JPH11222346A - Image forming device and static eliminator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce installation area and prevent an image failure. SOLUTION: A sheet P with a toner image T fixed is discharged to the outside of a body by a discharging means 70 and stacked on a stacking means 60, while a grounded static eliminating means 41 is brought into contact with the sheet P before discharging the sheet P so as to eliminate the electrostatic charge of the sheet P. In addition, an electric resistance 41R with the specified electric resistance value is provided between the static eliminating means 41 and a ground part G of the static eliminating means 41 so as to prevent the adhesion or the like of toner to the static eliminating means 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile, etc., for forming an image by an electrophotographic method, and more particularly, to a neutralization of a sheet on which an image is formed.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus for forming an image by an electrophotographic method, an electrostatic latent image is formed on an image carrier, and after the electrostatic latent image is visualized with toner, the image is formed on a sheet. There is a configuration in which a toner image is fixed on a sheet by transferring and then heating the toner.

Such an image forming apparatus is disclosed in, for example, JP-A-63-313182,
-263679, JP-A-2-15778, JP-A-4-44075-44083, 204980
JP-A-204984 discloses an image forming apparatus having a film heating type image heating means.

Here, the image heating means is a substantially planar heater having a heat-generating portion, a heat-resistant film member, and presses the heater with the heat-resistant film member interposed therebetween to form a heating nip portion. In addition to a pressure roller, a material to be heated (sheet) is introduced into a heating nip portion, and the material to be heated is heated by heat of a heater via a heat-resistant film.

[0005] Such an image heating means is capable of intensively heating the heating nip by using a heater having a low heat capacity and a rapid rise in temperature, and has features such as quick start and power saving. I have. The heating element (heater) having a low heat capacity and a fast temperature rise includes a ceramic material substrate having heat resistance, insulation, and good thermal conductivity, and an energized heat generated by printing or firing on the ceramic material substrate. A ceramic heater that has a heating resistor as a part and supplies power to the heating resistor to generate heat is mainly used.

[0006] Such a film heating type image heating means is, for example, a copying machine, a laser beam printer,
2. Description of the Related Art In an image forming apparatus such as a facsimile, a micro film reader printer, an image display (display) apparatus, and a recording machine, a suitable image forming process such as electrophotography, electrostatic recording, magnetic recording, or the like is made of a heat-meltable resin. An unfixed toner image corresponding to the target image information formed indirectly (transferred) or directly on the surface of a recording medium (transfer material sheet, electrofax sheet, electrostatic recording sheet, printing paper, etc.) using toner Is used as an image fixing device for performing a heat fixing process as a permanent fixed image.

On the other hand, FIG. 10 is a diagram showing a schematic configuration of a main part of a conventional image forming apparatus, that is, a film heating type image heating means and a stacking means for stacking discharged recording materials.
This image heating means is the same as that described in JP-A-4-4407.
JP-A-5-44083, JP-A-204980-2049
No. 84, etc., in which a cylindrical film is used as a heat-resistant film, and the cylindrical film is rotationally driven by a pressing roller as a pressing means, a pressure roller driving method, a tension-free type (film That drives the film without applying tension to the film).

In FIG. 1, 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 type heater support having a substantially semicircular cross section and also serving as a film guide. A heater 14 is fixedly supported at the center of the lower surface of the heater support 10 by 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 a pressure roller having elasticity,
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 adapted to be rotated in the counterclockwise direction indicated by an arrow by a driving means (not shown) during image formation, and thus the pressure roller 11 is rotated. Then, the film 9 is pressed by the pressing frictional force between the pressure roller 11 and the film 9 at the heating nip portion N.
Generates a rotational force. As a result, the film 9 is driven to rotate clockwise as indicated by the arrow around the outer periphery of the heater support 10 also serving as a guide for the film 9 while sliding the inner surface of the film 9 into contact with the lower surface of the heater 14.

In a state where the film 9 is rotated and the heater 14 generates heat by energization and the temperature is controlled to a predetermined temperature, the gap between the film 9 of the heating nip N and the pressure roller 11 is increased. Then, when the recording material P as the material to be heated carrying the unfixed toner image T is introduced with the toner image surface facing the film 9, the recording material P moves through the heating nip N together with the film 9. .

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

In this image heating means, when the film 9 is rotated by the driving of the pressure roller 11, substantially no tension acts on the film 9 except for the heating nip portion N. There are advantages in that the film-side moving force along the length of the heater support 10 due to the rotation of the film is small, the film-side moving control means can be simplified, the ease of assembly and the cost can be reduced.

By the way, after being separated from the film surface in this way, the recording material P is discharged outside the main body, and the recording material P is discharged.
Are stacked on a tray member 60 serving as a stacking unit. The installation area of the image forming apparatus can be reduced by making the loading surface angle of the tray member 60 acute.

[0016]

However, in such a conventional image forming apparatus, the mounting area of the image forming apparatus can be reduced by making the loading surface angle of the tray member 60 acute, but the charging area can be reduced. In the case of the recording material P which is easy to be processed, for example, the leading end of the discharged recording material P may adhere to the tray member 60 as shown in FIG. Can not be discharged and loaded.

Accordingly, the recording material P which is easily charged is
In some cases, a ground electrode is provided to eliminate static electricity. But,
When the ground electrode is provided in this manner, the charged toner scattered in the atmosphere or inside the apparatus adheres and accumulates on the ground electrode during a jam process or the like near the image heating unit.
When the charged toner is transferred to the recording material P, the quality of the output recording material P is significantly deteriorated.

When a ground electrode is provided, in a high-temperature and high-humidity environment, when the moisture content of the recording material P is large, the transfer charge supplied to the back surface of the recording material P at the transfer section is reduced.
It is easy to leak by transmitting the creeping surface. When the transfer charge leaks as described above, the holding power of the toner image T transferred and formed on the recording material P is lost, and an image defect occurs due to the insufficient holding power of the toner image T. In particular, in the case of a small-sized image forming apparatus, since the distance between the image heating unit and the stacking unit is short, image defects due to a leak transmitted along a creepage surface are remarkable.

On the other hand, when the stacking surface angle of the tray member 60 is set to an angle close to horizontal so as to prevent the recording material P from sticking to the tray member 60, the above problem can be prevented. The area cannot be reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide an image forming apparatus capable of reducing an installation area and preventing an image defect. I do.

[0021]

According to the present invention, an electrostatic latent image is formed on an image carrier, the electrostatic latent image is visualized with toner, and then transferred to a sheet. In an image forming apparatus in which the toner image is fixed on the sheet by heating and the sheet is discharged to the outside of the main body, a discharging unit for discharging the sheet on which the toner image is fixed to the outside of the main body, and the discharging unit A stacking unit for stacking the discharged sheet, a grounding unit that contacts the sheet before discharging to the stacking unit and grounds the sheet, and a grounding unit between the neutralizing unit and a grounding unit of the neutralizing unit. And an electric resistor having a predetermined electric resistance value provided in the electronic device.

Further, the present invention is characterized in that the discharging means includes a rotating member formed of a conductive member while discharging the sheet to the outside of the main body, and the rotating member constitutes the static elimination means. It is.

Further, the present invention is characterized in that the rotating member is formed to have the predetermined electric resistance value, and the rotating member is configured to also serve as the electric resistance.

Further, in the present invention, the discharging means is formed by a rotating member for discharging the sheet to the outside of the main body and a conductive member, while guiding the sheet to the rotating member and passing the rotating member. And a guide member for guiding a sheet to the stacking means, wherein the guide member constitutes the static elimination means.

Further, the present invention is characterized in that the guide member is formed to have the predetermined electric resistance value, and the guide member is configured to also serve as the electric resistance.

According to the present invention, the discharging means includes a rotating member for discharging the sheet to the outside of the main body, and a guide for guiding the sheet to the rotating member and guiding the sheet passing through the rotating member to the stacking means. And the guide member is provided with the charge removing means.

According to the present invention, the static elimination means is a guide piece formed of a conductive member.

Further, the present invention is characterized in that the charge removing means is a brush-like electrode member.

Further, according to the present invention, the predetermined electric resistance value is 1
It is characterized by being between kΩ and 400 MΩ.

Further, as in the present invention, the sheet on which the toner image has been fixed is discharged to the outside of the main body by the discharging means and is stacked on the stacking means, and before discharging the sheet, the grounded discharging means is brought into contact with the sheet. By doing so, the sheet is neutralized. Further, by providing an electric resistance having a predetermined electric resistance value between the neutralizing unit and the grounding portion of the neutralizing unit, it is possible to prevent toner from adhering to the neutralizing unit.

[0031]

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 the image forming apparatus according to the first embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 10 indicate the same or corresponding parts.

In FIG. 1, reference numeral 100 denotes a laser beam printer main body (hereinafter, referred to as a main body), 1 denotes a rotating drum type electrophotographic photoreceptor (hereinafter, referred to as a photoreceptor 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 an image is formed 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, one sheet of recording material P is separated and fed from a sheet feeding cassette 20 by a sheet feeding roller 21, and then a pressure nip between the photosensitive drum 1 and the transfer roller 5 via a pair of registration rollers 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 an image heating device (image heating means) 7 to undergo a fixing process of a transferred toner image. Thereafter, the print is discharged outside the main body. 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 is of the tension-free type film heating system shown in FIG. 10 described above, and includes a heater 14, a heater support 10, a fixing film 9, Flange member 1
5, a pressure roller 11.

In this embodiment, the heater 1
No. 4, AgPd, TA 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 2N, RuO 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 laminating 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).

Numeral 8 denotes an upper cover for preventing the user from touching the components of the device that become hot.
Reference numeral 30 denotes a frame on which the flange member 15, the pressure roller 11, and an upper discharge guide 50 and a lower discharge guide 40 to be described later are disposed.

Here, in the image heating apparatus 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 film 9 is rotated, a rotation force acts on the film 9 by the rotation of the pressure roller as described above, whereby the film 9 is driven to rotate around the heater support 10 in the clockwise direction as indicated by an arrow.

When 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 placed in the heating nip N. 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 melt-fixed passes through the heating nip portion N, is separated from the film surface, and is then discharged to the outside of the main body by the discharge means 70. You.

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. It is guided by the guide 40 and discharged out 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.

By the way, the discharge roller 41, which is a rotating member, is made of metal, carbon black, conductive metal fine powder,
It is formed of a conductive member such as a resin composition or a rubber composition containing a conductive fine powder such as a conductive metal oxide fine powder, and is grounded as shown in FIG. When the recording material is discharged, the discharge roller 4 is brought into contact with the recording material P.
By grounding 1, the discharge roller 41 serves as a ground electrode for the recording material P, and constitutes a static eliminator for eliminating the charge of the recording material P.

By discharging the recording material P by the discharge roller 41 constituting the discharging means as described above, it is possible to prevent the recording material P from sticking to the loading surface of the tray member 60. Can be made acute, and the installation area of the laser beam printer (image forming apparatus) can be reduced.

On the other hand, between the discharge roller 41 and the ground surface G of the discharge roller 41, an electric resistance 41R having a predetermined electric resistance value as described later is provided. By providing the electric resistance 41R between the discharge roller 41 and the ground plane G in this way, it is possible to prevent toner from adhering to the discharge roller 41. Furthermore, it is possible to prevent the transfer charge from leaking, thereby preventing image defects due to insufficient holding power of the toner image T.

For example, as shown in FIG. 3, if the discharge roller 41 is formed such that the discharge roller itself has an electric resistivity 41R 'having the same resistance value as the electric resistance 41R, the discharge roller 41 has an electric resistance 41R. Therefore, it is possible to prevent toner from adhering to the discharge roller 41 at a low cost, and to prevent image defects due to insufficient holding power of the toner image T.

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

FIG. 4 is a schematic diagram of a main part of the image forming apparatus according to the present embodiment. 2, the same reference numerals as those in FIG. 2 indicate the same or corresponding parts.

In the figure, reference numeral 41a denotes a discharge roller 41.
It is. In the present embodiment, the discharge roller 41a does not need to be formed of a conductive member.

40A was formed of a conductive member such as a resin composition or a rubber composition containing conductive fine powder such as metal, carbon black, conductive metal fine powder, and conductive metal oxide fine powder. It is a discharge lower guide which is a guide member,
The lower discharge guide 40A is grounded. Here, when the recording material is discharged in this manner, the recording material P
The lower discharge guide 40A, which guides the recording material P to the tray member 60, is grounded, so that the lower discharge guide 40A serves as a ground electrode for the recording material P, and constitutes a static elimination means for eliminating the charge of the recording material P.

By discharging the recording material P by the discharging lower guide 40A constituting the discharging means as described above, it is possible to prevent the recording material P from sticking to the loading surface of the tray member 60. The loading surface angle of 60 can be made acute, and the installation area of the image forming apparatus can be reduced.

Further, an electric resistance 40R having a predetermined electric resistance value is provided between the lower discharge guide 40A and the ground plane G as described later. By providing the electric resistance 40R in this manner, the lower discharge guide 40 is provided.
It is possible to prevent the toner from adhering to A, and to prevent the transfer charge from leaking, thereby preventing image defects.

If the lower discharge guide 40A is formed such that the lower discharge guide itself has the same electric resistance 40R 'as the electric resistance 40R, as shown in FIG. The resistance 40R can also be used, so that toner can be prevented from adhering to the lower discharge guide 40A at a low cost, and an image defect due to insufficient holding power of the toner image T can be prevented.

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

FIG. 6 is a schematic configuration diagram of a main part of the image forming apparatus according to the present embodiment, and FIG. 7 is a partially cutaway perspective view of the main part. In FIGS. 6 and 7, the same reference numerals as those in FIGS. 2 and 4 indicate the same or corresponding parts.

In FIGS. 6 and 7, reference numeral 42 denotes a guide piece provided on the discharge lower guide 40 upstream of the discharge nip of the rollers 51 and the discharge rollers 41 and guiding the fused and fixed recording material P to the discharge nip. Is a metal guide member.

Here, the metal guide member 42 is grounded. When the recording material is discharged, the metal guide member 42 that contacts the recording material P is grounded, so that the metal guide member 42 is grounded. , And constitutes a static eliminator for neutralizing the recording material P.

By removing the charge of the recording material P by the metal guide member 42 constituting the charge removing means in this way, it is possible to prevent the recording material P from sticking to the stacking surface of the tray member 60, and thereby the tray member The loading surface angle of 60 can be made acute, and the installation area of the image forming apparatus can be reduced.

Further, an electric resistor 42R having a predetermined electric resistance value is provided between the metal guide member 42 and the ground plane G as described later. By providing the electric resistance 42R in this way, the metal guide member 4
2 can be prevented from adhering, and a transfer charge can be prevented from leaking, thereby preventing an image defect.

In this way, by configuring the recording material P to be guided by the metal guide member 42, the material of the discharge lower guide 40 can be made of an inexpensive general resin material instead of an expensive heat-resistant engineering plastic material. It becomes possible and costs can be reduced.

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

FIG. 8 is a schematic diagram of a main part of an image forming apparatus according to the present embodiment, and FIG. 9 is a partially cutaway perspective view of the main part. 8 and 9, the same reference numerals as those in FIGS. 2 and 4 denote the same or corresponding parts.

8 and 9, reference numeral 80 denotes a roller 51 and a discharge roller 41 of the lower discharge guide 40 as a guide member.
A brush electrode member 81 is provided on the downstream side of the discharge nip and contacts the lower surface of the recording material P on which the fusion and fixing has been performed. The brush electrode member 81 fixes the brush electrode member 80.

Here, the brush electrode member 80 is grounded via a brush electrode holder 81. Thus, when the recording material is discharged, the brush electrode member 80 abuts on the recording material P.
Is grounded, so that the brush electrode member 80
, So that the recording material P can be neutralized. In the present embodiment, the brush electrode member 80 is a low-rigidity brush member. By making the brush electrode member 80 have such a low rigidity, the brush electrode member 80 can be reliably brought into contact with the recording material P. Has become.

By removing the charge of the recording material P by the brush electrode member 80 as described above, the tray member 60 is removed.
The recording material P can be prevented from sticking to the stacking surface of the tray member 60, whereby the angle of the stacking surface of the tray member 60 can be made acute, and the installation area of the image forming apparatus can be reduced.

Further, an electric resistor 80R having a predetermined electric resistance value is provided between the brush electrode member 80 and the ground plane G as described later. By providing the electric resistance 80R in this manner, the brush electrode member 8 is provided.
0 can be prevented from adhering to the toner, and image defects can be prevented by preventing the transfer charge from leaking.

By the way, in the first to fourth embodiments described above, the respective electric resistances 40R, 40R, 4
If the resistance value of 1R, 42R, 80R is 1KΩ or more,
Lower discharge guide 40, discharge roller 41, metal guide member 4
It has been found that image defects due to insufficient holding power of the toner image T due to toner adhesion and leakage to the brush electrode member 80 and the brush electrode member 80 can be prevented. Further, when the resistance value was 400 MΩ or less, the sticking of the recording material P to the loading surface of the tray member 60 could be prevented.

Therefore, the electric resistances 40R, 41R, 4
By setting the resistance values of 2R and 80R in the range of 1 KΩ to 400 MΩ, sticking of the recording material P and image defects can be prevented.

[0073]

As described above, according to the present invention, it is possible to prevent the sheet from sticking to the stacking unit by discharging the sheet before stacking the sheet on which the toner image is fixed on the stacking unit. it can. Thus, the loading surface angle of the loading means can be made acute, and the installation area of the image forming apparatus can be reduced. Further, by providing an electric resistor having a predetermined electric resistance value between the neutralizing unit and the grounding portion of the neutralizing unit, it is possible to prevent toner from adhering to the neutralizing unit and the like, thereby preventing image defects. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a laser beam printer as an example of an image forming apparatus 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 a laser beam printer according to another example of the first embodiment.

FIG. 4 is a schematic configuration diagram of a main part of an image forming apparatus according to a second embodiment of the present invention.

FIG. 5 is a partially cutaway perspective view of a main part of an image forming apparatus according to another example of the second embodiment.

FIG. 6 is a schematic configuration diagram of a main part of an image forming apparatus according to a third embodiment of the present invention.

FIG. 7 is a partially cutaway perspective view of a main part of the image forming apparatus according to the third embodiment.

FIG. 8 is a schematic diagram illustrating a main part of an image forming apparatus according to a fourth embodiment of the present invention.

FIG. 9 is a partially cutaway perspective view of a main part of the image forming apparatus according to the fourth embodiment.

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 photoconductor drum 7 image heating device 9 fixing film 14 heater 40, 40A lower discharge guide 41, 41a discharge roller 42 metal guide member 50 discharge upper guide 51 roller 60 tray member 70 paper discharge means 80 brush electrode member 81 brush electrode holder 40R , 41R, 42R, 80R Electric resistance 100 Main body P Recording material T Unfixed toner image

Claims (10)

[Claims] An electrostatic latent image formed on an image carrier;
An image forming apparatus in which the electrostatic latent image is visualized with toner, transferred to a sheet, and thereafter, the toner is heated to fix the toner image on the sheet, and the sheet is discharged outside the main body. A discharging unit that discharges the sheet on which the toner image is fixed to the outside of the main body; a loading unit that loads the sheet discharged by the discharging unit; and a discharging unit that contacts the sheet before being discharged to the loading unit. An image forming apparatus comprising: a grounded neutralizing unit configured to neutralize a sheet; and an electrical resistor having a predetermined electrical resistance value provided between the neutralizing unit and a ground portion of the neutralizing unit. . 2. The discharging device according to claim 1, wherein the discharging unit includes a rotating member formed of a conductive member while discharging the sheet to the outside of the main body, and the rotating member constitutes the charge removing unit. Image forming apparatus. 3. The image forming apparatus according to claim 2, wherein the rotating member is formed so as to have the predetermined electric resistance value, and the rotating member also serves as the electric resistance. 4. The discharging means is formed by a rotating member that discharges the sheet to the outside of the main body and a conductive member, and guides the sheet to the rotating member and removes the sheet that has passed through the rotating member. 2. The image forming apparatus according to claim 1, further comprising a guide member for guiding the stacking unit, wherein the guide member constitutes the charge removing unit. 5. The image forming apparatus according to claim 4, wherein said guide member is formed to have said predetermined electric resistance value, and said guide member is configured to also serve as said electric resistance. 6. The discharging means includes a rotating member for discharging the sheet to the outside of the main body, and a guide member for guiding the sheet to the rotating member and guiding the sheet passing through the rotating member to the stacking means. The image forming apparatus according to claim 1, wherein the guide member includes the charge removing unit. 7. The image forming apparatus according to claim 6, wherein said static elimination means is a guide piece formed of a conductive member. 8. The image forming apparatus according to claim 6, wherein said discharging means is a brush-shaped electrode member. 9. The predetermined electric resistance value is 1 kΩ to 400.
The image forming apparatus according to claim 1, wherein the value is MΩ. 10. A grounding means for contacting a sheet and discharging the sheet before discharging the sheet to a stacking means for stacking the sheet, and provided between the neutralizing means and a ground portion of the means for discharging the sheet. A static eliminator, comprising: an electric resistance having a predetermined electric resistance value.