied to a conventional color image recording apparatus to make a copy, and an image dropout evaluation test was conducted. 4 to 12 are diagrams showing the results of the copy test, and in all cases, the speed of the paper transport belt 1 is
160mm / sec, adsorption corotron voltage of adsorption corotron 4
The load of 6 kV and the pressing roller 3 is 200 gf. As the paper, a new smooth paper with a moisture content of about 5% (hereinafter referred to as paper 1) is left in a high humidity environment with a stack of 250 sheets, and as shown in FIG. 3 sheets of paper (hereinafter referred to as paper 2) that has a curl in the width direction as shown in FIG. 3B and has a float of about 10 mm when placed on a flat surface (hereinafter referred to as paper 3). Used different types of paper. The paper size was A3 and the paper was fed vertically. In FIGS. 4 to 12, the mark “◯” indicates that the image was properly copied without any omission of the image, the mark “Δ” indicates that the omission of the image occasionally occurred, and the mark “x” represents the image. Indicates that image dropouts frequently occurred. Therefore, for example, in FIG. 5, it can be seen that image loss frequently occurs when α is 5 ° and 10 ° in the configuration of FIG. 4, and t is 10 mm, α in the configuration of the present invention shown in FIG. It can be seen that image dropouts sometimes occurred when were 5 ° and 10 °.

According to the results of the above-mentioned evaluation test, in the conventional case, the paper having wrinkles and undulations enters the paper suction means as it is.
It has been confirmed that the sheet is folded at the time when the sheet enters the sheet conveying belt 1 and smoothed as shown in FIG.
Further, as can be easily understood from FIGS. 4 to 12, it is understood that the transfer failure can be prevented by selecting t and α.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the present invention.

FIG. 3 is a diagram showing a sheet used for an evaluation test.

FIG. 4 is a diagram showing a result of an evaluation test.

FIG. 5 is a diagram showing a result of an evaluation test.

FIG. 6 is a diagram showing a result of an evaluation test.

FIG. 7 is a diagram showing a result of an evaluation test.

FIG. 8 is a diagram showing a result of an evaluation test.

FIG. 9 is a diagram showing results of evaluation tests.

FIG. 10 is a diagram showing a result of an evaluation test.

FIG. 11 is a diagram showing a result of an evaluation test.

FIG. 12 is a diagram showing a result of an evaluation test.

FIG. 13 is a diagram showing a configuration example of a paper transport system of a tandem type full color electrophotographic copying machine.

FIG. 14 is a diagram showing a configuration example of a conventional paper transport system.

FIG. 15 is a diagram for explaining a problem of the conventional paper transport system.

[Explanation of symbols]

P ... Paper, α ... Plunge angle, 1 ... Paper transport belt, 2 ... Drive roller, 3 ... Pressing roller, 4 ... Adsorption corotron,
7, 8, 9 ... Shoot.

Claims (1)

[Claims] 1. A sheet conveying system for adsorbing a sheet onto a sheet conveying belt by a sheet adsorbing means and conveying the sheet, wherein the sheet is thrust at a prescribed distance upstream of the sheet adsorbing means at a prescribed angle, and A sheet conveying system comprising: a sheet introducing unit that bends a sheet that has plunged into the sheet and conveys the sheet along the sheet conveying belt to the sheet suction unit.