JP2717801B2 - Paper ejection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper discharge device for discharging and stacking paper conveyed from a device such as a copying machine or a printing machine to a paper discharge tray by a discharge roller. is there.

(Prior Art) FIG. 5 shows a state of sheet discharge in a conventional sheet discharging device, and FIG. 6 shows a state of sheet stacking in a conventional sheet discharging device. The conveyed sheet 1 is discharged to a discharge tray 3 by a discharge roller 2,
Even if the sheets 1 having different dimensions are alternately discharged in the stacking sheet discharging device, the stacking of the sheets 1 is not hindered.
In recent years, in order to stack the paper 1 with the rear end surfaces aligned, the paper discharge tray 3 in which the front is higher in the paper discharge direction than the rear has been frequently used.

(Problems to be Solved by the Invention) However, if the paper 1 to be discharged is curled, long, thin, or stiff, the leading edge of the paper 1 discharged by the discharge roller 2 Is
Before coming into contact with the paper discharge tray 3, the paper is rolled or buckled by its own weight, and moves upward beyond the paper discharge tray 3, while still contacting the inclined surface of the paper discharge tray 3 (see FIG. 5). Disappears. As a result, the paper 1 is rolled up and stacked in the paper discharge tray 3 (see FIG. 6), and thereafter, the rear ends of the paper 1 discharged by the discharge roller 2 cannot be aligned and stacked. Also, there is a problem that the paper 1 is removed outside the paper discharge tray 3.

Therefore, conventionally, by providing rollers having different outer diameters adjacent to each other, the sheet 1 is bent in a direction perpendicular to the sheet discharging direction, and the sheet 1 is bent, so that the leading end of the sheet 1 is discharged. Before contacting the paper tray 3, the paper 1 was prevented from curling or buckling under its own weight. However, if the outer diameter difference of the rollers was large, the paper 1 would stick, but the image on the paper 1 would not be damaged. If the difference between the outer diameters of the rollers is small, it becomes difficult for the paper 1 to stick, and the paper 1 may be curled before the leading edge of the paper 1 contacts the paper output tray 3. However, there is a problem that the paper 1 curls into the paper discharge tray 3 and is stacked by buckling due to its own weight.

The present invention, the paper to be discharged is rounded, long, or weak, even if the thickness is thin, etc.
It is an object of the present invention to provide a paper discharge device capable of stacking paper sheets with their rear end surfaces aligned without damaging an image on the paper sheets.

(Means for Solving the Problems) According to the present invention, a sheet is bent downward by a discharge roller,
In addition, one or a plurality of fillers press the bent bottom portion of the sheet discharged from the discharge roller downward at a predetermined pressure by one or a plurality of fillers in the sheet discharging direction, and discharge the sheet while further strengthening the sheet. In a paper discharge device that discharges and stacks paper onto a tray, the paper discharge tray is connected to a filler, and when it is detected that the filler is constantly raised to a predetermined height by the paper discharged and stacked on the paper discharge tray, the paper discharge tray is moved to a paper A full state detecting means for determining that the state is full.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In FIGS. 1 to 4, the same reference numerals indicate the same parts.

FIGS. 1 to 3 show the structure of an embodiment of the present invention. Reference numeral 4 denotes a guide plate for guiding a sheet 5 conveyed from a device such as a copying machine or a printing machine to a discharge port (not shown). , 6
Is a drive shaft provided with a plurality of rollers 7 of the same diameter so as to be equidistant from the center of the discharge area of the paper 5 (hereinafter referred to as the center of the paper discharge area), that is, symmetrical in the paper discharge area. A plurality of small-diameter rollers 9 having a plurality of non-slip irregularities for contacting the rollers 7 so as to be equidistant from the center of the paper discharge area, that is, symmetrical in the paper discharge area.
A moving shaft 11 rotatably provided with a pair of disc-shaped large-diameter rollers 10 adjacent to the driving shaft 6, a driving shaft 6 driven to rotate in synchronization with the transport timing of the sheet 5, a moving shaft 8, A discharge roller 12 having a moving shaft 8 movably supported in the vertical direction so as to be urged downward by the weight of the small-diameter roller 9 and the large-diameter roller 10, and a discharge roller 12. A discharge tray 13 in which a receiving plate 12b is inclined upward and forward so that the front is higher than the rear in the paper discharge direction from the lower end;
Is a filler provided with a front end 13a curved upward so as to make the contact with the paper 5 smooth, at the center of the paper discharge area on the upper part of the paper discharge tray 12 so as to be vertically swingable. The rotating shaft 15 has a filler 13 fixed to one end, 15 is full state detecting means attached to the other end of the rotating shaft 14, and the full state detecting means 15 has a tip 13a suspended above the discharge tray 12. Even if the sheet 5 is lifted on the sheet 5 discharged from the discharge roller 11, the sheet 5 in the sheet discharge tray 12 is not immediately determined to be full, and the sheet 5 in the sheet discharge tray 12 is 5 is set to detect that it is full.

In the present embodiment thus configured, when the paper 5 is guided by the guide plate 4, the discharge roller 11 holds the paper 5 between the roller 7 and the small-diameter roller 9, and discharges the paper 5 from the paper 5. The central portion of the area is bent downward by the roller 7 and the large-diameter roller 10, and the bent top 5 a of the paper 5 is placed between the two large-diameter rollers 10 at the portion sandwiched between the roller 7 and the small-diameter roller 9. By forming the bent bottom portion 5b of the paper 5 and forming two bending habits in the paper discharge direction, the paper 5 is moved in the paper discharge direction (first
2 and FIG. 2).

When the bent bottom 5b of the paper 5 hits the filler 13, the filler 13 is lifted upward by the paper 5 and placed on the paper 5, so that the weight of the filler 13 is reduced.
The paper 5 further flexes over the central portion of the paper 5 and the stiffness of the paper 5 further increases. Therefore, even if the paper 5 is curled, long, stiff, thin, or the like, before the leading edge of the paper 5 contacts the receiving plate 12b of the paper discharge tray 12, the paper 5 Does not curl or buckle in the paper discharge direction, so that the paper 5 hardly hits the receiving plate 12b whose tip is inclined forward and the paper 5 hits the receiving plate 12b whose tip is inclined forward. However, the slope of the receiving plate 12b is smoothly moved upward as it is.

As a result, when the paper 5 is completely discharged from the discharge roller 11 and the paper 5 falls on the receiving plate 12b, the paper 5 slides backward in the paper discharge direction and comes into contact with the abutment plate 12a. The sheets 5 are stacked on the sheet discharge tray 12 in the aligned state. At the same time, the filler 13 also swings and is suspended at a predetermined position on the paper discharge tray 12.

Thereafter, by repeating the above-described operation, the paper 5
Are sequentially stacked with the rear end surfaces thereof aligned on the paper discharge tray 12, and when the paper 5 stacked on the paper discharge tray 12 is almost full, the leading end 13 of the filler 13 suspended at a predetermined position is
When the paper 5 comes into contact with the sheet a and starts lifting the filler 13 upward, and when the leading end 13a of the filler 13 is lifted to a predetermined height, the user is warned that the paper output tray 12 is full. Or the conveyance of the paper 5 is stopped.

By the way, the two large-diameter rollers 10 are respectively provided on the left and right from the center of the sheet discharge area of the conveyed paper 5 by a, and the roller 7 and the large-diameter roller 10 are located between the inner end faces thereof. Although they are provided apart from each other, if the interval l is increased, the bending habit attached to the paper 5 is weakened, and if the interval l is reduced, the bending habit is increased. Also, if the outer diameter difference between the small-diameter roller 9 and the large-diameter roller 10 is reduced, the bending habit attached to the paper 5 is weakened. Becomes stronger.

However, if the bending habit is increased, the curl of the paper 5 in the direction perpendicular to the paper discharge direction increases, and the number of sheets 5 that can be stacked on the discharge tray 12 decreases, or the paper 5 and the large-diameter roller 10 As a result, the image on the sheet 5 is easily scratched.

Therefore, in the present embodiment, the interval l and the outer diameter difference between the small-diameter roller 9 and the large-diameter roller 10 are set so that the paper 5 has such a bending tendency that the image of the paper 5 is not damaged. The strength of the waist, which is insufficient only by the bending habit, in other words, the strength of the waist of the paper 5 required until the leading end of the paper 5 contacts the receiving plate 12b, It is supplemented by being further bent on the bottom 5b.

Note that if the distance a between the large-diameter roller 10 and the filler 13 is too small, the above-described effect is diminished. Therefore, the positional relationship must be at least a> l.

FIG. 4 shows the configuration of another embodiment of the present invention.
The two fillers 13 are disposed equidistant from the center of the paper discharge area, that is, symmetrical in the paper discharge area, and the rotation axis 14 of one of the fillers 13 is filled with a full state detecting means.
This embodiment has the same function as the above-described embodiment.

Further, in this embodiment, an example in which two fillers 13 are used has been described. However, more fillers may be provided as necessary, and at that time, one of the fillers 13 is detected as being full. Means 15 may be attached.

In the two embodiments, an example in which the receiving plate 12b is inclined has been described. However, the receiving plate is horizontal so that the front and the rear are at the same height in the sheet discharging direction, or the front is A paper discharge tray may be inclined forward or downward so as to be lower than the rear.

(Effects of the Invention) As described above, according to the present invention, the sheet is bent downward by the discharge roller, and the bent bottom portion of the sheet is pressed at a predetermined pressure downstream of the sheet discharge direction by one or a plurality of fillers. By pressing the sheet downward to deflect the sheet further, it is possible to add the necessary stiffness of the sheet until the leading edge of the sheet to be ejected contacts the sheet ejection tray.
Even if the discharged paper is rounded, long, thin, thin, or the like, the paper can be stacked on the paper discharge tray with the end faces of the papers aligned.

In addition, by using one or a plurality of fillers as a detector for detecting the weight of paper and the amount of paper loaded, there is an effect that the configuration of the paper discharge device is simplified and the manufacturing cost is reduced.

[Brief description of the drawings]

1 is a side view of one embodiment of the present invention, FIG. 2 is a perspective view of one embodiment of the present invention, FIG. 3 is a front view of one embodiment of the present invention, and FIG. FIG. 5 is a perspective view of the embodiment of FIG.
FIG. 1 is a diagram showing a state in which sheets are stacked in a conventional sheet discharging device. 5 ... paper, 5a ... flexible top, 5b ... flexible bottom, 6 ...
Driving shaft, 7 Roller, 8 Moving shaft, 9 Small roller,
10 large-diameter roller, 11 discharge roller, 12 discharge tray, 13 filler, 15 full-state detecting means.

Claims (1)

(57) [Claims] 1. A sheet is bent downward by a discharge roller,
Further, the bottom of the bent sheet of paper discharged from the discharge roller is pressed downward at a predetermined pressure by one or a plurality of fillers on the downstream side in the paper discharge direction, and while the paper is further stiffened, In a sheet discharging device for discharging and stacking sheets on a sheet discharge tray, it is connected to the filler, and the filler is constantly raised to a predetermined height by the sheets discharged and stacked on the sheet discharge tray. A paper discharge device, comprising: a full state detection unit that, when detected, determines that the paper discharge tray is full of the paper.