JPH09315651A - Paper discharging device for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of a scar to paper by differentiating the diameters of a plurality of discharge rollers fitted to a discharge roller shaft. SOLUTION: The diameters of discharge rollers 3b are small, and the height of discharged paper 2 to a stacker 5 is higher on the outside than on the inside. The paper 2 is thereby placed in a U-shape bent state to impart stiffness to the paper 2. The paper 2 is therefore fed floating without coming in contact with the stacker 5 up to a position far from discharge rollers 3a, 3b and lands on the stacker 5. The discharged paper 2 is stacked orderly on the stacker 5. On the contrary, the diameters of the discharage rollers 3a can be made small, or discharge rollers with different diameters can be alternately arranged. With this constitution, the effect of reducing the number of part items and not generating a scar is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper ejecting apparatus for a printing apparatus, and more particularly to a paper ejecting apparatus for a printing apparatus such as a printer, a facsimile, a copier, etc., which uses an electrophotographic process.

[0002]

2. Description of the Related Art A paper discharge device of a conventional printing device will be described in detail with reference to the drawings.

FIG. 4 is a side view showing a conventional example. The paper discharge device of the printing apparatus shown in FIG. 4 includes a plurality of discharge rollers 3 attached to a discharge roller shaft (not shown), a plurality of auxiliary rollers for pressing the paper 2 against the discharge roller 3, and a concave portion at the center of the paper 2. And a Mylar plate 20 (see, for example, Japanese Patent Laid-Open No. 4-164777).

FIG. 5 is a perspective view showing a conventional use example. The mylar plate 20 is an elastic body, so that the sheet 2 to which the waist is attached bends back upward, its leading end does not hang down, is sent from the discharge roller 3 to a position far away, and is piled up orderly on the stacker 5. To be done. The scratches 21 are linear scratches on the paper 2 that occur when the Mylar plate 20 ejects the paper 2 while applying force.

[0005]

However, the above-described conventional paper discharge device of the printing device has a drawback that scratches are generated on the paper. If the surface on which the scratches are generated is the printed surface, the print quality will deteriorate. Further, since the Mylar plate is required, there is a problem that the number of parts is increased.

[0006]

In the paper discharge device of the printing apparatus of the present invention, the diameters of the plurality of discharge rollers attached to the discharge roller shaft are made different.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings.

1 and 2 are a perspective view and a side view showing an embodiment of the present invention. The paper discharge device of the printing apparatus shown in FIG. 1 corresponds to two discharge rollers 3a having a large diameter attached to a discharge roller shaft 30, two discharge rollers 3b having a small diameter, and discharge rollers 3a and 3b. It is configured to include four auxiliary rollers 4 provided as described above. FIG.
FIG. 4 is a front view showing an example of use of the present invention. Discharge roller 3
Since the diameter of b is small, the stacker 5 for ejected sheets 2
The outer side of the sheet 2 is higher than the inner side of the sheet, and the sheet 2 is bent in a U shape, so that the sheet 2 is elastic. Therefore, the sheet 2 is sent to a position far away from the discharge rollers 3a and 3b while being floated without contacting the stacker 5 and can be landed on the stacker 5, so that the discharged sheet 2 is loaded on the stacker 5 in an orderly manner. To be done.

Contrary to FIG. 1, the diameter of the discharge roller 3a may be smaller than that of the discharge roller 3b. Further, the same effect can be obtained by arranging discharge rollers having different diameters alternately.

Since soft rubber is used as the material of the discharge roller and the auxiliary roller, no scratches are left on the paper or printing.

[0011]

In the paper discharge device of the printing apparatus of the present invention, since the paper is stiffened by making the diameters of the plurality of discharge rollers different from each other, no scratches are generated and the number of parts can be reduced. There is.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a front view showing an example of use of the present invention.

FIG. 4 is a side view showing a conventional example.

FIG. 5 is a perspective view showing a conventional usage example.

[Explanation of symbols]

 1 Printer 2 Paper 3a, 3b Discharge Roller 4 Auxiliary Roller 5 Stacker 20 Mylar Plate 21 Scars 30 Discharge Roller Shaft

Claims (4)

[Claims] 1. A paper discharge device for a printing apparatus, wherein a plurality of discharge rollers attached to a discharge roller shaft have different diameters. 2. The paper discharge device of a printing apparatus according to claim 1, wherein the diameter of the discharge roller attached outside the discharge roller shaft is larger than the diameter of the discharge roller attached inside. 3. The paper discharge device of a printing apparatus according to claim 1, wherein the diameter of the discharge roller attached outside the discharge roller shaft is smaller than the diameter of the discharge roller attached inside. 4. The paper discharge device of a printing apparatus according to claim 1, wherein the diameters of a plurality of discharge rollers attached to the discharge roller shaft are alternately increased and decreased.