JPS59182155A - Sheet loading apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet stacking device used in an image forming apparatus such as a laser beam printer or a copying machine. In particular, the present invention relates to a sheet stacking device having a function of aligning sheets.

Hereinafter, a sheet stacking device used in a laser beam printer will be described as an example.

2. Description of the Related Art Conventionally, in a device such as a laser beam printer that uses a large amount of paper, it is necessary that the outputted paper be well aligned, and sheet stacking devices having an alignment function for this purpose have been proposed.

However, with conventional alignment devices, when aligning with paddles,
The paper could sometimes fly out, disrupting the rows of banknotes. In particular, poems with curled paper tended to have poor alignment.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a sheet stacking apparatus that solves the problems of the conventional apparatus described above and can properly align stacked sheets even if the sheets are curled.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a sheet stacking device using an embodiment of the present invention, in which a good banknote row is realized by providing a pressing plate that presses the trailing edge of paper sheets. Further, FIG. 2 is a front view thereof, and FIG. 3 is a side view of the vicinity of the pressing plate.

In the figure, reference numerals 1 and 2 denote a pair of paper ejecting rollers, which rotate in the direction of arrow a and feed the paper 9 ejected from the main body of the printer (not shown) into the aligning device -5. The guide members 6 are provided perpendicularly to each other, and contact the two sides of the paper 9 in the discharge direction, the leading end and the negative end thereof, to determine the stacking position of the paper 9. Here, the width of the guide members 5 and 6 is
The corner 9a of the stacked paper 9 is smaller than the width of the side edge of the paper 9.
does not come into contact with the guide members 5 and 6. A paddle 3 has four blades 3b each made of an elastic material 3a such as conductive rubber (volume resistivity: 10 MΩcm), and rotates in the direction indicated by the arrow when driven by a motor 4. Note that this paddle 3 is installed so that its axis 3c is inclined at about 45 degrees with respect to the guide member 5. Therefore, the paddle 3 has its blade 3b
comes into contact with the highest stacked paper 9, and due to the frictional force,
The paper 9 is pulled toward the intermediate portion S of the guides 5 and 6. Note that 7 is a loading table for the paper 9, and 8 is an A lowering mechanism of the loading table 7 for keeping the upper surface of the sheet 9 constant at all times.

Furthermore, lO is an eccentric cam that is coaxial with the lower paper ejection roller 2.
It is sandwiched between the rollers 2 at the top and fixedly attached to the shaft 2a. Reference numeral 11 denotes a suppressing member having elasticity in the form of a leaf spring, which abuts against the cam 10 and has one end attached to the stay 12, and the other end moves along the chain double-dashed line in the figure according to the amount of eccentricity caused by the rotation of the eccentric cam 10. It repeatedly swings back and forth (direction B in the figure) as shown in FIG.

With the configuration described above, the paper 9 ejected from the main body of the printer (not shown) and entered into the stacking device C is first pressed against the guide 5 and the fist 6 by the rotation of the paddle 3 and positioned. Even if the suppression plate 11 is insufficient
The trailing edge 9 of the paper is
Press a to ensure that the sheets are aligned on the loading table 7''.

That is, in this embodiment, the sheets 9 are aligned and stacked at the correct position on the stacking table 7 by the cooperation of the rotating paddle 3 and the swinging press plate 11.

In addition, sufficient effects were confirmed when the amount of rocking B of the press plate 11 was approximately 2 to 3+ nm. Further, the suppression plate 11 was constructed of a stainless steel leaf spring with a thickness of about 0.1 mm. A similar effect can be obtained by constructing this with a rigid pressing plate, but if it is manufactured with a leaf spring as shown in this embodiment, the paper can be repeatedly pressed with a very simple structure.

In the configuration described above, an experiment was conducted under the following conditions.
The sheets were stacked in good alignment on the stacking table 7''.

9 Paper feed speed approximately 500IIIIl/sec
Discharge roller (1-2) diameter 20mm ◆ Paddle (3
) Rotation speed 25 Orpm output roller rotation speed
480 rpH - Number of oscillations of press plate 11 48 Or
In this embodiment, the paddle 3 as a displacement means is arranged at an angle of about 45 degrees with respect to the paper traveling direction, but the paddle 3 does not necessarily need to be arranged at an angle, and has the function of pressing the paper toward the guide member. It is sufficient to have the following. Further, the displacement means is not limited to the paddle, but may be a friction plate that repeats parallel motion, for example. Further, in the above-mentioned embodiment, the paddle 3 and the pressing plate 11 are arranged approximately diagonally with respect to the sheet, but the arrangement is not necessarily limited to this. Of course, there are ways to face each other. Further, the present invention is not limited to a configuration in which the suppressing member presses the rear end of the sheet, and may be such that the suppressing member presses the side edge, corner, or top surface of the sheet, for example. Further, the sheet is not limited to paper, and may be made of plastic, a thin metal plate, or the like. Further, the pressing member is not limited to a flexible plate, and may be, for example, a reciprocating rod or a rotating roller.

As described above, the present invention provides a sheet stacking device that can very well align the sheets by providing a suppressing member that presses the sheets.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a sheet stacking device to which an embodiment of the present invention is applied, FIG. 2 is a front view thereof, and FIG. 3 is a side view of essential parts. In the figure, ■.2 is a paper ejection roller, 3 is a paddle, 1O is an eccentric cam, and 11 is a suppression plate.

Claims (1)

[Claims] (1) a sheet loading table, a guide member for positioning the sheet on the sheet loading table, a displacement means for applying a force to the sheet in the direction of the guide member, and provided opposite to the displacement means; A sheet stacking device comprising: a pressing member that presses a sheet on a sheet stacking table;