JP2000103565A - Sheet receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guide a movable tray member with a simple constitution. SOLUTION: A sheet receiving device 10 is provided with a support tray member 14, and a movable tray member 16 to store a sheet to be discharged. The rotation of a motor 42 inside the support tray member 14 is transmitted to a pinion 46 to be engaged with a rack 48 of the movable tray member 16, and the movable tray member 16 is movable in the transverse direction. The movable tray member 16 is guided through the slide on a plurality of guide shafts 30, 32 mounted on the support tray member 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet receiving device provided in an image forming apparatus such as a copying machine or a printer.

[0002]

2. Description of the Related Art In an image forming apparatus such as a copying machine, printed sheets are sequentially discharged to a sheet receiving apparatus. 2. Description of the Related Art Offset catch trays have been conventionally used to facilitate sorting of a plurality of sets of sheets. The offset catch tray has a movable tray member,
Each time one set of printing is completed, the movable tray member is moved in a direction orthogonal to the sheet conveying direction. As a result, the sheets are alternately stacked on the movable tray member, and the positions of the side edges of the sheets are different between one set and another set even if they are of the same size, thereby facilitating the sorting.

[0003]

In the conventional offset catch tray, a movable tray member is guided by a large number of rollers or the like to reduce the resistance to power and improve the product life. However, in the conventional technology, not only a large number of rollers are required, but also a shaft or the like serving as a core of the rollers is required, so that the number of parts is increased, the cost is increased, and the number of processes is also increased. In addition, repair when the roller is damaged is troublesome.

Accordingly, it is an object of the present invention to provide a sheet receiving device capable of guiding a movable tray member with a simple configuration.

[0005]

According to the present invention, there is provided a sheet receiving apparatus comprising: a supporting means; a plurality of substantially parallel guide shafts attached to the supporting means; A movable tray means for movably attached to the supporting means so as to be guided and accommodating ejected sheets, and a driving means for driving and moving the movable tray means. Features. According to the sheet receiving device of the present invention, the movable tray means is guided by sliding on a plurality of substantially parallel shafts. Accordingly, since no roller or the like is used, the movable tray means can be guided with a simple configuration, and the number of parts is reduced, the cost is reduced, and the number of steps is reduced. Also, the number of steps for repair may be small.

In the present invention, the support means and the movable tray means are provided with a bearing into which the guide shaft is inserted, and at least one of the support means and the movable tray means is provided with the bearing. At least one of them may be attached so as to be finely movable. It is difficult to arrange a plurality of guide shafts completely parallel to each other. However, since at least one bearing can be finely moved in this way, even if the guide shafts are not parallel to each other, the guide shaft supported by the bearing moves while the movable tray means moves. It is slightly moved by the force from the means and becomes parallel to the other guide shafts. Therefore, the movable tray means moves smoothly while being guided by the guide shafts parallel to each other. Also,
The fine movement of the guide shaft facilitates the assembly of the sheet receiving device. That is, after one guide shaft is inserted into all the corresponding bearings, it can be easily inserted into the corresponding bearings while slightly moving the other guide shafts.

In the present invention, the support means and the movable tray means are provided with a bearing into which the guide shaft is inserted, and at least one of the bearings is provided inside the corresponding guide shaft inside the bearing. Fine movement may be allowed. In this way, at least one bearing allows the fine movement of the guide shaft inside the bearing, so that even if the guide shafts are not parallel to each other, the movable shaft means moves while the movable tray means moves. The guide shaft supported by the bearing is slightly moved by receiving a force from the movable tray means, and becomes parallel to the other guide shafts. Therefore,
The movable tray means moves smoothly by being guided by guide shafts parallel to each other. Further, the guide shaft slightly moves, so that the sheet receiving device can be easily assembled.

The possible displacement of one of the guide shafts may be smaller than the possible displacement of the other guide shaft. If both guide shafts have the same possible range of displacement, the movement of the movable tray means becomes unstable. However, by making the possible displacement of one guide shaft smaller than that of the other guide shafts, the movement of the movable tray means will be such that the other guide shafts will move parallel to one guide shaft, so Stabilize. Therefore, it is possible to reduce the occurrence of play between the movable tray means and other components and the deterioration of performance such as damage to the components over a long period of use.

The movable tray means may be a single tray. However, a second tray movably attached to the support means so as to be guided by sliding on the guide shaft. It may be provided with a supporting means and at least one sheet receiving tray attached to the second supporting means and accommodating discharged sheets.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a sheet receiving device (offset catch tray) 10 according to the present invention is supported in a cantilever manner by a main body cabinet 12 of a copying machine having an image forming unit for printing on a sheet. I have. The sheet receiving device 10 includes a support tray member 14 and a movable tray member 16, and the support tray member 14 is attached to a mounting plate 18 provided on the main body cabinet 12. It is movably supported with respect to. The mounting plate 18 is located immediately below the sheet discharge port in the main body cabinet 12, and the movable tray member 16 receives the sheet S discharged from the sheet discharge port after printing. However, this sheet receiving device 1
0 can be provided not only in the copying machine but also in other image forming apparatuses such as a printer and a facsimile.

The support tray member 14 is formed from a resin. As shown in FIGS. 3 to 5, it has a flat rectangular parallelepiped shape with a small thickness, and at one end thereof, an inclined reference wall portion 20 which is in surface contact with the mounting plate 18 of the main body cabinet 12 is formed. I have. As shown in FIGS. 6A and 6B, two projections 21 are formed on the reference wall 20. Each protrusion 21 includes a base 21a connected to the reference wall 20 and a tip 21b wider than the base 21a. The protrusion 21 is provided with a hole 19 formed in the mounting plate 18.
To be inserted respectively. The hole 19 has a wide portion 19a and a narrow portion 19b connected thereto. Then, after passing the distal end portion 21b through the wide portion 19a of the hole 19, the support tray member 14 is slid in the lateral direction so that the base portion 21a is positioned at the narrow portion 19b. Are hooked to the mounting plate 18 so that the support tray member 14 is mounted.

As shown in FIG. 5, the support tray member 14
Although it is not visible from the outside, it has a hollow structure having a cavity 15 inside, and is manufactured by, for example, blow molding. Further, as shown in FIGS. 3 and 4, a concave portion 22 is formed in the center of the support tray member 14. Recess 2
2 is a reference wall 20, a side wall 24, 26 and a rear wall 2
8.

The support tray member 14 includes two guide shafts 3 which are linear metal round bars substantially parallel to each other.
0, 32 are attached. Specifically, the recess 22
Bearings 34 made of polyethylene resin
Are mounted, and these bearings 34 to 37 are mounted.
The guide shafts 30 and 32 are inserted. Further, as shown in FIG. 5, the side wall portions 24, 2 of the support tray member 14 are provided.
A through-hole 38 is formed in a wall constituting 6, and guide shafts 30 and 32 are inserted through the through-hole 38. However, the inner diameters of the bearings 34 to 37 are equal to the guide shafts 30, 32.
While the diameter of the through hole 38 in the side wall portions 24 and 26 is smaller than that of the guide shafts 30 and 3.
The guide shafts 30 and 32 are restrained by bearings 34 to 37 instead of the through holes 38.

The guide shafts 30 and 32 are made of stainless steel, and have extremely smooth surfaces so as to reduce the coefficient of friction. Grease is applied to the peripheral surfaces of the guide shafts 30 and 32 to reduce friction. The direction in which the guide shafts 30 and 32 extend is a direction orthogonal to the direction in which the sheet S is discharged.

As shown in FIGS. 3 and 4, a second recess 39 is formed at the center of the recess 22. As shown in FIG. The drive unit 40 is arranged in the second recess 39. The drive unit 40 includes a motor 42, a reduction gear box 44 in which a gear train is built, and a pinion 46. The rotation of the motor 42 is reduced by the gear train and transmitted to the pinion 46. The direction of rotation of the pinion 46 is the guide shaft 30,
32 is parallel to the extending direction.

The movable tray member 16 is a thin plate made of resin. The end portion 47 of the movable tray member 16 is inclined and is parallel to the mounting plate 18 of the main body cabinet 12.
On the back surface of the movable tray member 16, a rack 48 that meshes with the pinion 46 is provided. Further, two thin ridges 50 for reinforcement are formed on the back surface of the movable tray member 16, and bearings 52 to 55 are formed to accompany each ridge 50. Guide shafts 30, 3 are provided on bearings 52-55.
2 are inserted and the bearings 52 to 55 allow the guide shaft 30,
The movement of each of the members 32 in the axial direction is suppressed. Accordingly, when the motor 42 is driven, the rotation of the pinion 46 is transmitted to the rack 48, and the movable tray member 16 is guided by the guide shafts 30 and 32, and is lateral to the support tray member 14 (perpendicular to the sheet conveyance direction). Direction). As a means for moving the movable tray member 16, other mechanisms such as an endless belt mechanism and a linear motor may be employed in addition to the rack-pinion mechanism.

The motor 4 is controlled by a control unit (not shown).
2 is controlled and each time one set of printing is completed,
The movable tray member 16 is moved laterally. This allows
The sheets S are alternately stacked on the movable tray member 16, and one set and another set have different side edge positions of the sheets S even if they have the same size, thereby facilitating sorting. The support tray member 14 is provided with sensor means (not shown) for monitoring the operation of the movable tray member 16. For example, the sensor means
Two optical sensors for detecting that the movable tray member 16 has reached both ends of an allowable stroke, and output signals thereof are supplied to a control unit. When the sensor detects that the movable tray member 16 has reached the end of the stroke, the control unit stops the motor 42.

This control unit comprises a main body cabinet 1
2 on a control board (not shown).
Such a sheet receiving device (offset catch tray) 1
0 generally indicates the main body cabinet 12 according to the user's request.
If the user does not desire, a normal fixed type tray is usually attached to the main body cabinet 12 instead of the sheet receiving device 10. If a control unit is provided in advance on the control board of the main body cabinet 12, when the sheet receiving device 10 is provided, the control unit and the motor 42 can be easily connected.
If the sheet receiving device 10 is not provided, the control unit is useless. However, if the control unit is not provided in the main body cabinet 12 and the sheet receiving device 10 is provided later according to a user's request, a large number of modifications are required to the control system of the main body cabinet 12. It is advantageous to provide a control unit on the control board in advance.

As described above, in the sheet receiving apparatus 10 according to the present embodiment, the movable tray member 16 is guided by sliding with respect to the plurality of parallel guide shafts 30, 32. Therefore, since rollers are not used,
The movable tray member 16 can be guided with a simple configuration, so that the number of parts is reduced, the cost is reduced, and the number of steps is reduced. Also, the number of steps for repair may be small.

Further, in the sheet receiving apparatus 10, the guide shafts 30, 32 can be relatively slightly moved, so that even if the guide shafts 30, 32 have an inferior parallelism in the initial state, they are movable. It is automatically improved with the movement of the tray member 16. Hereinafter, the structural features that provide this effect will be described.

As shown in FIGS. 7 and 8, each of the bearings 34 to 37 provided on the support tray member 14 and supporting the guide shafts 30 and 32 is a flat plate in contact with the bottom surface of the concave portion 22 of the support tray member 14. A portion 60, a substantially circular tube portion 61 protruding upward from the center of the flat plate portion 60, and legs 62 protruding downward from both ends of the flat plate portion 60. The corresponding guide shaft 30 or 32 is inserted into the circular tube portion 61. The leg 62 is provided in the recess 2 of the support tray member 14.
2 is inserted into a through hole 63 formed at the bottom of the second. Leg 6
At the lower end of 2, a hook 64 that becomes thinner toward the lower end is formed, so that the leg 62 inserted into the through hole 63 is not easily pulled out by the hook 64.

However, as shown in FIG.
Are formed larger than the portions of the legs 62 other than the hooks 64, so that each leg 62 can slightly move inside the through hole 63. The flat plate 6
0 has a circular convex portion 66 formed on the lower surface thereof.
6 is fitted into a circular small recess 67 formed on the bottom surface of the recess 22. Therefore, each of the bearings 34 to 37 can swing about the convex portion 66. That is, each of the bearings 34 to 37 is attached to the support tray member 14 so as to be finely movable.

FIG. 9 shows bearings 52 to 55 provided on the movable tray member 16 and supporting the guide shafts 30 and 32.
FIG. 5 is a plan view showing details of the bearings, and shows side views of the bearings 52 to 55 in a circle. First, the right bearings 53 and 5 in FIG.
The structure of No. 5 is as follows. That is, each of the bearings 53 and 55 is composed of mutually parallel side walls 70 and 71 integrally connected to the ridge 50, an end wall 72 partially connected to the side walls 70 and 71, and a hook 73 formed at the tip of the end wall 72. The side walls 70, 71, the end wall 72, and the hook 7
The end of the guide shaft 30 or 32 is inserted into the space surrounded by 3. Further, a center wall 74 protrudes from the end wall 72, and the end of the guide shaft 30 or 32 is sandwiched between the end of the center wall 74 and the hook 73, and the movement of the guide shaft 30 or 32 is prevented. It is being regulated.

A slit 7 is provided between the end wall 72 and the side wall 70.
5 are formed, and a slit 76 is also formed between the end wall 72 and the side wall 71. Therefore, the end wall 72 is supported in a cantilever shape and can be bent, and the hook 73 at the tip thereof is displaceable. The bearings 53 and 55 thus formed are the same in size.

Next, the left bearings 52, 54 in FIG.
Has the following structure. That is, each bearing 5
2 and 54 are mutually parallel side walls 80 and 81 integrally connected to the ridge 50, an end wall 82 connecting the side walls 80 and 81,
And a front wall 83 connecting the end portions of the side walls 80, 81 and the end wall 82. The guide shaft 3 is provided in a space surrounded by the side walls 80, 81, the end wall 82, and the front wall 83.
0 or 32 ends are inserted. A center wall 84 is projected from the end wall 82, and an end of the guide shaft 30 or 32 is sandwiched between an end of the center wall 84 and the front wall 83. Movement is regulated.

No slits such as the above-mentioned slits 75 and 76 are formed in the bearings 52 and 54, and the end wall 82 and the front wall 83 are hardly deformed. Support tray member 14
When attaching the guide shafts 30 and 32 already attached to the movable tray member 16, first, the left ends of the guide shafts 30 and 32 are attached to bearings 52 and 54, respectively.
First, the right ends are fitted into the bearings 53 and 55 by utilizing the elastic bending of the end wall 72. After this,
As long as the end walls 72 of the bearings 53 and 55 are not forcibly bent with a large force, the guide shafts 30 and 32 do not come off the movable tray member 16.

In FIG. 9, the left bearings 52, 54 have different sizes. That is, the side walls 80 and 81 of the bearing 53
Are made larger than that of the bearing 52. As shown, the inner width of the other bearings 52, 54, 55 (the distance between the side walls 70, 71 or the distance between the side walls 80, 81) is only about 1 mm larger than the diameter of the guide shafts 30, 32, and Only a small amount of movement of the guide shafts 30, 32 is allowed inside 52, 54, 55. On the other hand, the width of the inside of the bearing 53 (the interval between the side walls 80 and 81) is larger than the diameter of the guide shaft 32 by 2 to 10 mm.
Fine movement is possible within a range of 10 mm. The direction in which the guide shaft can be finely moved is the same as the plane on which the bearings 34 to 37 provided on the support tray member 14 can swing.

As described above, the bearings 34 to 37 mounted on the support tray member 14 are finely movable, and the guide shafts 30 and 32 are finely movable inside the bearings 52 to 55 provided on the movable tray member 16. By being
Even if the guide shafts 30 and 32 are not parallel to each other, the bearings 34 and
The guide shafts 30 and 32 supported by 37 receive a force from the movable tray member 16 to move slightly, and the other guide shafts 3
It is parallel to 0,32. Accordingly, the movable tray member 16 moves smoothly by being guided by the guide shafts 30 and 32 parallel to each other. This feature is advantageous because it is difficult to completely align the guide shafts 30, 32 in the manufacture of the sheet receiving device 10.

Further, the guide shafts 30, 32 are slightly moved, so that the sheet receiving apparatus 10 can be easily assembled. That is, after one guide shaft 30 is inserted into all the corresponding bearings 34, 35, 52, and 53, the other guide shaft 32 is easily moved into the bearing 53 to be inserted second from the last while being slightly moved. Can be easily inserted into the bearing 55 to be inserted last.

In this embodiment, the possible displacements of the guide shaft 30 and the guide shaft 32 are different as described above. If both guide shafts 30 and 32 have equal ranges of displacement, movable tray member 16
Movement becomes unstable. However, one guide shaft 3
By making the possible displacement of zero smaller than the other guide shaft 32, one guide shaft 30
Since the other guide shafts 32 move in parallel, the movement of the movable tray member 16 is stabilized. Therefore,
Through use for a long period of time, it is possible to reduce the occurrence of play between the movable tray member 16 and other members and the deterioration of performance such as breakage of the members.

In the above embodiment, the support tray member 14
The bearings 34 to 37 are attached to the movable tray member 16 so as to be swingable.
Fine movement of 0, 32 is possible. However, conversely, a bearing may be attached to the movable tray member 16 so as to be swingable, and the bearing provided on the support tray member 14 may enable fine movement of the guide shafts 30 and 32. In the above embodiment, all the bearings of both of the two guide shafts 30 and 32 are finely movable or allow the fine movement of the shafts. Such a bearing may be finely movable or may allow fine movement of the shaft.Moreover, three or more guide shafts substantially parallel to each other may be provided, and in this case, all the bearings of all the guide shafts are finely movable or The fine movement of the shaft may be allowed, or only one of the guide shafts may not move, and the bearing of the other guide shaft may be finely movable or the shaft may be finely moved. Good.

In the above-described embodiment, the movable tray member 16 moves on the support tray member 14. However, the present invention is not intended to be limited to this.
Are also within the scope of the present invention. In FIG. 10, a sorter or a mailbox 90 is provided on the side of the main body cabinet 12. Mailbox 90
Is a support plate 91 placed on the floor, and a pair of vertical guide walls (second support means) 92 erected on the support plate 91.
And a vertical movable box 93 disposed between the vertical guide frames 92, and a plurality of sheet receiving trays 94 fixed to the vertical movable box 93. The support plate 91 is the main body cabinet 12
It is connected to. By a known mechanism provided in the vertical guide frame 92, the vertically movable box 93 supporting the sheet receiving tray 94 can be moved vertically while being guided by the vertical guide frame 92, and can move in the vertical direction while being guided by the vertical guide frame 92. Any of the sheet receiving trays 9 located immediately below
4 receives the sheet discharged from the main body cabinet 12.

In this mailbox 90, a plurality of guide shafts 95 are attached to a support plate 91, and extend in a direction perpendicular to the paper surface of FIG. Although not shown, a drive device such as a motor and a rack-pinion mechanism is provided, and the vertical guide frame 92 slides with respect to the guide shaft 95 by receiving the driving force of the drive device. Guided to move sideways. Therefore, the plurality of sheet receiving trays 94 can be collectively moved in the horizontal direction (the direction orthogonal to the sheet discharging direction). Although not shown, the support plate 91 and the vertical guide frame 9
2 is provided with bearings for supporting the guide shaft 95, and any of the above-described mounting methods or the support method for the guide shaft 95 is adopted for these bearings. Therefore, at least one of the guide shafts 95 can be finely moved, so that the guide shafts 95 automatically become parallel with the movement of the vertical guide frame 92, and
The assembling of the mailbox 90 is easy.

The mailbox 90 is not limited to the main body cabinet 12 of the copying machine, but may be mounted on a printer. Further, a three-stage sorting tray unit similar to the mailbox 90 may be provided in an image forming apparatus having the functions of a copier, a printer, and a facsimile. The three-stage sorting tray unit has a structure roughly similar to that of the mailbox 90, but is provided with only three levels of sheet receiving trays 94. Sheets printed on each of these trays based on the original using the function of the copier,
A sheet printed based on a command from an external computer using a printer function and a sheet printed based on a command given from another facsimile via a communication line using a facsimile function are accommodated.

Further, the example shown in FIG. 11 is also within the scope of the present invention. In this example, a cabinet 100 of a finisher unit is connected to a main body cabinet 12 of an image forming apparatus such as a copying machine. Although the illustration of a detailed internal finisher unit structure is omitted, the finisher cabinet 100 includes one or more staplers and a folding device. Inside the finisher cabinet 100, a plurality of sheets printed by the image forming apparatus and discharged from the stack are stacked, and a stapler staples the sheets. When the stapler performs the middle closing, the stapled portion of the sheet is folded by the folding device. In this way, the sheets that are easily bound by the stapler (and the folding device as necessary) are discharged to the outside from the discharge port 101 above the finisher cabinet 100.

Above the finisher cabinet 100, a sheet receiving device 110 similar to the above-described sheet receiving device 10 is disposed. The sheet receiving device 110 includes:
The tray includes a support tray member 114 fixed to the top plate of the finisher cabinet 100, guide shafts 130 and 132 attached to the support tray member 114, and a movable tray member 116 supported by the guide shafts 130 and 132. The guide shafts 130, 132 extend in a direction perpendicular to the plane of the paper of FIG. Although not shown, a driving device such as a motor and a rack-pinion mechanism is provided, and the movable tray member 116 receives the driving force of the driving device.
Are laterally guided and guided by sliding on the guide shafts 130 and 132. Although not shown, the support tray member 114 and the movable tray member 116 include:
Bearings for supporting the guide shafts 130 and 132 are provided. For these bearings, any one of the above-described mounting methods or the support method for the guide shafts 130 and 132 is adopted. Therefore, the guide shafts 130, 1
32 can be finely moved, so that the guide shafts 130 and 132 automatically become parallel with the movement of the movable tray member 116, and the sheet receiving device 1
10 is easy to assemble.

[0037]

As described above, according to the present invention,
It is possible to guide the movable tray member with a simple configuration.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a sheet receiving device according to an embodiment of the present invention and a main body cabinet to which the sheet receiving device is attached.

FIG. 2 is a front view showing a copier to which the sheet receiving device is attached.

FIG. 3 is an exploded perspective view showing the sheet receiving device.

FIG. 4 is a plan view showing the sheet receiving device.

FIG. 5 is a front sectional view showing the sheet receiving device.

FIG. 6A is an exploded perspective view showing an attachment portion between the sheet receiving device and the main body cabinet,
(B) is a sectional view of the attachment portion.

FIG. 7 is an exploded perspective view showing a part of a support tray member in the sheet receiving device and a bearing attached thereto.

FIG. 8 is a bottom view showing the bearing.

FIG. 9 is a plan view showing details of a bearing provided on a movable tray member in the sheet receiving device.

FIG. 10 is a front view showing a copier equipped with a mailbox (sheet receiving device) according to another embodiment of the present invention.

FIG. 11 is a front view showing a copier to which a sheet receiving device according to still another embodiment of the present invention is attached.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Sheet receiving apparatus, 12 ... Copier main body cabinet, 14 ... Support tray member (support means), 16 ... Movable tray member (movable tray means), 30, 32 ... Guide shaft, 34-37 ... Bearing, 40 ... Drive unit (drive means), 42 ... motor, 44 ... reduction gear box, 46 ...
Pinion, 48 rack, 52 to 55 bearing, 0 mailbox (sheet receiving device), 91 support plate (support means), 92 vertical guide frame (second support means), 94
... Sheet receiving tray, 95 ... Guide shaft, 100 ... Finisher cabinet, 110 ... Sheet receiving device, 1
14: support tray member, 116: movable tray member, 13
0,132: guide shaft, S: seat

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Toru Wada 2274 Hongo, Ebina-shi, Kanagawa F-term in Fuji Xerox Co., Ltd. (reference) 2C059 AB01 AB22 BB10 BB11 DD05 DD08 DD15 DD30 2H072 FB02 FB09 FC16 HA01 JA04 JC02 3F054 AA01 AB01 AC02 AC03 AC05 BA02 BB05 BB13 BC01 BD03 BD06 BE12 BF04 BF14 BF24 BH12 BH25 BJ02 3F107 AA01 AB01 AC02 AC03 AC04 BA02 BA07 CB02 CB14 CB23 CB51

Claims (5)

[Claims] 1. A support means, a plurality of substantially parallel guide shafts attached to the support means, and a movement relative to the support means so as to be guided by sliding on the guide shaft. A sheet receiving apparatus, comprising: a movable tray means, which is attached so as to be capable of storing discharged sheets, and a driving means for driving and moving the movable tray means. 2. The support means and the movable tray means are provided with bearings into which the guide shafts are inserted, and at least one of the bearings is provided for at least one of the support means and the movable tray means. 2. The sheet receiving device according to claim 1, wherein one of the seat receiving devices is attached so as to be finely movable. 3. The support means and the movable tray means are provided with bearings into which the guide shafts are inserted, and at least one of the bearings controls the fine movement of the corresponding guide shafts inside the bearings. 3. The sheet receiving device according to claim 1, wherein the sheet receiving device is allowed. 4. The seat receiving device according to claim 2, wherein one possible displacement of the guide shaft is smaller than a possible displacement of the other guide shafts. 5. The movable tray means comprises: a second support means movably attached to the support means so as to be guided by sliding on the guide shaft; 5. The sheet receiving apparatus according to claim 1, further comprising at least one sheet receiving tray attached to said supporting means and accommodating discharged sheets.