JPH10152255A - Paper loading tray and paper ejection device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively straighten the curl of paper so as to stack paper stably by extending a protruding part in the cross direction of a tray base at the upper face center part of the tray base, and providing wing members at both side tray base parts of the protruding part through elastic members. SOLUTION: A paper stacking tray 1 is composed of a tray base 2, a protruding part 3 extended in the cross direction of the tray base 2 (a vertical direction to a paper face) at the upper face center part of the tray base 2, wing members 5 provided at both side tray base parts of the protruding part 3 through elastic members (coil springs) 4. The protruding part 3 is so formed as to have a paper holding face 3a for holding stacked paper 6. The coil springs are adjusted in such a way as to straighten the curl of paper appropriately by the ratio of the area of paper, the area of the paper holding face and the paper contact area of the wing members 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper stack tray and a paper discharge device using the same.

[0002]

2. Description of the Related Art As one form of a paper discharge device, there is a device in which sheets sent one by one from a host device are sequentially stacked on a sheet stack tray.

[0003]

By the way, in this type of paper discharging device, when paper is discharged to a paper stacking tray having a flat upper surface, for example, if the paper is curled,
Paper cannot be correctly stacked at a predetermined position. For example, when the upper device is a printer or the like having a fixing device of a heating and pressing roller type, the curling of the sheet may be caused by the heating and pressing action. Then, if the curled sheets are continuously stacked, not only the improper stacking but also other obstacles such as a paper jam may be caused.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned drawbacks of the prior art, to effectively correct curl of a sheet, and to stably load a sheet, and to provide a sheet loading tray and a sheet discharging apparatus using the same. To provide.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper loading tray comprising: a tray base; a projection extending in the width direction of the tray base at the center of the upper surface of the tray base; This is attained by forming a wing-shaped member provided on a portion through an elastic member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in the figure, a paper loading tray 1 has a tray base 2 and a projecting portion extending in the width direction of the tray base 2 (perpendicular to the plane of the drawing) at the center of the upper surface of the tray base 2. 3 and a wing-like member 5 provided on a tray base portion on both sides of the protrusion 3 via an elastic member (coil spring) 4.

In this embodiment, the protruding portion 3 is formed to have a sheet holding surface 3a for holding the stacked sheets 6. Further, the coil spring 4 is adjusted so as to properly correct the curl of the sheet based on the area of the sheet, the area of the sheet holding surface 3a, and the ratio of the area where the wing member 5 contacts the sheet.

Further, above the sheet stacking tray 1, sheet carrying members (paddles) 8, 9 for carrying sheets sent out one by one from a transport roller 7 of a higher-level device such as a printer onto the sheet stacking tray 1. The sheet is held rotatably, and the position of the leading end of the sheet carried in by the paddles 8 and 9 is regulated by the guide member 10.

Further, the paper stacking tray 1 is moved through an elevating table 11 supported by the elevating mechanism so as to be able to move down / up.
The paddles 8 and 9 and the guide member 10 are provided so as to be able to move down / up.

According to the paper discharging apparatus having the above-described structure, when the amount of loaded paper is small, the force acting on the coil spring 4 is small, so that the amount of descending of the wing member 5 is small, and the paper is loaded substantially horizontally. Further, as shown in FIG. 2, when the stacking amount of the sheets is large, the force acting on the coil spring 4 is large, so that the descending amount of the wing member 5 is large, and the curl correcting ability is large.

The curl of a sheet has a characteristic that the property becomes remarkable as the stacking amount increases. This is because when the amount of loaded paper is small, the deformation due to its own weight is more dominant than the rigidity of the paper, whereas when the loaded amount of paper is large, the rigidity of the entire paper is more dominant than the deformation due to its own weight. That's why. For example, if one sheet is placed on a horizontal object, the sheet is stored in a nearly horizontal shape, and if placed on a curved object, the sheet is stored in a shape along a curved surface. . On the other hand, in the case of stacked stacked sheets having a certain thickness, the rigidity of the whole is increased, and the property of following the surface shape of the placement place is weakened.

In order to correct the curl in consideration of the above-mentioned properties, the sheets are stacked in a horizontal state during a period in which the amount of stacked sheets is small.
It can be seen that as the stacking amount increases, the direction in which the curl is corrected, that is, both ends of the stacked paper should be lowered.

The dimensions of the members constituting the sheet stacking tray 1 and the elastic force of the coil spring 4 are determined by the type of sheet to be used, the maximum stacking amount of sheets, the printing pattern of a printer connected to the sheet discharging device, and the like. Optimal conditions are set based on the parameters.

[0015]

As described above, according to the present invention, it is possible to provide a sheet stacking tray capable of effectively correcting the curl of a sheet and stably stacking the sheet, and a sheet discharging apparatus using the tray. it can.

[Brief description of the drawings]

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

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

[Explanation of symbols]

1 ... paper loading tray, 2 ... tray base, 3 ... protrusion,
4 ... elastic member (coil spring), 5 ... wing member, 6 ... paper, 7 ... conveying roller, 8, 9 ... paper carrying member (paddle), 10 ... guide member, 11 ... elevator.

Claims (2)

[Claims] 1. A tray base, a projecting portion extending in the width direction of the tray base at the center of the upper surface of the tray base, and a wing-like member provided on a tray base portion on both sides of the projecting portion via an elastic member. A paper loading tray, comprising: 2. A tray base, a protruding portion extending in the width direction of the tray base at the center of the upper surface of the tray base, and a wing-like member provided on a tray base portion on both sides of the protruding portion via an elastic member. A paper loading tray, a paper carrying member held above the paper loading tray, a guide member for regulating the position of the paper carried by the paper carrying member, and a paper carrying member for the paper carrying member and the guide member. A sheet discharging device comprising: a lifting mechanism for lowering / lifting a loading tray.