JPH07206243A - Paper discharging device - Google Patents

Abstract

PURPOSE:To discharge paper in a difficult-to-bend condition onto a discharging tray, and prevent wrinkles or waving from being generated even while a pair of discharging rolls are switched back. CONSTITUTION:This paper discharging device, which is equipped with a driving roll 12 and a driven rolls 13a-13d for clamping and discharging processed paper, is provided with plural driven rolls 13a-13d which are brought into rolling contact with the driving roll independently-mounted in the axial direction, where the respective driven rolls 13a-13d are inclined in a fixed direction to a paper traveling direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet discharging device for a transfer device such as an electrostatic copying machine or a printer.

[0002]

2. Description of the Related Art A transfer device, for example, a paper discharge device of a copying machine is shown in FIG. 1, and a paper 3 having a toner image transferred by passing between a photosensitive material 1 and a transfer portion 2 is heated. The toner image is fixed on the sheet 3 by passing through a fixing device 6 including a roll 4 and a pressure roll 5, and then a discharge roll pair 7 including a driving roll 7a and a driven roll 7b.
It is designed to be discharged to the discharge tray 8 through the.

At this time, when the paper 3 has a high water content and a large curl occurs in the fixing portion, or when the paper itself has no rigidity such as thin paper, that is, a so-called paper without stiffness, as shown in FIG. The paper 3 is ejected in a curled state in the ejection tray 8 and there is a problem in its storability.

As a means for solving this problem, Japanese Unexamined Patent Publication No.
No. 23153 and Japanese Patent Application Laid-Open No. 2-144363 have been proposed, all of which cause the paper to have rigidity by a pair of discharge rolls and cause a curl of the paper to cause poor accommodation. In the former case, the diameter of the discharge roll pair is changed, and in the latter case, the pressure contact position of the discharge roll pair is set on the outer peripheral surface of the roll. I try to make it non-linear.

[0005]

However, in recent years, in many small copying machines, printers and the like, the discharge tray portion is often used as an inverter for stackless copying at the time of double-sided copying. In the former method, wrinkles occur during the switchback operation of the discharge roll pair during double-sided copying, and in the latter method, the effect of increasing the rigidity of the paper is insufficient.

The present invention has been conceived in view of the above, and by imparting rigidity to the paper when the paper is discharged to the discharge tray, even if the base material itself is weak, such as water-containing paper, OHP film, thin paper, etc. To provide a sheet discharging device in a transfer device capable of preventing curl generation above and capable of favorably performing double-sided copying without causing waviness on a sheet even when a pair of discharging rolls is used as an inverter. The purpose is.

[0007]

In order to achieve the above-mentioned object, in a paper discharge device comprising a drive roll and a driven roll for pinching and discharging a processed paper according to the present invention, a driven roller rollingly contacted with the drive roller. A plurality of rolls are independently provided in the axial direction, and each of the driven rolls is inclined in a certain direction with respect to the paper traveling direction. The driven roll has a larger angle with respect to the paper reference direction as the driven roll is located farther from the reference discharge position on the discharge tray.

[0008]

[Operation] The paper ejected from the paper ejection device is ejected while being deformed into an arch shape by the tilted driven rolls, and rigidity is imparted by this deformation.

[0009]

EXAMPLE An example of the present invention will be described with reference to FIG. Since FIG. 3 shows a main part of the paper discharge device, the discharge roll pair 11 of the paper discharge device includes a plurality of single rolls 12a, 12b,
Driving roll 1 in which 12c and 12d are concentrically integrated
2 and each single roll 12a, 12 of this drive roll 12
Each of b, 12c, and 12d includes driven rolls 13a, 13b, 13c, and 13d that individually roll.

The drive roll 12 is arranged at a right angle to the sheet advancing direction toward the discharge tray 8.
On the other hand, the driven rolls 13a to 13d are provided independently of each other and are inclined with respect to the sheet advancing direction.
FIG. 4 shows an example in which the reference discharge direction of the sheet coincides with the sheet advancing direction, and the driven rolls 13a to 13d are directed toward the sheet advancing center line L side. At this time, the outer driven rolls 13a, the inclination angle theta ₁ and the inner driven roller 13b of the 13d, 13c inclination angle theta ₂ may be the same of or θ _1> θ ₂ in to the driven roller 13a, the ~13d paper You may make it converge toward one certain point of the traveling center line L.

In FIG. 5, the standard discharge direction of paper is the discharge tray 8.
In this example, the driven rolls 13a to 13d are tilted toward one side of the discharge tray 8. The inclination angles α ₁ , α ₂ , and
α ₃ becomes larger as it is located on the outer side than the inner side, and α ₁ <α ₂ <α ₃ <α ₄ .

In the above structure, the paper 3 fed by the pair of discharge rolls 11 having the above structure is subjected to a force from the left and right in the traveling direction toward the center side in the embodiment shown in FIG. As shown in the figure, it is deformed into an arch shape, and rigidity is given by this deformation amount. Even in the case of the embodiment shown in FIG.
The paper 3 is discharged toward the side of the discharge tray 8 while being deformed into an arch shape, and the paper 3 is given rigidity.

Therefore, the sheets 3 discharged by the pair of discharge rolls 11 having the above-described structure are deposited in order on the discharge tray 8 without curling while maintaining rigidity.

When the discharge roll pair 11 is used as an inverter to perform double-sided copying, the discharge roll pair 11 is once switched over from the state of being projected to the discharge tray 8 side. Since a force pulling the sheet 3 to both sides acts on the sheet 3, the arched sheet on the side of the discharge tray 8 travels in the opposite direction while returning to the original flat state, and then in the double-sided path thereafter. There were no wrinkles or other damage. In the above embodiment, the drive roll 12 may be a straight shape having a single diameter.

[0015]

According to the present invention, the paper 3 discharged in the direction of the discharge tray 8 is deformed in the shape of an arch to give rigidity. Therefore, when the paper 3 is discharged as it is onto the discharge tray 8, the paper 3 is discharged with a strong strain, so that the paper (OH
(Including P film), it is deposited in an orderly manner without wrinkling, wavy deformation, or curling.

On the other hand, as in the case of double-sided copying, when the discharge roll pair 11 is used as an inverter and the paper 3 is switchback-fed by the discharge roll pair 11, the paper 3 before the switchback is wrinkled or corrugated. Since there is no deformation, it is possible to run the paper for double-sided copying without causing wrinkles or other deformation.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view showing a copying machine to which a paper discharge device according to the present invention is applied.

FIG. 2 is an explanatory diagram showing a sheet discharge state in a conventional sheet discharge device.

FIG. 3 is a perspective view showing a paper discharge device.

FIG. 4 is a plan view showing an embodiment of the present invention.

FIG. 5 is a plan view showing another embodiment of the present invention.

[Explanation of symbols]

1 ... Sensitive material, 2 ... Transfer part, 3 ... Paper, 4 ... Heating roll, 5
... pressure roll, 6 ... fixing device, 7, 11 ... discharge roll pair, 8 ... discharge tray, 12 ... drive roll, 12a, 12
b, 12c, 12d ... Single roll, 13a, 13b, 13
c, 13d ... Driven roll.

Claims (2)

[Claims] 1. A paper discharge device comprising a drive roll and a driven roll for pinching and discharging the processed paper,
A sheet ejecting device, wherein a plurality of driven rolls which rollly contact a drive roll are independently provided in the axial direction, and each of the driven rolls is inclined in a certain direction with respect to the sheet traveling direction. 2. The sheet ejecting apparatus according to claim 1, wherein the driven roll located farther from the reference ejection position on the ejection tray has a larger angle with respect to the paper reference direction.