JPH08301501A - Discharged paper tray for image forming device - Google Patents

Abstract

PURPOSE: To improve alignment failure resulting from the curling direction of printed paper discharged from an image forming device, prevent the printed paper from jumping out from a discharged paper tray and from being jammed, improve alignment of the printed paper and alignment in the cross direction of the printed paper according to the size of the printed paper. CONSTITUTION: A steep and moderate upward slopes of two stages are established in order along the traveling direction of printed paper at the printed paper loading surface 1b of a discharged paper tray 1B, and a mountainous protruding part is formed whose slope in the cross direction of the printed paper changes from a steep one to a moderate one toward the downstream side from the upstream side along the traveling direction of the printed paper in the center of the printed paper loading surface 1b. A slidable guide member is formed in the cross direction of the printed paper onto the printed paper loading surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a paper discharge tray attached to an image forming apparatus such as a printer and a copying machine.

[0002]

2. Description of the Related Art Generally, in an image forming apparatus such as a printer and a copying machine, a discharge tray 4A for receiving printed printing paper (hereinafter referred to as "printing paper") is attached to the image forming apparatus 1A by screws or the like as shown in FIG. It is fixed. In the figure, reference numeral 1a is a printing paper discharge port. Such an output tray 4
In A, it is required that the print paper discharged from the image forming apparatus 1A has good alignment. Since the alignment of the printing paper depends on the curl direction and the strength of the waist of the printing paper stacked on the paper discharge tray 4A, conventionally, the discharge roller located at the discharge port 1a of the image forming apparatus 1A and the discharge roller are discharged. By providing a mountain-shaped protrusion near the nip point of the idler roller facing the roller, forcibly forming a rib on the printing paper, and by making an upward slope on the paper discharge tray 4A,
A method for preventing misalignment of sheets on the sheet discharge tray 4A is implemented.

[0003]

However, even if it is attempted to improve the alignment on the discharge tray by the means as described above, the former means, in association with the latter means, ejects the printed paper. However, there is a problem that the printing paper already loaded on the paper ejection tray is taken out. Further, in the latter means, when the curl of the printing paper is 3B downward with respect to the horizontal direction as shown in FIG. 3, good alignment results could be obtained. Is 3 A upward with respect to the horizontal direction, the paper ejection tray has a shape that promotes upward curling of the printing paper, which not only impairs the alignment but also causes a jam of the printing paper that is difficult to collect. was there. Further, in the case of the conventional paper ejection tray, there is no particular consideration for the alignment of the printing paper in the direction perpendicular to the traveling direction of the printing paper, and there is a problem that the paper is misaligned.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper discharge tray which improves the alignment of printing paper discharged from an image forming apparatus in view of the above problems of the paper discharge tray.

[0005]

Means for Solving the Problems The above-mentioned problem is to set an upward gradient on a printing paper stacking surface of a discharge tray along the traveling direction of the printing paper in two steps, that is, in order. At the center, a mountain-shaped protrusion that changes from a steep slope to a gentle slope in the width direction of the printing paper is provided from the upstream side to the downstream side along the traveling direction of the printing paper. The solution is to provide a guide member that is slidable in any direction.

[0006]

According to the paper discharge tray of the image forming apparatus of the present invention,
It is possible to correct the curl of the printing paper discharged from the image forming device, prevent the printing paper from jumping out from the paper discharge tray, falling, and jamming on the printing paper stacking surface, and improve the alignment of the printing paper. It becomes possible to measure. further,
It is possible to improve the alignment in the width direction of the printing paper.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the overall configuration of the image forming apparatus. In the figure, a paper discharge tray 1B is provided near the print paper discharge port 1a of the image forming apparatus 1A. This paper discharge tray 1B is
In order to prevent the printing paper from falling, the printing paper is formed with a slight upward slope along the traveling direction X of the printing paper, and the image forming apparatus 1A is fixed by fitting the end portion on the printing paper discharge port 1a side with a screw or the like.

As shown in FIG. 2, the gradient of the printing paper stacking surface 1b of the paper discharge tray 1B is set in a two-step manner in which the upward gradient from the fixing portion 2A to the image forming apparatus 1A along the traveling direction X is suddenly increased. It has upward angles 2a and 2b with respect to the horizontal direction. Regarding the values of the two stages of angles 2a and 2b which are planes, the angle 2a is set to 20 ° to 30 ° and the angle 2b is set to 5 ° to 15 °. Further, in the central portion on the printing paper stacking surface 1b of the discharge tray 1B, a mountain range shape in which the printing paper width direction gradient changes from a steep slope to a gentle slope from the upstream side to the downstream side along the traveling direction of the printing paper. Projection 1c
Is provided. The central portion of the mountain-shaped protruding portion 1c is raised along the traveling direction X of the printing paper, and the angle formed by the raised ridge line and the horizontal direction is set to 20 ° to 30 ° as shown by the angle 2c in FIG. Has been done. Further, the height 2d of the downstream end portion of the protruding portion 1c in the printing paper traveling direction with respect to the printing paper stacking surface 1b is preferably about 20 mm. Further, print sheet abutting members 1d and 1e are provided on both sides of the discharge tray 1B in the print sheet width direction, and the print sheet abutting members 1d and 1e are slidably provided according to the print sheet size. There is.

Since this embodiment has the above structure,
As shown in FIG. 3, when the paper curl direction of the print paper is the upward curl 3A, it is corrected downward by the two-step gradient angles 2a and 2b of the discharge tray 1B, and as a result, the print paper is stacked. The shape of the printing paper stacked on the surface 1B is stabilized, and the alignment of the printing paper is significantly improved. On the other hand, as shown in FIG. 3, when the paper curl direction is the downward curl 3B, the gradient in the print paper width direction is steep from the upstream side to the downstream side along the traveling direction of the print paper in the central portion on the print paper stacking surface 1B. The downward curl 3B is corrected by providing the mountain-shaped protruding portion 1c that changes from a gradient to a gentle gradient, and the alignment of the printing paper is remarkably improved in the same manner as described above.

Further, as shown in FIG. 1, since the guide members 1d and 1e slidable in the printing paper width direction are provided on the printing paper stacking surface 1B, the alignment property in the printing paper width direction is further improved according to the size of the printing paper. .

[0011]

As described above, according to the first aspect of the present invention, the upward gradient is set in two stages in the printing paper stacking surface of the discharge tray along the traveling direction of the printing paper in order, and At the center of the printing paper stacking surface, a mountain range-like protrusion that changes the gradient in the width direction of the printing paper from a steep slope to a gentle slope is provided from the upstream side to the downstream side along the traveling direction of the printing paper. Even the deformed printing paper can be satisfactorily corrected on the printing paper stacking surface of the paper ejection tray, and the alignment in the traveling direction of the printing paper can be significantly improved.

According to the second aspect of the invention, in addition to this, since the guide member slidable in the width direction of the printing paper is provided on the printing paper stacking surface of the discharge tray, the printing paper width can be changed according to the size of the printing paper. The directional alignment can also be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a paper discharge tray according to the present invention.

FIG. 2 is a side view showing a main part of the paper discharge tray shown in FIG.

FIG. 3 is a side view showing a curled state of a print sheet discharged from the image forming apparatus on a sheet discharge tray.

FIG. 4 is a perspective view showing a discharge tray of a conventional image forming apparatus.

[Explanation of symbols]

1A is an image forming apparatus, 1B is a paper ejection tray, 1b is a printing paper stacking surface, 1c is a mountain-shaped projecting portion, 1d and 1e are guide members, 2a and 2b are inclination angles of the printing paper stacking surface, and 2c is a projecting portion. Is the gradient angle of.

Continued Front Page (72) Inventor Yasushi Hashimoto 1060 Takeda, Hitachinaka City, Ibaraki Prefecture Hitachi Koki Co., Ltd.

Claims (2)

[Claims] 1. A discharge tray for aligning printed print sheets of an image forming apparatus such as a printer or a copying machine without unevenness, the print sheet stacking surface of the discharge tray along the traveling direction of the print sheets. The gradient of the upward direction is set in two steps in order, and in the center of the printing paper stacking surface, the gradient in the width direction of the printing paper is increased from the upstream side to the downstream side along the traveling direction of the printing paper. A paper discharge tray for an image forming apparatus, which is provided with a mountain-shaped projecting portion that changes in a horizontal direction. 2. A paper discharge tray of an image forming apparatus according to claim 1, wherein a guide member slidable in a print paper width direction is provided on a print paper stacking surface of said paper discharge tray.