JPH0323153A - Sheet discharge device - Google Patents

Abstract

PURPOSE:To curve a sheet like a wave and give a suitable amount of stiffness thereto by varying a nipping and pressing position when the sheet is nipped and discharged via a drive roller and a follower roller respectively comprising a plurality of single rollers. CONSTITUTION:The sheet discharge device in the title is equipped with a drive roller 3a for pinching, pressing and discharging a treated sheet, and a follower roller 3b. The aforesaid drive roller 3a comprises a plurality of single rollers R1, R2, R3 and so forth, and the follower roller 3b comprises single rollers V1, V2, V3 and so forth respectively so arranged as to oppose the single rollers of the drive roller 3a. Moreover, the diameters of the single rollers are so changed as to obtain pinching and pressing positions with the drive and follower single rollers different from each other, depending upon each set of the single rollers. According to the aforesaid construction, the sheet is pinched and pressed like a wave, depending upon the variation of the pinching and pressing positions. As a result, the sheet is carried as stiffened, and the fatigue thereof is restrained, thereby stabilizing the discharge of the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a paper ejecting device suitable for a wandering paper device, particularly a copying machine.

[Conventional technology]

Generally, this type of ejecting device includes a drive roller and a driven roller that pinch and eject the processed paper, and the drive roller is composed of a plurality of single rollers, and the driven roller is connected to each single roller on the drive side. It consisted of a single opposing roller. The processed paper was then pinched and conveyed by multiple sets of single rollers on the driving and driven sides, and then ejected from the machine. [Problem to be solved by the invention] The above-mentioned conventional ejecting device does not allow paper to "sag" (
This refers to sagging due to insufficient strength. In this case, sagging in a direction perpendicular to the paper feeding direction may occur.

In particular, in the case of paper ejecting devices applied to copying machines, paper that has been heated by a heat fixing device and whose strength has been reduced is conveyed.
Such "sagging" is likely to occur. Furthermore, since the amount of curling of paper increases when it is heated, when paper is stacked after being ejected, it may not be stacked neatly due to ``sagging'' or ``curling.'' Further, the same applies when the paper mentioned here is made of a soft material such as O}IP film.

In view of the above points, the present invention provides a paper ejecting device that can stably transport even soft paper such as heated paper or OHP film without causing "sag" and at the same time correcting the curl of the paper. The purpose is to. [Means for Solving the Problems] In order to achieve the above object, the present invention includes a drive roller and a driven roller that pinch and discharge the processed paper, and the drive roller is composed of a plurality of single rollers. , in a paper ejecting device in which the driven roller is a single roller facing each single roller on the driving side, the pinching position by the single roller on the driving side and the single roller on the driven side is configured to be different for each set of single rollers. , the paper is curved in a wavy manner according to the amount of change in each clamping pressure position, making it possible to provide an appropriate stiffness. [Example] Hereinafter, as shown in the attached drawings, the paper discharging device of the present invention will be described.
This will be explained based on an example installed in a copying machine. Fig. 1 is a perspective view of the paper ejection device of the present invention, Fig. 2 is a front view of the roller portion of the paper ejection device while paper is being conveyed, and Fig. 3 is a fixing/paper ejection unit of a copying machine incorporating the paper ejection device of the present invention. FIG.

In the figure, 1 is a fixing/ejecting unit provided on the paper ejecting side of a copying machine incorporating the paper ejecting device of the present invention;
consists of a housing 1a, a fixing device 2, and a paper ejecting device 3, which are arranged in conjunction with each other within the housing 1a. The housing 1a is provided with an inlet H and an outlet H2, and transfer paper T (processed paper) with an electrostatic toner image formed on a photoreceptor (not shown) is transferred to the inlet H1. After the fixing process is carried out by the fixing device 2, the ejecting device 3 fixes and
The paper can be ejected to the outside of the paper ejection unit 1.

The fixing device 2 is composed of an upper heating roller 2a and a lower pressure roller 2b.
It is possible to convey the toner image on the transfer paper T while thermally fixing it by pinching the transfer paper T.

The paper ejecting device 3 is composed of a lower driving roller 3a and an upper driven roller 3b, and the rollers 3a and 3b convey the transfer gage T while pinching it, and transfer the transfer girder T to the paper ejection port H. ．． It is configured so that paper can be ejected from the The drive roller 3a includes five single rollers R, . , Rs , Ra
, Rs are arranged symmetrically with respect to the transport center O. On the other hand, the driven roller 3b is the single roller R on the drive side.
1 to R, 5 single rollers r+%
rz % rs , ra , rs are each rotatably provided on the driven shaft J2, and each single roller R1 to R on the driving side
, and the transfer plate T can be clamped and conveyed. Here, each single roller on the driving side R+, Rt,
Rs, R4, and Rs have different outer diameters, and the nip position (pinching position) of the transfer shaft T moves up and down in the direction of the drive shaft J (note that the single roller on the driven side r
Since l"-rs is fixed to the common shaft J., its outer diameter changes depending on the single roller R I" R s, but when the single rollers r1 to r1, (The outer diameter does not need to be changed.) Each single roller R.
, R. ,R. , R4, and R%, but in this example, the single roller R at the center has the smallest diameter, and the single rollers R1 and Rs at both ends have medium diameters. The remaining single rollers R2 and R4 have the largest diameter. That is, as shown in the second diagram, it is pinched by the drive-side single roller that changes from the left to medium → large → small → large → medium.
The nip position where the transfer T is pinched is middle → top → bottom →
It is structured so that it changes in a gentle wave shape from top to middle. For this reason, due to nip position fluctuation for each single roller set,
The entire transfer sheet T is curved in a wavy manner so that it can be "fixed" to the transfer paper T. The amount of variation in the nip position depends on the material of the transfer paper T used, but in the case of regular paper, it is approximately 0.1 to 4.0 mm at most.

In addition, each single roller R, , R. ,R,,R.
, R, may be arranged such that, for example, only the single roller R3 may be made smaller (or larger) than the other rollers, or only the single rollers R t and R s at both ends may be made smaller (or larger) than the other rollers. It can also be used as a precept.

In the embodiment described above, the transfer plate T to which the electrostatic toner image on the photoconductor is transferred and conveyed to the discharge port H1 of the fixing/conveyance unit is pressed between the heating roller 2a and the pressure roller 2b of the fixing device 2. After being heated and fixed, the sheet is pinched by the driving roller group and the driven roller group of the sheet ejecting device 3, and is ejected from the sheet ejecting port H2. At this time, the transfer paper T is transferred to each single roller R, , R on the driving side. , R. , R4, R5 and the single rollers r+, rz, rs, r4, rs on the driven side, each set has a different nip position, so they are squeezed in a wave-like manner, and are "stamped" and transported/discharged. It is enshrined.

〔Effect of the invention〕

As described above, the present invention includes a drive roller and a driven roller that pinch and discharge the processed paper, and the drive roller is composed of a plurality of single rollers, and the driven roller faces each of the single rollers on the driving side. A paper discharging device consisting of a single roller is characterized in that the pinching position of the driving single roller and the driven single roller is configured to be different for each set of single rollers, so that the paper pinching position can be adjusted. It is possible to provide stiffness according to the amount of change, and prevent "sagging" during transportation.

As a result, even in a copying machine that handles heated paper or soft paper such as OHP film, it is possible to realize a paper ejection device that can always stably eject paper, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the paper ejecting device of the present invention, Fig. 2 is a front view of the roller portion of the ejecting device while paper is being conveyed, and Fig. 3 is a fixing/paper ejection unit of a copying machine incorporating the paper ejecting device of the present invention. FIG. 1. Constant deposition/discharge unit 1a. 1. Housing 2. 1. Paper discharge device 2a. 1. Heating roller 2b. 1.1 Pressure roller 3. .. Fixed deposition device 3a. - One driven roller T - Transfer paper (paper) R1, Rz, R3, R4, Rs - Drive side single roller r+, rz, rx, ra, rs Mountain Driven side single roller J1 - Drive shaft J2 - Driven shaft Patent Applicant: Konica Corporation H5 Figure 2

Claims (1)

[Claims] A paper discharge device comprising a drive roller and a driven roller that pinch and discharge processed paper, the drive roller consisting of a plurality of single rollers, and the driven roller consisting of a single roller facing each of the single rollers on the drive side. A sheet discharging device characterized in that the pinching position by the driving side single roller and the driven side single roller is configured to be different for each set of single rollers.