JPH11278736A - Discharged sheet stacking device and image forming device provided with this discharged sheets stacking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharged sheet stacking device capable of preventing bend of a sheet without enlarging an installation area of an image forming device, and provide an image forming device provided with this discharged sheet stacking device. SOLUTION: A device is provided with a guide surface 61a for stacking the sheets P, which are discharged from a discharge port 71 after they are formed with an image by an image forming device, in an inclined sheet stacking means 60 provided outside a main body and, on the other hand, for directing the discharged sheets P in the direction along the sheet stacking means 60. A support member 61 for supporting the sheets P from under thereof is provided in the sheet stacking means 60, and teh sheets are moved along the guide surface 61a while supported from under thereof by the support means 61.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharged sheet stacking apparatus provided in an image forming apparatus such as a copying machine, a printer, a facsimile, etc. for stacking discharged sheets, and more particularly, to a structure of sheet stacking means for stacking discharged sheets. About.

[0002]

2. Description of the Related Art Conventionally, there is an image forming apparatus provided with a discharged sheet stacking device which discharges a sheet from an outlet and stacks the sheet on a sheet stacking means which is inclined so that the downstream side becomes higher. Examples of the device include a copying machine, a printer, and a facsimile device.

Here, a copying machine generally has a function of reading an image of a document or the like and forms an image on a sheet based on the read image information. Some have a function of inputting image information sent from the company.

[0004] A printer is generally an external device,
For example, a facsimile machine generally has a function of reading an image of a document or the like and a communication function, and sends the read image to the outside, based on image information sent from a device such as a computer. Further, an image is formed on a sheet based on information sent from outside.

As an example of such an image forming apparatus, an electrostatic latent image is formed on an image carrier, and the electrostatic latent image is visualized with toner, and then transferred to a sheet. There is a configuration in which a toner image is fixed on a sheet by heating.

FIG. 10 is a schematic diagram showing a main part of such a conventional image forming apparatus. In FIG. 10, reference numeral 14 denotes a thin plate-shaped heating element (hereinafter, referred to as a heater) whose longitudinal direction is perpendicular to the drawing. ). In general, a low-heat-capacity ceramic heater having a ceramic substrate and a heating resistor printed and fired on the substrate surface as a basic component is used as the heater 14.

Reference numeral 10 denotes a horizontal gutter-shaped heater support also serving as a film guide having a substantially semicircular cross section. A heater 14 is fixedly supported at the center of the lower surface of the heater support 10 with a heat-resistant adhesive or the like. Reference numeral 9 denotes a cylindrical (endless belt-shaped), thin heat-resistant film (hereinafter, referred to as a fixing film), which is loosely fitted to the heater support 10. Reference numeral 15 denotes a flange member that is provided so as to cover the heater support 10 and that receives the end of the fixing film and restricts the shift of the fixing film 9.

Reference numeral 11 denotes an elastic pressure roller.
A heating nip portion N as a heating portion having a required width is formed by pressing the lower surface of the heater 14 with a predetermined contact pressure against the elasticity with the fixing film 9 interposed therebetween.

Here, the pressure roller 11 is driven to rotate in the counterclockwise direction shown by an arrow by a driving means (not shown) at the time of image formation. Then, a rotational force is generated on the fixing film 9 due to the frictional force of the pressure contact between the pressure roller 11 and the fixing film 9 in the heating nip portion N. As a result, the fixing film 9 is driven to rotate around the outer periphery of the heater support 10 which also serves as a guide for the fixing film 9 in the clockwise direction as indicated by the arrow, while sliding the inner surface of the fixing film 9 into contact with the lower surface of the heater 14.

In the state where the fixing film 9 is rotated and the heater 14 generates heat by energization to control the temperature to a predetermined temperature, the fixing film 9 in the heating nip N and the pressure roller 11 When the recording material P, which is a sheet carrying the unfixed toner image T, is introduced with the toner image surface facing the fixing film, the recording material P The heating nip N is moved.

As a result, the recording material P is heated by the heater 14 via the fixing film 9 in the heating nip N, and the unfixed toner image T is softened and fused.
Thereafter, the recording material P passing through the heating nip N is separated from the film surface.

The recording material P separated from the film surface is guided by the upper discharge guide 50 and the lower discharge guide 40 to be guided to the holding portion between the roller 51 and the discharge roller 41, and then further downstream. And discharged from the discharge port 71 to the outside of the apparatus.

Thereafter, the recording material P discharged to the outside of the apparatus is discharged onto the stacking tray 160 and is stacked. Here, the upstream side of the stacking tray 160 is installed at a position lower than the holding portion of the roller 51 and the discharge roller 41 by a height at which the recording materials P are stacked.

[0014]

However, in such a conventional image forming apparatus, the discharged recording material P
First comes into contact with the stacking tray 160, and then moves downstream in the discharge direction along the stacking surface 160a of the stacking tray 160. At this time, the recording material P is In the case of an OHT sheet or the like having reduced rigidity immediately after being heated by the fixing unit, the movement to the downstream side in the discharge direction is not performed smoothly due to frictional resistance with the stacking tray 160 and the like.

If the recording material P does not move smoothly as described above, there is a problem in that the recording material P buckles as shown in FIG. Was. If the stacking tray 106 is tilted in the horizontal direction in order to reduce the frictional resistance, for example, the movement of the recording material P becomes smooth, but another problem arises that the installation area of the image forming apparatus is enlarged. I will.

Accordingly, the present invention has been made to solve such a conventional problem, and a discharge sheet stacking apparatus capable of preventing sheet buckling without increasing the installation area of an image forming apparatus. And an image forming apparatus provided with the same.

[0017]

According to the present invention, there is provided a discharge sheet stacking apparatus in which sheets discharged from a discharge port are stacked on sheet stacking means inclined so that the downstream side is higher. The means is provided with a guide surface for directing the discharged sheet in a direction along the sheet stacking means, and a support member for supporting the moving sheet from below is provided.

Further, the present invention is characterized in that the support member is provided in the sheet stacking means so as to be freely retractable, and is urged by an urging means so as to protrude from the sheet stacking means. is there.

Further, according to the present invention, the guide surface guides the sheet such that when the sheet comes into contact with the sheet stacking means, the sheet comes into contact at a smaller angle than when the sheet comes into direct contact with the sheet stacking means. It is characterized by the following.

Further, in the present invention, the urging means is an elastic member provided between the sheet stacking means and the support member.

Further, the present invention is characterized in that the urging means is an elastic member attached to a shaft provided on the sheet stacking means so as to hold the support member so as to be able to protrude and retract.

Further, the present invention is characterized in that a detecting means for detecting a displacement amount of the supporting member is provided, and discharge of the sheet is controlled based on a detection signal from the detecting means.

Further, the present invention is characterized in that the support member is formed of a conductive member, and a voltage having the same polarity as that of the sheet is applied to the support member.

According to the present invention, there is provided an image forming section, and a sheet formed by the image forming section is discharged from a discharge port, and is stacked on a sheet stacking means inclined so that the downstream side is higher. In an image forming apparatus including a sheet stacking device, the discharged sheet stacking device is the discharged sheet stacking device according to any one of claims 1 to 7.

Further, according to the present invention, while providing another discharge port and opening and closing the sheet stacking means, when the sheet stacking means is closed, the support member enters the discharge port. The closed sheet stacking means forms a transport path that serves as a guide for transporting the sheet to the other discharge port by using the support member that has entered the discharge port.

Further, as in the present invention, after the image is formed by the image forming unit, the sheet discharged from the discharge port is stacked on the inclined sheet stacking means provided outside the main body, and the discharged sheet is stacked on the sheet. A support member, which has a guide surface directed in the direction along the stacking means and supports the sheet from below, is provided in the sheet stacking means, and the sheet is moved along the guide surface while supporting the sheet from below.

[0027]

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

FIG. 1 is a schematic configuration diagram of a laser beam printer which is an example of an image forming apparatus provided with a discharge sheet stacking device according to a first embodiment of the present invention, and FIG. is there. 1 and FIG.
The same reference numerals as 0 indicate the same or corresponding parts.

In FIG. 1, reference numeral 100 denotes a laser beam printer main body (hereinafter, referred to as main body), 1 denotes a rotating drum type electrophotographic photoconductor (hereinafter, referred to as photoconductor drum) as an image carrier, 2 denotes a primary charger, 3 Is a laser scanner, 4
Denotes a developing device, and 23 denotes a cleaning device. Reference numeral 20 denotes a paper feed cassette for storing the recording material P, which is a sheet; 21, a paper feed roller; 22, a registration roller pair; and 5, a transfer roller.

When forming an image in the laser beam printer having such a configuration, first, the surface of the photosensitive drum 1 is uniformly charged by the primary charger 2 during the rotation process. Next, the charged surface of the photoreceptor drum 1 is scanned and exposed by a laser beam L output from a laser scanner 3 after being modulated according to a time-series electric digital pixel signal of target image information. An electrostatic latent image corresponding to the image information is formed. next,
The electrostatic latent image is reversal-developed (toner adheres to the laser-exposed portion) with the negative toner T1 by the developing device 4 to be visualized.

On the other hand, the recording material P is separated and fed from the inside of the paper feeding cassette 20 by the paper feeding roller 21, and thereafter, the pressure contact nip between the photosensitive drum 1 and the transfer roller 5 via the registration roller pair 22. The toner image on the photosensitive drum 1 is sequentially transferred to the surface of the recording material P by being conveyed and introduced into the transfer unit, which is a unit, at a predetermined timing.

Next, the recording material P that has passed through the transfer section is separated from the surface of the photosensitive drum 1 and is conveyed to the image heating device 7 to undergo a fixing process of the transferred toner image. It is discharged outside. On the other hand, the surface of the photosensitive drum 1 after the separation of the recording material is cleaned by the cleaning device 23 after removal of the remaining contaminants such as toner remaining after transfer, and the work is repeatedly performed.

The photosensitive drum 1, the primary charger 2, the developing device 4, and the cleaning device 23 shown in the present embodiment.
The two process devices are collectively configured as a process cartridge 24 that can be freely attached to and detached from the main body and exchangeable.

The image heating device 7 has a heater 14, a heater support 10, a fixing film 9, a flange member 15, and a pressure roller 11, as shown in FIG. Note that, in the present embodiment, the heater 14
AgPd, TA ₂ N, R formed on a heat-resistant, insulating, high-thermal-conductivity alumina substrate by screen printing, for example.
The fixing film 9 has a thin-film heating resistor portion made of uO ₂ , TaSiO ₂ , nichrome or the like, and a surface facing the inner surface of the fixing film 9 is overcoated with heat-resistant glass or the like.

The fixing film 9 is a single-layer film having heat resistance, toner release property, and toughness, or a composite layer film subjected to a desired surface treatment or lamination treatment. Is a polyimide (PI) film, heat-treated 50 μm Zn
O monolayer film or tetrafluoroethylene (PTF
It is a composite layer film subjected to the release property imparting treatment in E). Reference numeral 8 denotes a cover on the apparatus for preventing the user from touching the components of the apparatus that become hot.

Here, in the image heating device 7 having such a configuration, for example, the heater 1 is now interposed with the fixing film 9 interposed therebetween.
4 and the pressure roller 11 are in a pressure contact state with a predetermined pressing force (for example, an A4 width and a total pressure of 4 to 12 kg), and in this state, the pressure roller 11 is moved in a counterclockwise direction indicated by an arrow by driving means (not shown). When the fixing film 9 is rotated, the fixing film 9 is rotated by the rotation of the pressure roller 11 as described above, whereby the fixing film 9 is driven to rotate around the heater support 10 in a clockwise direction as indicated by an arrow. .

In the state where the fixing film 9 is rotated and the heater 14 is heated to a predetermined temperature (for example, 150 deg or more) by energizing the heating resistor, the unfixed toner image is When the recording material P carrying T is conveyed, the recording material P moves through the heating nip portion N together with the fixing film 9, and the recording material P is heated by the heater 14 via the film 9 in the heating nip portion N,
The unfixed toner image T on the recording material P is softened and fused.

Incidentally, in FIG.
A discharge roller 41 that forms a discharge nip together with the roller 51; a discharge upper guide 50 that rotatably holds the roller 51 and guides above the recording material P; and a discharge roller that is driven by driving means (not shown). And a lower discharge guide 40 for guiding the recording material P below the recording material P.

The recording material P on which the toner image T has been softened and melted and fixed passes through the heating nip N and is separated from the film surface. It is discharged outside the main body.

That is, the recording material P separated from the film surface
Is guided by the lower discharge guide 40 and conveyed to a discharge nip formed by the rollers 51 and the discharge rollers 41, and then nipped and conveyed by the rollers 51 and the discharge rollers 41. The paper is guided by the guide 40 and is discharged from the paper discharge port 71 to the outside of the main body.
The upstream side of the discharge nip of the interval formed by the upper discharge guide 50 and the lower discharge guide 40 is gradually narrowed so that the recording material P can be easily and stably introduced into the discharge nip. It is configured.

On the other hand, in the drawing, reference numeral 60 denotes a stacking tray which is a sheet stacking means which is inclined so that the downstream side of the discharge sheet stacking device 110 disposed below the sheet discharge port 71 is higher. The discharged recording material P is stacked on the stacking tray 60. The stacking tray 60 is held openably and closably on the main body 100 with a pivot 60a provided on the side wall surface of the main body 100 as a fulcrum. When used, the loading tray 60 is shown with the pivot 60a as a fulcrum in FIG. It is designed to be used with it opened to the position.

In the opened state, the stacking tray 60 is provided with a number of recording materials P corresponding to the distance between the pivot-side end of the stacking tray 60 and the lower end of the discharge port 71. Are to be stacked.

A frame 30 is provided with a flange member 15, a pressure roller 11, an upper discharge guide 50, and a lower discharge guide 40, as shown in FIG.

In the drawing, reference numeral 61 denotes a convex member which is a support member provided on the stacking tray 60, and the recording member moves downstream along the stacking surface 60a of the stacking tray 60 by the convex member 61 in the discharge direction. The material P is supported from below.

By the way, this convex member 61 is inclined to the downstream side in the discharge direction in which the recording material P first comes into contact with the leading end of the discharged recording material P and moves in the direction along the loading surface 60a of the loading tray 60. It has a guide surface 61a.

The recording material P is directed in the direction along the stacking surface 60a of the stacking tray 60 by the guide surface 61a as described above, that is, the recording material P is not directly contacted with the stacking tray 60, but is recorded. By moving the loading tray 60 at an angle θ ₂ that is shallower than the angle θ ₁ when the material P directly contacts the loading tray 60,
The frictional resistance can be reduced without tilting in the horizontal direction.

The angle θ ₂ is preferably approximately の of the angle θ ₁ when the recording material P directly contacts the stacking tray 60.

As described above, the convex member 61 having the guide surface 61a is provided on the stacking tray 60 to reduce the frictional resistance and to move the recording material P while supporting the recording material P from below. Even when the recording material P such as a thin sheet of paper or an OHT sheet that has been heated by the fixing unit and has low rigidity is discharged, the recording material
It is possible to prevent the buckling by falling into the gap with 00.

Thus, it is possible to prevent the recording material P from being damaged, the alignment of the recording material P stacked on the stacking tray 60 from being disturbed, and the occurrence of a jam.

Next, a second embodiment of the present invention will be described.

FIG. 4 is a schematic diagram of a main part of a laser beam printer as an example of an image forming apparatus provided with a discharge sheet stacking device according to the present embodiment, and FIG. 5 is a partially cutaway perspective view of the main part. . 4 and 5, the same reference numerals as those in FIGS. 2 and 3 indicate the same or corresponding parts.

4 and 5, reference numeral 60c denotes a concave portion formed in the loading tray 60, and 61A denotes a recess formed in the loading tray 60.
One end of the support member 61 </ b> A is held by the loading tray 60 via a rotating shaft 60 d provided in the recess 60 c of the loading tray 60 so as to be freely retractable.

Here, the support member 61A supports the recording material P projecting from the stacking tray 60 and moving downstream along the stacking surface 60a of the stacking tray 60 in the discharge direction from below. 61A has a guide surface 61a inclined to the downstream side in the discharge direction in which the recording material P first comes into contact with the leading end of the discharged recording material P and is directed in a direction along the loading surface 60a of the loading tray 60. .

By moving the recording material P in the direction along the loading surface 60a of the loading tray 60 with the guide surface 61a and moving the recording material P while supporting the recording material P from below as described above, there is no stiffness. Even when the recording material P such as a thin paper or an OHT sheet that has been heated by the fixing unit and has low rigidity is discharged, the recording material P can be prevented from buckling.

Reference numeral 62 denotes a recess 60 of the stacking tray 60.
c is a coil spring that is an example of an elastic member that is an urging member that urges the support member 61A from below so as to project the support member 61A from the stacking tray 60.

Here, the urging force of the coil spring 62 is
When the number of recording materials P stacked on the stacking tray 60 reaches a predetermined stackable number, the support member 61A is rotated by the weight of the recording material P to a position that matches the stacking surface 60b of the stacking tray 60. Is set. In FIG. 4, reference numeral 60d denotes a support member moving end through hole formed in the bottom surface of the concave portion so that the support member 61A can rotate to a position coinciding with the loading surface 60b of the loading tray 60.

The support member 61A is provided on the loading tray 60 so as to be able to protrude and retract, and the support member 61A
Of the stacking tray 60 by the weight of the recording material P.
By rotating to a position that matches
Even when the support member 61A is provided, it is possible to prevent a decrease in the maximum stackable number of the recording materials P.

When the recording materials P are sequentially stacked on the stacking tray 60, the support member 61A gradually moves into the concave portion due to the weight of the recording material P. Since the recording material P is loaded on the support member 61A, even if the support member 61A moves, the recording material P discharged thereafter will remain on the support member 61A.
The recording material P stacked on the stacking tray 60 moves in the direction along the stacking surface 60a of the stacking tray 60 and is supported.

Here, the recording material P previously loaded on the loading tray 60 has reached near the lower end of the paper discharge port 71 as shown in FIG. 6, and thereafter, the recording material P loaded earlier is loaded. The recording material P1 moving along the stacking tray 60 and the main body 10
It does not fall into the gap with zero. Further, a contact portion of the recording material P1 with the recording material P stacked thereon and a roller 51
Because the distance between the nip portion of the recording material P1 and the discharge roller 41 is short, the stiffness of the recording material P1 is also prevented from dropping.

Thus, buckling of the recording material P can be prevented even when the support member 61A moves as the amount of the recording material P loaded increases.

In the concave portion 60c of the stacking tray 60 thus configured, for example, as shown in the figure, a micro switch 64 which is a detecting means for detecting the displacement of the support member 61A is provided, and the support member 61A is loaded. When moving to the stacking surface 60b of the tray 60, that is, when the number of the recording materials P reaches the stackable number, specifically, the support member 61A
May be connected to a controller board (not shown) when the moving end of the micro switch 64 operates the micro switch 64.

With this configuration,
The main body 100 can detect the full loading of the loading tray 60, and when it is further full, if the program is programmed to stop the printing operation, the overloading of the recording material P due to a user error or the like, and the loading of the recording material P Falling from tray 60,
The occurrence of jams and the like can be prevented.

On the other hand, in the above description, the case where the coil spring 62 is used as the urging member for urging the stacking tray 60 has been described. However, the present embodiment is not limited to this. For example, FIGS. As shown, a winding spring 63 may be used.

When the number of recording materials P stacked on the stacking tray 60 reaches the stackable number similarly to the coil spring 62 described above, the urging force of the winding spring 63 is increased.
1A is set so as to be pushed by its own weight of the recording material stacked on the stacking tray 60 to rotate to a position coinciding with the stacking surface 60b of the stacking tray 60.

Then, with this configuration,
It is possible to prevent a decrease in the maximum stackable number of the recording materials P, and when the number of the recording materials P stacked on the stacking tray 60 is small, the support member 61A is attached to the stacking surface 6 of the stacking tray 60.
0b, so that buckling of the recording material P can be prevented. Further, as the loading amount of the recording material increases, even when the support member 61A moves, the recording material P
Buckling can be prevented.

Furthermore, when the coil spring 63 is used, the stacking tray 60 can be made thinner and more compact than when the coil spring 62 is used. By making the stacking tray 60 thin and compact in this manner, the distance between the pivot-side end of the stacking tray 60 and the lower end of the paper discharge port 71 can be increased, and the recording material P The loading capacity can be increased.

Next, a third embodiment of the present invention will be described.

FIG. 9 is a schematic diagram of a main part of a laser beam printer which is an example of an image forming apparatus provided with a discharge sheet stacking device according to the present embodiment. In FIG. 9, the same reference numerals as those in FIG. Or a corresponding part is shown.

In the figure, 100A is a main body, and this main body 100A has an upper outlet 72 in addition to the outlet 71 described above. Reference numeral 73 denotes a discharge roller that rotates counterclockwise in the figure by a driving unit (not shown), and reference numeral 74 denotes a roller that is pressed against the discharge roller 73 and is driven to rotate.

Then, as described later, the discharge roller 73
The recording material P guided to the press-contact nip portion of the roller 74 and the roller 74 is rotated by the paper discharge roller 73 and the roller 74 to form an upper discharge port 72.
After the paper is discharged from the paper stacking unit 75, the paper is stacked on the paper discharge stacking unit 75.

By the way, in FIG.
0 is closed, but when the loading tray 60 is closed in this way, the loading tray 60 and the main body 1 are closed.
00A, specifically, a recording material transport path R is formed between the stacking tray 60 and the upper discharge guide 50.

Further, when the stacking tray 60 is closed in this manner, the convex member 61 on the stacking tray 60 enters the inside of the discharge port 71 as shown in FIG. The recording material P nipped and transported by the rollers 51 and the discharge rollers 41 is guided by the recording material transport path R by the convex member 61 that has entered.

Thus, when the stacking tray 60 is closed, the recording material P is guided by the convex member 61 and enters the recording material transport path R formed between the stacking tray 60 and the upper discharge guide 50. Thereafter, the sheet is guided to the press-contact nip portion between the sheet discharging roller 73 and the roller 74, and thereafter, is discharged from the upper discharge port 72 by rotation of the sheet discharging roller 73 and the roller 74, and is stacked on the sheet discharging stacking section 75.

As described above, the recording material transport path R is formed by closing the stacking tray 60, and the convex member 61 provided on the stacking tray 60 can be used as a guide to the discharge stacking section 75. Thus, in an image forming apparatus having a plurality of stacking units, the discharge path switching unit, which is provided exclusively in the related art, can be omitted, and the cost can be reduced.

The convex member 61 and the support members 61 and 61A in each of the embodiments described above are made conductive members, and a voltage of the same polarity as that of the recording material P is applied by a power source (not shown). Convex member 61 and support member 6
A repulsive force may be generated between the recording material P and the recording material P, and a lift may be applied to the recording material P by the repulsive force. Thereby, the convex member 61 and the support members 61, 61
The frictional force between A and the recording material P is reduced, and the buckling of the recording material P can be more effectively prevented.

[0076]

As described above, according to the present invention, when a discharged sheet is stacked on the sheet stacking means, the sheet is moved in a direction along the sheet stacking means while the sheet is supported from below by the support member. be able to. This makes it possible to prevent buckling of the sheet without expanding the installation area even when discharging a sheet of thin rigid paper or a sheet of OHT or the like, which is heated by the fixing means and has low rigidity, without increasing the installation area. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a laser beam printer which is an example of an image forming apparatus including a discharge sheet stacking device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a main part of the laser beam printer.

FIG. 3 is a partially cutaway perspective view of a main part of the laser beam printer.

FIG. 4 is a schematic configuration diagram of a main part of a laser beam printer as an example of an image forming apparatus including a discharge sheet stacking device according to a second embodiment of the present invention.

FIG. 5 is a partially cutaway perspective view of a main part of the laser beam printer.

FIG. 6 is a schematic configuration diagram of a main part of a laser beam printer according to another example of the above embodiment.

FIG. 7 is a schematic diagram of a main part of a laser beam printer according to another example of the above embodiment.

FIG. 8 is a partially cutaway perspective view of a main part of a laser beam printer according to another example of the above embodiment.

FIG. 9 is a schematic diagram illustrating a main part of a laser beam printer as an example of an image forming apparatus including a discharge sheet stacking device according to a third embodiment of the present invention.

FIG. 10 is a schematic configuration diagram of a main part of a conventional image forming apparatus.

[Explanation of symbols]

 Reference Signs List 60 loading tray 60b loading surface 61 convex member 61, 61A support member 61a guide surface 62 coil spring 63 winding spring 64 micro switch 71 discharge port 72 upper discharge port 100, 100A laser beam printer main body 110 discharge sheet loading device P recording material

Claims (9)

[Claims] A discharge sheet stacking device for stacking sheets discharged from a discharge port on a sheet stacking means inclined so that a downstream side is higher; A discharge sheet stacking device, comprising: a guide surface that faces in a direction along sheet stacking means; and a support member that supports the moving sheet from below. 2. The apparatus according to claim 1, wherein said support member is provided so as to be able to protrude and retract from said sheet stacking means, and is urged by an urging means so as to protrude from said sheet stacking means. Discharge sheet loading device. 3. The guide surface guides the sheet such that, when the sheet comes into contact with the sheet stacking means, the sheet comes into contact at a smaller angle than when the sheet comes into direct contact with the sheet stacking means. The discharged sheet stacking device according to claim 1 or 2, wherein: 4. The discharge sheet stacking apparatus according to claim 2, wherein said urging means is an elastic member interposed between said sheet stacking means and said support member. 5. The discharge sheet according to claim 2, wherein the urging means is an elastic member attached to a shaft provided on the sheet stacking means so as to hold the support member so as to be able to protrude and retract. Loading device. 6. The discharged sheet stacking apparatus according to claim 2, further comprising a detecting unit for detecting an amount of displacement of the support member, and controlling discharge of the sheet based on a detection signal from the detecting unit. 7. The discharge sheet stacking apparatus according to claim 1, wherein the supporting member is formed of a conductive member, and a voltage having the same polarity as that of the sheet is applied to the supporting member. . 8. A discharged sheet stacking apparatus configured to discharge an image formed by an image forming unit and a sheet formed by the image forming unit from a discharge port, and to stack the sheet on a sheet stacking unit that is inclined such that the downstream side is higher. An image forming apparatus comprising: the discharged sheet stacking device according to any one of claims 1 to 7; 9. An image forming apparatus according to claim 8, further comprising: providing another discharge port, opening and closing the sheet stacking means, and closing the sheet stacking means so that the support member enters the discharge port. 9. The image forming apparatus according to claim 8, wherein the sheet stacking means forms a conveyance path which serves as a guide for conveying the sheet to the other discharge port by using the support member that has entered the discharge port.