JPH0761683A - Paper sheet loading device and image recording device - Google Patents

Abstract

PURPOSE:To prevent the reversing or scattering of the discharged paper sheets by providing a plurality of ruggedness on the surface of a braking member when the discharged paper sheets are braked by the braking member and loaded. CONSTITUTION:In order to load the discharged originals according to the size and position of the originals whose image is recorded, a loading device 1 is constituted to move the position of a braking member 2 in the longitudinal direction or in the right-to-left direction, and the braking member 2 is mounted on a slider 3. The slider 3 can be moved in the longitudinal direction with a center rail 4 as a guide. File-shaped grooves 2a are engraved in the braking member 2 horizontally approximately over the whole area, forming a plurality of ruggedness. This constitution allows the paper sheets to be abutted on the braking member at a constantly appropriate angle irrespective of the size of the paper sheets, preventing the reversing or scattering of the paper sheets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet stacking apparatus and an image recording apparatus for storing a large number of sheets such as originals or recording sheets.

[0002]

2. Description of the Related Art In a slit exposure type image recording apparatus (rotary camera) or the like, a document is generally slit-exposed in the process of being conveyed, and a document is formed by an imaging lens provided in an optical path connecting a document surface and a film surface. Documents are photographed and recorded one after another while projecting the document images on the film fed in synchronism with the transport speed of the document.

FIG. 12 shows a paper conveyance path of the image recording apparatus. 101 is a stacking device, 102 is a braking member of the stacking device 101, 111 is an image recording apparatus main body, 112 is a paper feed port, 1
13 is a paper discharge port, 119 is a paper feed separation roller, 120 is a paper feed path switching guide, 121 is a paper detection sensor, 122 is an illumination lamp, 123 is flat glass, 124 is a reflection mirror,
Reference numeral 125 is a discharge driving roller, 126 is a manual feed guide plate, 1
Reference numeral 27 represents a conveyor belt, and 128 represents a paper discharge driven roller.

Documents bundled and set in the paper feed port 112 are fed one by one into the image recording apparatus 111 by paper feed / separation rollers 119 which rotate in opposite directions. The paper detection sensor 121 detects that the document has been conveyed, and operates so that an image recording process (not shown) is synchronized with the document. Further, the original is sent to the image projection area by the conveyor belt 127. The two illumination lamps 122 simultaneously illuminate the front side and the front side of the original passing through the gap of the flat glass 123, and simultaneously connect the image of the original to the film surface (not shown) by the reflection mirror 124 and the imaging lens (not shown). Further, the original is sent by the transport belt 127 and the discharge roller 12
5, 128 is discharged to the outside of the recording apparatus main body 111. The ejected document is a braking member 102 of the stacking device 101.
Then, it is decelerated abruptly and sequentially loaded on the loading device 101.

FIG. 11 is a perspective view of a conventional stacking device as seen from the sheet discharge side of the image recording device. 101 is a loading device, 1
Reference numeral 02 represents a braking member of the stacking apparatus 101, 103 represents a slider, 103a represents a ground contact, and 106 represents a guide base.

The stacking device 101 can move the position of the braking member 102 back and forth and left and right in order to stack the discharged sheets in good alignment in accordance with the size and position of the document to be image-recorded.

The braking member 102 is attached to a slider 103, and the slider 103 can be moved back and forth by using the inside of the bend of the guide base 106 as a guide. Further, in FIG. 11, there is a rail for left and right movement in a shaded position, and the guide base 106 can be moved left and right. The braking member 102 is made of a conductive material and is grounded to the main body of the image recording apparatus through the ground contact 103a of the slider and the guide base 106.

By the way, the image recording apparatus is equipped with an automatic paper feeder and can continuously photograph 100 to 500 originals at a time in a time of about 20 seconds to 1 minute and a half. Are known.

With the improvement of the sensitivity of the photoconductor (film), the brightness of the light source, and the development of a brighter lens, the photographing speed is increasing.

The same applies to the stacking of paper sheets discharged from the main body of the copying machine or printer.

[0011]

An image recording apparatus (rotary camera) will be described as an example.

The conventional image recording apparatus is provided with a braking member 102 for rapidly reducing the speed of the sheets in order to compactly load the sheets discharged at a high speed in a compact manner.

More specifically, a "vertical" wall is provided at a position corresponding to the size of the paper, and the discharged paper collides with the discharged paper at high speed.

However, when the processing capability of the image recording apparatus is increased to increase the sheet discharge speed and increase the stacking capacity, there arises a problem that the alignment of the discharged sheets deteriorates. In other words, the order of originals after shooting is changed, and the discharged originals are turned over, bent, and scattered.

FIG. 13 is an enlarged view of the paper discharge unit and the stacking device of the image recording apparatus, and the behavior of the discharged paper sheets will be described.

Paper ejection drive roller 125 and paper ejection driven roller 1
The tangent lines 28 shared by each other are slightly downward from the horizontal, and the original discharge direction of the original document is the angle α shown in FIG. Then, the document strikes the braking member 102 while drawing a parabola. At this time, frictional resistance occurs on the surface of the braking member 102 depending on the angle θ formed by the original with respect to the direction perpendicular to the braking member 102, the discharge speed and the weight. When the frictional resistance is larger than the gravity acting on the document, the document draws a locus as shown in FIG. 13 and is sequentially stacked on the stacking device 101.

However, there may be a case where θ becomes large depending on how the air resistance is received due to the discharged state or the quality of the paper, or when the friction coefficient of the document is small, the friction resistance does not become sufficiently large. Moreover, when the document hits the braking member 102, the velocity vertical vector component is directed downward, and the leading end of the document is further moved downward due to the resultant force of gravity. The velocity horizontal vector component becomes a frictional force by multiplying it by a friction coefficient, but as θ increases, the ratio decreases, and the force acting on the leading edge of the document becomes larger as the sheet discharging speed increases. Then, the leading edge of the document slides down on the surface of the braking member 102, and the trailing edge of the document jumps upward by the difference between the moment and the gravity. Further, when the succeeding document hits the trailing end of the flipped-up document, the rotating moment is accelerated and the document is easily turned over.

Further, if a succeeding document enters below the trailing edge of the flipped-up end, the order of ejection will be changed.

This tendency becomes remarkable as the sheet interval is shortened in order to shorten the image recording process time.

FIG. 10 shows the relationship between the stacking device and the discharge arrival position. (101) is the position when the braking member 102 of the stacking device is set to the maximum paper discharge size, (102 ') is the position when it is set to the minimum paper discharge size, 111 is the image recording apparatus main body, and 113 is the paper discharge port , 125 are the discharge drive rollers,
Reference numeral 128 is a paper discharge driven roller, 138 is a trajectory drawn by the discharged paper, and α is a paper discharge angle.

As shown in the figure, the position at which the discharged paper strikes the braking member 102 differs depending on the paper size. If the discharge angle α is determined based on the arrival position of the discharged paper at the maximum discharged paper size position (102), the minimum discharged paper size position In (102 ′), since the brake member 102 hits above the brake member 102, the brake member 102 must be provided high, and the small free-falling paper sheets may be unstable in behavior due to air resistance and disturb the stacking state. Become.

It should be noted that, in reality, the discharged paper may not reach, but the discharge angle α is made larger,
If the sheet is abutted at a height that does not cause an unstable drop even with the smallest discharge size, the angle θ between the direction perpendicular to the braking member 102 and the paper sheet increases, and as described with reference to FIG. It becomes easier to change the order.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to change the shooting order or eject the sheets even if the ejection speed of the ejected sheets is high. An object of the present invention is to provide a paper sheet stacking device in which the paper sheets are not turned over, bent, or scattered.

[0024]

In order to achieve the above object, according to the present invention, in a paper sheet stacking device for stacking discharged paper sheets by braking them with a braking member, a surface of the braking member is provided. It is characterized in that a plurality of irregularities are provided on the.

Further, in the paper sheet stacking device for stacking discharged paper sheets by braking them with a braking member, the surface friction coefficient of the braking member with respect to the paper sheets is 0.3 or more. .

Further, the paper sheets discharged from the discharging means are
In a paper sheet stacking device that brakes and stacks a position changeable braking member with respect to the discharging unit, a position detecting unit that detects a position of the braking member with respect to the discharging unit and / or a stacking amount of paper sheets. And a discharge angle changing means for changing the paper sheet discharge angle of the discharging means, and based on the detection result of the position detecting means and / or the stacking amount detecting means, The discharge angle changing means is controlled.

Further, it is characterized in that it is provided with the paper sheet stacking device and an image recording apparatus main body for forming an image on the paper sheet and discharging it to the paper sheet stacking device.

[0028]

In the present invention having the above-mentioned structure, since a plurality of irregularities are provided on the surface of the braking member, the frictional force acting on the leading end of the sheet when the discharged sheet hits the braking member is reduced. The height of the sheet is prevented from slipping down on the surface of the braking member as in the conventional case, and the discharged sheet is prevented from being turned over or scattered.

Incidentally, such an effect can be obtained similarly even when the surface friction coefficient of the braking member is 0.3 or more.

Further, the position of the braking member with respect to the discharging means is moved depending on the size of the paper sheet, and the angle at which the paper sheet abuts on the braking member changes with the movement, but in the present invention, the position detection The position of the braking member with respect to the discharging unit is detected by the means, and the discharging angle of the discharging unit is changed based on the detection result, so that the sheet is always used as the braking member at an appropriate angle regardless of the size of the sheet. Since they can be abutted against each other, the flipping and scattering of the paper sheets can be prevented.

Further, the stacking amount detecting means detects the stacking amount of the paper sheets, and the discharging angle of the discharging means is changed based on the detection result, so that the sheets are discharged by the upper surface of the already stacked sheets. Since the tip of the paper sheet can be abutted against the braking member while supporting the tip of the paper sheet, it is possible to prevent the paper sheet from being turned over or scattered.

In particular, by changing the discharge angle of the discharge means based on the detection results of both the position detection means and the load amount detection means, the leading edge of the discharged paper sheets can be set to the end of the already stacked paper sheets. Since the leading edge of the paper sheet can be made to reach the vicinity of the tangent line between the upper surface and the side surface of the braking member, it is possible to prevent the paper sheet from being turned over or scattered.

[0033]

【Example】

(First Embodiment) FIG. 5 shows a perspective view of an image recording apparatus (rotary camera) body using the present invention, and FIG. 6 shows a sectional view of the apparatus.

1 is a stacking device as a paper sheet stacking device, 2
Is a braking member, 3 is a slider, 4 is a center rail, 5
Is a regulating plate, 6 is a guide stand, 11 is the image recording apparatus main body, 1
2 is a paper feed port, 13 is a paper ejection port, 14 is a front rail, 1
5 is a film cartridge insertion port, 16 is a transport operation panel, 17 is a shooting operation panel, 18 is a paper feed thickness adjusting knob, 1
9 is a paper feed separation roller, 20 is a paper feed path switching guide, 21
Is a paper detection sensor, 22 is an illumination lamp, 23 is a flat glass, 24 is a reflection mirror, 25 is a paper ejection drive roller, 26 is a manual feed guide plate, 27 is a conveyor belt, 28 is a paper ejection driven roller, and M is a paper sheet. The paper discharge drive roller 25 and the paper discharge driven roller 28 constitute a paper discharge means 42.

A photographic film (not shown), which is a recording medium, is set in the film cartridge insertion port 15, and operations such as lead feeding and setting of a counter necessary for photographic are performed on the photographic operation panel 17. The stacking device 1 is adjusted to the document size and the shooting position. The guide base 6 fitted with the front rail 14 is movable left and right to the photographing position, and the slider 3 fitted with the center rail 4 is movable back and forth to match the size of the original. By setting the originals in the paper feed port 12 and operating the transport operation panel, the set originals are fed one by one into the image recording apparatus 11 by the paper feed / separation rollers 19 which rotate in opposite directions. The paper detection sensor 21 detects that the original has been conveyed, and operates so that an image recording process (not shown) is synchronized with the original. Further, the original is sent to the image projection area by the conveyor belt 27. The two illumination lamps 22 simultaneously illuminate the front side and the front side of the original passing through the gap of the flat glass 23, and the reflection mirror 24 and the image forming lens (not shown) connect the image of the original to the film surface (not shown) at the same time. Further, the document is sent by the transport belt 27 and the discharge rollers 25, 2
The sheet is discharged from the sheet discharge port 13 to the outside of the recording apparatus main body 11 by 8.

FIG. 1 is a perspective view of the stacking device according to the present invention as viewed from the sheet discharge side of the image recording device 11.

1 is a loading device, 2 is a braking member, 3 is a slider, 3a is a ground contact, 4 is a center rail, 5 is a regulating plate, 6 is a guide base, and 9 is a grooved surface provided on the braking member 2. Represent

The stacking device 1 can move the position of the braking member 2 back and forth and left and right in order to stack discharged documents according to the size and position of the document to be image-recorded.

The braking member 2 is attached to the slider 3, and the slider 3 can be moved back and forth using the center rail 4 as a guide.

Further, in FIG. 1, there is a rail for left and right movement at a position hidden, and the guide base 6 can be moved left and right.
The braking member 2 is made of a conductive material, and is grounded to the main body of the image recording apparatus through the ground contact 3a of the slider and the guide base 6.

Regulation plates 5 are provided on both sides of the guide base 6 to prevent discharged paper sheets from laterally protruding from the guide base 6 and collapsing. The braking member 2 has a file-like groove 2a that is horizontally engraved over almost the entire area thereof, thereby forming a plurality of irregularities.

FIG. 2 shows a detailed sectional view of the braking member according to the present invention. As shown, pitch 0.5 on a sheet metal with a thickness of 1.0 mm
mm, depth 0.3 mm, slanted groove (tapered groove) 2
a is engraved.

The anti-vibration rubber 7 on the back surface is attached in order to reduce the impact sound generated when the discharged paper hits the braking member 2.

The dimensions here are examples obtained based on the size and thickness of the paper sheets handled by the image recording apparatus embodying the present invention, and are not intended to limit the present invention.

The shape of the groove is not limited to that of this embodiment.

FIG. 3 shows a perspective view of the braking member according to the invention. When the groove shape as shown in FIG. 2 is processed into a sheet metal, its end face becomes sawtooth and becomes a dangerous shape when touched by a hand or the like. Therefore, chamfering 8 is provided by chamfering the edge of the braking member 2 having the groove.

In this embodiment, the braking member 2 is made of sheet metal (aluminum alloy) in order to eliminate static electricity on discharged paper sheets. However, the material is not limited to sheet metal and may be made of any conductive material. Molding may be performed using resin or the like.

By providing the groove shape 9 on the surface of the braking member 2 as described above, the ejected paper sheet is increased even if the angle θ (see FIG. 7) formed by the paper sheet and the direction perpendicular to the braking member 2 becomes large. The flip-up moment of the trailing edge of the paper caused by the slip of the leading edge can be prevented, and the sheets can be stacked without turning over the sheets or changing the order.

FIG. 4 shows an application example of this embodiment. The surface of the grooved surface 9 shown in FIG. 1 is a rough surface (roughness (maximum size Rmax = 0.2 mm of minute irregularities forming roughness) of about 10 mm). In the embodiment described above, the groove 2
The generation of the moment was suppressed by hooking the tip of the paper sheet on a, but in the application example, the frictional force between the tip of the paper sheet and the braking member 2 is increased by increasing the surface friction coefficient of the braking member 2, and I made the tip temporarily resist gravity. In addition to this, as a method of increasing the surface friction coefficient of the braking member 2, a conductive rubber having a friction coefficient of 0.3 or more is coated,
It is also an effective means to make the coated surface pear-like (rough surface).

Several kinds of surface conditions are prepared with a metal plate such as aluminum alloy, copper alloy, steel, etc. by etching or polishing, and a bundle of papers is dragged on it to measure the friction coefficient, and the metal plate is braked. According to the results of the experiment using the member, the larger the friction coefficient, the less the probability that the front end of the paper slips. The friction coefficient is 0.1 to 0.3, which is not so different from the conventional one, and 0.1 or less. Almost all the paper slipped and was scattered. Therefore, in order to embody the concept of the present invention, it is practically important to use a braking member having a friction coefficient of 0.3 or more, and a friction coefficient of 0.6 or more is preferable to obtain better results. You can

(Second Embodiment) FIGS. 8 and 9 show a second embodiment according to the present invention. (2) is the braking member 2 of the loading device
Is the maximum discharge size, (2 ') is the minimum discharge size, 25 is the discharge drive roller, and (28) is the stacker is the maximum discharge size. Of the paper discharge driven roller, (28 ') is the position of the paper discharge driven roller when the stacking device is set to the minimum paper discharge size, 38 is the trajectory of the discharged paper sheets, and θ is perpendicular to the braking member 2. Indicates the angle between the direction and the paper sheet.

Paper discharge rollers 25, 28 forming the discharge means 42
First, the paper sheets discharged by the discharge rollers 25, 28
It jumps out in the shared tangential direction, and then has its initial velocity and falls freely.

As shown in the figure, when the stacking device 1 is set to the maximum discharge size, the discharge driven roller 28 is positioned on the discharge port 13 side so that the common tangent line of the discharge rollers 25 and 28 becomes substantially horizontal. When the stacking device 1 is set to the minimum paper discharge size (2 '), the paper discharge driven roller can be brought to a position (28') apart from the paper discharge port 13 side to make the paper discharge angle downward. It can be seen that θ is almost the same in both cases.

Since the paper ejection angle can be changed depending on the position of the stacking device 1, the height of the braking member is such that the paper ejection jumps out of the braking member 2 with the paper ejection angle adjusted to the maximum paper ejection size. But I can accept it enough.

FIG. 8 is a diagram showing the construction of the second embodiment. The figure illustrates a schematic configuration of a paper discharge roller portion of a paper sheet stacking apparatus according to the present invention.

Reference numeral 25 is a sheet discharge driving roller, 28 is a sheet discharge driven roller, 29 is an inter-axis regulating member, 30 is a sheet discharge driving roller shaft,
31 is a discharge angle displacement link, 32 is a discharge driven roller shaft,
33 is a fulcrum, 34 is a rack gear, 35 is an operating shaft, 36 is a pinion gear, and 37 is a pulse motor. The members 29, 30, 31, 32, 33, 34, 35, 36, 3
The discharge angle changing unit 43 is configured to have the unit 7.

Power is transmitted to the paper discharge drive roller 25 from a drive motor (not shown) and rotates around the paper discharge drive roller shaft 30. The paper discharge driven roller 28 is the paper discharge drive roller 25.
Inter-axis restricting member 29 that keeps a predetermined distance so as to come in contact with
And is rotatable around the discharge driving roller 25.

The paper discharge angle displacement link 31 is rotatable about a fulcrum 33 fixed to the image recording apparatus main body,
In the slotted holes at both ends, the paper discharge driven roller shaft 32 and the operating shaft 3
5 is slidably fitted. The operating shaft 35 is fixed to the rack gear 34, and the pinion gear 36 is rotated by the drive of the pulse motor 37, and the rack gear 34 that is meshed with the pinion gear 36 can be moved to the left and right in the drawing.

The position detecting sensor 39 (FIG. 8B) as the position detecting means of the braking member 2 detects the position where the braking member 2 is set, and based on the detection signal, the sequence circuit 40 outputs only a predetermined amount. The pulse motor 37 is driven, and the paper discharge driven roller 2 is driven by the link mechanism described above.
8 is displaced to a predetermined position.

In the embodiment, the configuration in which the sheet discharge angle is changed by changing the angle of the sheet discharge rollers 25 and 28 has been described. However, the sheet discharge rollers 25 and 28 are fixed and the angle is changed after that. It is also possible to control the paper ejection angle using a guide member that can be used, or to drive the two paper ejection rollers separately rather than the driven paper ejection roller 28, and to change the paper ejection direction by the difference in their rotation speeds. Conceivable.

In addition to the continuous angle change by the drive of the pulse motor, a certain degree of effect can be expected even if the discharge direction is changed in two stages by the bipolar control using the plunger, and the paper type size to be handled varies widely. It is sufficiently effective in an image recording apparatus without a recording medium.

In addition to changing the sheet discharge angle according to the sheet discharge size, the sequence circuit is based on the detection signal of the stacking amount detection sensor 41 as the stacking amount detecting means for detecting the stacking amount on the sheet stacking device 1. The pulse motor 37 is driven by a predetermined amount by 40, and the discharge driven roller 28
Is displaced to a predetermined position and the discharge angle is changed, the braking member 2
It is possible to stabilize the behavior of the discharged document that collides with and falls.

By changing the paper ejection direction, if the paper is ejected in a locus such that the leading edge of the paper ejection reaches near the tangent line between the upper surface of the already ejected paper and the side surface of the braking member 2, the paper is loaded. The leading edge of the discharged sheet is supported by the discharged original document, and slippage with the braking member 2 can be prevented.

Further, by controlling the discharge angle linked to the discharge size information, the optimum discharge state can be maintained regardless of the document size and the stacking amount.

[0065]

As described above, according to the present invention,
Since multiple irregularities are provided on the surface of the braking member, the frictional force that acts on the tip of the paper sheet when the ejected paper sheet hits the braking member is increased, and the tip of the paper sheet is braked as in the past. The member is prevented from sliding down on the surface of the member, and the discharged sheets are prevented from being turned over or scattered.

Incidentally, such an effect can be obtained similarly even when the surface friction coefficient of the braking member is 0.3 or more.

Further, the position of the braking member with respect to the discharging means is moved depending on the size of the paper sheet, and the angle at which the paper sheet hits the braking member changes with the movement, but in the present invention, the position detection The position of the braking member with respect to the discharging unit is detected by the means, and the discharging angle of the discharging unit is changed based on the detection result, so that the sheet is always used as the braking member at an appropriate angle regardless of the size of the sheet. Since they can be abutted against each other, the flipping and scattering of the paper sheets can be prevented.

Further, the stacking amount detecting means detects the stacking amount of the paper sheets, and the discharge angle of the discharging means is changed based on the detection result, so that the sheets are discharged by the upper surface of the already stacked sheets. Since the tip of the paper sheet can be abutted against the braking member while supporting the tip of the paper sheet, it is possible to prevent the paper sheet from being turned over or scattered.

In particular, by changing the discharge angle of the discharge means based on the detection results of both the position detection means and the stacking amount detection means, the leading edge of the discharged paper sheets can be changed to that of the already stacked paper sheets. Since the leading edge of the paper sheet can be made to reach the vicinity of the tangent line between the upper surface and the side surface of the braking member, it is possible to prevent the paper sheet from being turned over or scattered.

[Brief description of drawings]

FIG. 1 is a perspective view of a paper sheet stacking device according to a first embodiment of the present invention as seen from a paper exit side.

FIG. 2 is a detailed cross-sectional view of a braking member of the same device.

FIG. 3 is a perspective view of the braking member.

FIG. 4 is a perspective view of a paper sheet stacking device according to an application example of the embodiment as viewed from a paper exit side.

FIG. 5 is a perspective view of an image recording apparatus according to the present invention.

FIG. 6 is a schematic sectional view of the image recording apparatus.

FIG. 7 is an explanatory diagram of a paper discharge behavior of the paper sheet stacking device according to the first embodiment of the present invention.

FIG. 8 relates to a paper sheet stacking device according to a second embodiment of the present invention,
(A) is a configuration explanatory view of the same apparatus, (b), (c) is a block diagram of the same apparatus.

FIG. 9 is a diagram showing a relationship between the stacking device and a paper discharge arrival position.

FIG. 10 is a diagram showing a relationship between a conventional paper sheet stacking device and a discharge arrival position.

FIG. 11 is a perspective view of the stacking device.

FIG. 12 is a sectional view of a conventional image recording apparatus.

FIG. 13 is a diagram illustrating a problem of a conventional paper sheet stacking device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loading device (paper sheet loading device) 2 Braking member 11 Image recording device main body 39 Position detection sensor (position detection means) 41 Loading amount detection sensor (loading amount detection means) 42 Ejecting means 43 Ejection angle changing means M Original (paper Leaves)

Claims (4)

[Claims] 1. A paper sheet stacking apparatus for stacking discharged paper sheets by braking them with a braking member, wherein a plurality of irregularities are provided on a surface of the braking member. 2. A paper sheet stacking device that brakes and stacks discharged paper sheets by a braking member, wherein a surface friction coefficient of the braking member with respect to the paper sheets is 0.3 or more. Paper sheet stacking device. 3. A paper sheet stacking device for stacking paper sheets discharged from a discharging means by braking the position of the discharging means by a braking member capable of changing its position, wherein The position detecting means includes a position detecting means for detecting a position and / or a load amount detecting means for detecting a load amount of paper sheets, and a discharge angle changing means for changing a paper sheet discharge angle of the discharge means. And / or controlling the discharge angle changing means based on the detection result of the stacking amount detecting means. 4. An image, comprising: the paper sheet stacking device according to claim 1; and an image recording apparatus main body that forms an image on the paper sheet and discharges the image onto the paper sheet stacking device. Recording device.