JPS59214047A - Conveying device for copying paper - Google Patents

Abstract

PURPOSE:To guide even copying paper which is firm and short in between an upper and a lower roller smoothly by providing a means for curving and projecting a copying paper conveyor belt upwardly to the reverse surface side of the upper-side belt part of the conveyor belt. CONSTITUTION:An idling roller 20 which curves and projects the upper-side belt part 19a of the conveyor belt 19 of a copying paper conveying device upwardly is provided to the reverse-surface side of the belt part 19a to slants the terminal- side part of the device 12 slightly downward. Copying paper P is conveyed while sucked through a hole 21 to move along a slanting guide part 15, and its front edge part abuts on a roller 11A to droop and is guided in between the rollers 11A and 11B. When the copying paper P is such a postcard as is thick and firm, its rear edge is lifted to decrease the angle theta of entry and the copying paper is guided in between the rollers 11A and 11B smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is arranged near a copy paper separation device that separates copy paper from a photosensitive drum and near a fixing device located rearward and upper than the human remains separation device, and is arranged so as to copy paper through an inclined guide section. The present invention relates to an improved technology for a belt-conveying type copy paper conveying device that conveys paper with its leading edge in contact with the upper roller of the fixing device.

As shown in FIG. 1A, such a conventional copy paper conveying device has two main parts: one near a copy paper separation device that separates copy paper p from a photosensitive drum a, and the other in a fixing device C located above and behind the separation device. Rollers d... are provided nearby, and a perforated conveyor belt e is wound around these rollers d...
Then, in the space created by the conveyor belt e, holes f and suction 7 that repeatedly match the holes of the belt e as the belt e moves.
A case h equipped with an angle g is arranged so that the front edge of the copy paper p separated from the photosensitive drum a comes into contact with the upper roller 1 of the fixing device C via an inclined guide B1. It is configured to be suctioned and conveyed.

The above-mentioned conveyance type can increase the height of the paper ejection tray (see Figure 2) installed at the rear of the fixing device C, and is particularly useful for handling the copy paper P in a fixed-table copying machine. It has excellent advantages.

Furthermore, as is well known, by conveying the copy paper p along the inclined guide B1 and bringing the front edge of the copy paper p into contact with the upper roller j, the copy paper p is caused to hang down on the front edge side. By being introduced between the upper and lower rollers j, it is possible to prevent the copy paper p from wrinkling and to prevent image defects.

However, the above-mentioned prevention of wrinkling of the copy paper P and prevention of image defects due to starvation during transportation is limited to cases where the copy paper P is thin and weak. In addition, if the material is thick and strong, the first
As shown in the figure, when the front edge of the copy paper P comes into contact with the upper roller j, there is almost no drooping of the front edge of the copy paper, so the entry angle of the copy paper P with respect to the upper roller j, in other words, For example, the angle θ formed by the tangential surface S based on the contact line 0 between the front edge of the copy paper and the upper roller j and the top surface S1 of the copy paper becomes large, and in addition, in this state, the suction conveyance capacity is halved. Because of this, the copy paper p slips on the conveyor belt e while remaining in contact with the upper roller j.
Inconveniences such as the inability to fix the copy paper p or the occurrence of paper jams due to interference with subsequent copy paper p have occurred.

The present invention has been made in view of the above circumstances, and
Aiming to eliminate the conventional drawbacks through extremely simple structural improvements, a means for bending the conveying surface of the upper belt portion upward is provided on the lower surface side of the upper belt portion of the conveyor belt. There are characteristics.

First, embodiments of the present invention will be described based on the drawings (FIGS. 2 to 8).

FIG. 2 shows an overall schematic diagram of an electrophotographic copying machine to which a copy paper conveying device according to the present invention is applied. equipment [5, copy paper separation device 6 and cleaning device 7
A pair of rollers 10, . A belt conveying type copy paper conveying device 12 is provided to feed the copy paper to the fixing device 11, and a roller pair 14 is provided for taking out the copy paper after fixing to a tray 18.

The copy paper conveying device 12 is disposed from the copy paper separating device 6 to an inclined guide section 16 disposed near the fixing device 11, and more specifically, as shown in FIG. A driving roller 16, a driven roller 17 near the copy paper separating device 6, and a tension roller 18 near the roller 17 are arranged, respectively, and these rollers 16, 17, and 18 are provided with holes. The conveyor belt 19 is wound around the upper belt portion 19a of the conveyor belt 19, and an idling roller 2 is provided on the lower surface side of the upper belt portion 19a for making the conveyance surface of the upper belt portion 19a upwardly curved.
0 is set.

Further, a case 28 is disposed in the space formed by the conveyor belt 19, and has a suction fan 22 and holes 21 that repeatedly match the holes of the belt 19 as the conveyor belt 19 moves. The copy paper separated from the ram L is conveyed by suction, and the copy paper is brought into contact with the upper roller IIA of the fixing device 11 from the inclined guide section 15, and then is subjected to fixing processing by the upper roller IIA and the lower roller IIB. It is designed to allow

According to the above configuration, the upper and lower rollers IIA and IIB of the fixing device 11, the driving and driven rollers 16 and 17 of the copy paper conveying device 12, and the inclined guide section 15 are connected in the same manner as in the conventional system. In this arrangement, as shown in FIGS. 8 and 4, the trailing end portion of the front edge 12 of the copy sheet is slightly tilted forward.

Here, if the copy paper P to be fixed is thin and weak, as shown in FIG.
It is conveyed in a state of suction contact due to the suction action of the holes 21, and is transferred along the inclined guide portion 15, and
Its front edge touches the upper roller IIA and hangs down,
Subsequently, it will be introduced between rollers 11A and 11B.

On the other hand, if the copy paper P is thick and stiff, such as a postcard, the front edge of the copy paper P will not sag even when it comes into contact with the upper roller IIA, but the rear end will be lifted. In other words, the upper roller II
The intrusion angle θ of the copy paper P with respect to A is much smaller than in the past, and furthermore, the copy paper P is subjected to the conveyance force by the conveyor belt 19 at the corner T at the rear end, so that the conveyance action is reliable. With this and the small entry angle θ, the copy paper P can be reliably and smoothly introduced between the rollers IIA and IIB.

In addition, 24 in the figure is a guide member such as a wire, and an upper side belt portion 19 extending between the driven roller 17 and the idle roller 20.
a into the imaginary extension plane, and is provided so that when the copy paper P moves through the imaginary extension plane due to its stiffness, its front edge comes into contact with the guide member 24, and this contact By touching the front side of the copy paper P, the front side of the copy paper P is switched to a state where it is tilted forward.

Further, in the present invention, the idling roller 20 constitutes a means for upwardly curving the conveying surface of the upper belt portion. It is possible to change to

As explained above, according to the copy paper conveying device of the present invention,
By simply modifying the conveying surface of the upper part of the conveyor belt to project upward, weak copy paper can be transported in a form similar to conventional methods, and stiff copy paper can be transported by the fixing device. The plunge angle with respect to the upper roller is small, and copy paper can be smoothly introduced between the upper and lower rollers.

In particular, in the case of copy paper that is stiff and short in size, the corner conveyance mode has been adopted to ensure the conveyance action, and the introduction between the rollers becomes more reliable.

[Brief explanation of drawings]

Figure 1A shows a copy paper conveying device in a conventional electrostatographic copying machine, Figure 1A is a partially sectional side view, and Figure 1A is a partially sectional main part for explaining its operation. FIG. 2 and 8 show a copy paper conveying device in an electrostatographic copying machine according to the present invention, FIG. 2 is an overall schematic side view of the electrostatic copying machine, and FIG. It is a partial cross-sectional side view. Further, FIG. 4 is a partially sectional side view of a main part for explaining the function and effect of the copy paper conveying device according to the present invention. DESCRIPTION OF SYMBOLS 1... Photosensitive drum, 7... Copy paper separation device, 11.
...Fixing device, IIA...Upper roller, 19...Transport belt, 19a...Upper side belt portion, 20...
Bending means (idling roller, protruding guide plate). Figure 3 22 Yo9a 0

Claims (1)

[Scope of Claims] ■ Disposed near a copy paper separation device that separates copy paper from the photosensitive drum and near a fixing device located rearward and upper than the separation device, and connected to the front end of the copy paper via an inclined guide section. A belt-conveying type copy paper conveying device that conveys copy paper with its edge in contact with the upper roller of the fixing device, and the conveying surface of the upper belt portion is placed on the lower surface side of the upper belt portion of the conveyor belt in an upward direction. 1. A copy paper conveying device characterized in that it is provided with bending means for projecting the copy paper. (2) The copy paper conveying device according to claim 0, wherein the bending means is an idle roller. (2) The copy paper conveying device according to claim 0, wherein the bending means is a bending guide plate.