JPH1039639A - Sheet separating device in image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate a sheet securely by a simple means inorder to separate the transferred sheet from a toner image forming medium. SOLUTION: A toner image is formed on a surface of an intermediate transfer belt 20d and a properly carried sheet 23 is pressure welded to the intermediate transfer belt 20d by a transfer roller 22. Reversal polar charge is applied to the transfer roller 22 by a power source 29 and the toner image is transferred on the sheet 23. A conductive separation plate 32 is mounted with its tip part slanted at a transfer part 20e so as to be adjacent to the transfer part 20e in order to separate the transferred sheet 23 by the transfer roller 22. Whereby, the tip of the separation plate 32 is disposed adjacent to the transfer part 20e and a tip part 23a of the sheet 23 is attracted by charge reversal polarity from charge of the sheet 23 caused on the tip and the sheet 23 is separated by the intermediate transfer belt 20d to separate.

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 in which a transfer member is disposed in a transfer section for transferring a toner image from a toner image forming medium to a sheet, and the transferred sheet is converted from a medium for forming a toner image. The present invention relates to a paper peeling device for peeling.

[0002]

2. Description of the Related Art In an image forming apparatus employing an electrophotographic system, a transfer member including a transfer roller for transferring a sheet by pressing a sheet against a toner image forming medium is used in addition to a corona transfer method using a transfer charger at a transfer portion. There is a method that employs a method of providing The transfer member transfers a toner image onto a sheet by pressing the sheet against a toner image forming medium such as a photoreceptor or an intermediate transfer medium with a transfer roller which is charged and rotated by power supply and is rotated. .

FIG. 3 shows an entire configuration of a full-color copying machine as an image forming apparatus employing the above transfer roller. Hereinafter, the configuration of the copying machine will be described with reference to FIG.

A document table 13 on which a document 12 is placed is provided on the upper surface of the apparatus frame 11. Device frame 11
A photoreceptor belt device 15 is disposed below the document table 13 via an optical system unit 14. The optical system section 14 scans the document 12 with light from a copy lamp 14a, and guides reflected light from the document 12 to an exposure section of the photoreceptor belt device 15. Note that the lens 14b of the optical system unit 14 has three lenses of blue, green, and red.
Since filters of various colors are provided, and the original 12 is scanned three times while replacing the filters, in the photoreceptor belt device 15, the exposure by the transmitted light is sequentially performed for each filter.

The photoreceptor belt device 15 includes a driving roller 15
The endless photoreceptor belt 15c is wrapped around a and the driven roller 15b, and the photoreceptor belt 15c is circulated and transported. The photoreceptor belt 15c has, for example, an organic photoreceptor (OPC) film formed on the outer surface of the belt. Further, around the photoreceptor belt device 15, a main charger 16, a developing device 17, a cleaner 18, a neutralizing lamp 19, and the like are arranged in the above-described order along the transfer direction of the photoreceptor belt 15c. This constitutes a photographic image forming process.

Accordingly, the reflected light from the document 12 guided through the optical system section 14 exposes the outer surface of the photoreceptor belt 15c charged by the main charger 16 so that the outer surface of the photoreceptor belt 15a is exposed. An electrostatic latent image is formed on the surface, and a toner image is formed when the developing device 17 develops the electrostatic latent image.

The developing device 17 has a developing tank in which toners of three colors of yellow, magenta, and cyan are loaded, and switches the developing tank to be used for each of the three scans of the document 12. Development is performed.
For this reason, on the photoreceptor belt 15c that is circulated and transferred,
Toner images of yellow, magenta, and cyan toners are sequentially formed. The colors of yellow, magenta, and cyan have complementary colors with blue, green, and red, respectively, in the filter of the lens 14b.

The portion of the photoreceptor belt device 15 where the photoreceptor belt 15c is wound around the driven roller 15b is a first transfer portion for transferring the toner image formed by the developing device 17 to the intermediate transfer belt device 20 side. 15d. In the intermediate transfer belt device 20, an endless intermediate transfer belt 20d is wrapped around a driving roller 20a, a driven roller 20b, and a backup roller 20c in a triangular shape, and the intermediate transfer belt 20d is circulated and transferred. The driving roller 20a and the driven roller 20b
The outer surface of the intermediate transfer belt 20d located between the first transfer portion 15d and the intermediate transfer belt 20d is pressed against the photosensitive belt 15c of the first transfer portion 15d. A first transfer roller 21 to which a power supply voltage for applying charges is applied is provided on an inner surface side of the intermediate transfer belt 20d pressed by the first transfer portion 15d.

Therefore, the toner image formed on the photoreceptor belt 15c in the photoreceptor belt device 15 is attracted by the electric charge of the first transfer roller 21 and is transferred onto the intermediate transfer belt 20d. The yellow, magenta, and cyan toner images formed on the photoreceptor belt 15c are sequentially superimposed and transferred on the intermediate transfer belt 20d to be full-color toner images.

The portion of the intermediate transfer belt device 20 where the intermediate transfer belt 20d is wound around the backup roller 20c forms a second transfer portion 20e for transferring the transferred toner image to the paper 23. A second transfer roller 23 to which electric charges are applied by power supply is disposed below the second transfer unit 20e. The second transfer roller 22 is provided so as to be able to move up and down, moves upward when the sheet 23 passes through the second transfer unit 20e, and places the sheet 23 on the outer surface of the intermediate transfer belt 20d that carries the toner image. It is designed to be pressed.

Therefore, the full-color toner image transferred onto the intermediate transfer belt 20d is transferred to the second transfer roller 22.
And is transferred onto the sheet 23 passing through the second transfer unit 20e. The outer surface of the intermediate transfer belt 20d after the completion of the transfer in this manner is cleaned by the cleaner 24 and returned to a state where a new toner image can be transferred. Further, the intermediate transfer belt 20 is slightly closer to the driven roller 20b than the second transfer portion 20e.
A grounded back electrode roller 28 is in contact with the inner surface of the intermediate transfer member d, so that a closed circuit of the charged charges is formed in the intermediate transfer belt device 20.

The sheet 23 is supplied to the second transfer portion 20e of the intermediate transfer belt device 20 by the photosensitive belt device 1.
5 is a sheet feeding unit 25 arranged below the sheet feeding unit 5. Here, two paper cassettes 26 can be attached to and detached from the apparatus frame 11, and the paper cassettes 26.
26, the sheet 23 is supplied. The sheet 23 that has passed through the second transfer unit 20 e is fixed by the fixing device 27 disposed on the side of the intermediate transfer belt device 20 so that the toner image is fixed, and is further discharged out of the device frame 11. It has become.

As described above, in the second transfer section 20e for transferring the toner image onto the paper 23, the transfer roller system uses the second transfer roller 22.

The transfer operation of the toner image in the second transfer section 20e will be described with reference to FIG.

The roller portion of the backup roller 20c is formed of insulating rubber such as silicon rubber.
The backup roller 20c rotates according to the circulating transfer of the intermediate transfer belt 20d. The second transfer roller 22 is formed of a conductive metal such as stainless steel. Then, the second transfer roller 22 is driven by a driving device of a paper transport system, and rotates in a direction opposite to that of the backup roller 20c. In addition, a charge is applied to the second transfer roller 22 by a power supply 29.
Here, assuming that the toner image on the intermediate transfer belt 20d is positively charged, a negative charge is applied to the second transfer roller 22 by the power supply 29 as shown in the figure.

When the sheet 23 passes through the second transfer section 20e, the sheet 23 is pressed against the outer surface of the intermediate transfer belt 20d by the second transfer roller 22. Then, the positively charged toner image is transferred onto the intermediate transfer belt 20d by the second transfer roller 22.
And is transferred to the sheet 23.

[0017]

However, the intermediate transfer belt 20d for transferring the positively charged toner image to the second transfer portion 20e itself has a positive charging tendency.
Moreover, the sheet 23 pressed by the second transfer roller 22 having a negative charge is negatively charged when passing through the second transfer unit 20e. For this reason, the second transfer unit 2
Since the leading end 23a of the sheet 23 passing through 0e is attracted to the side of the intermediate transfer belt 20d having a positive charging tendency as shown by an arrow A, there is a possibility that a peeling failure from the intermediate transfer belt 20d may occur. Note that this is the same even when the polarity of the charge is reversed.

Such a peeling defect is not limited to the above-described full-color copying machine, but includes a transfer roller-type transfer member configured to transfer a toner image from an intermediate transfer medium or a photosensitive member onto a sheet by a transfer roller. This is common to electrophotographic image forming apparatuses.

In the corona transfer method using a transfer charger instead of the transfer roller, for removing the sheet after the transfer, AC discharge is performed by a peeling charger, or the sheet is forcibly transferred to the intermediate transfer medium by a peeling claw. Or from the photoreceptor. However, if a peeling charger is used in the transfer roller system, the charge of the transfer roller is affected by the AC static elimination, and a transfer failure such as a striped toner image transferred to the paper occurs.

Further, in the method using the peeling claw, since the tip of the peeling claw comes into sliding contact with the intermediate transfer medium or the photosensitive member, it is required to use a material having high hardness for the intermediate transfer medium or the photosensitive member. It cannot be used for a flexible intermediate transfer medium such as the intermediate transfer belt 20d in the full-color copying machine. For this reason, it is difficult to adopt a paper peeling device that has been used in a conventional transfer unit using a corona charging method as a pressure-contact type transfer member such as a transfer roller.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a paper peeling apparatus which can easily peel paper from a toner image forming medium by simple means.

Another object of the present invention is to provide a transfer member for pressing a sheet against a toner image forming medium in order to transfer a toner image to the sheet, and to reliably perform peeling after transfer by the transfer member. It is in.

[0023]

According to the present invention, there is provided a sheet peeling apparatus for an image forming apparatus for achieving the above object, wherein a sheet is pressed against a toner image forming medium to form the sheet on the toner image forming medium. An image forming apparatus provided with a transfer member for transferring a toner image onto a sheet, a conductive member having a tip portion inclined toward the transfer member on a sheet discharge side of the transfer member at a position facing the toner image forming medium. Is established,
The leading end of the conductive member is made to approach the paper discharge side of the transfer member.

According to such a configuration, the sheet pressed against the toner image forming medium is attracted by the charge of the opposite polarity to the charge of the sheet generated on the conductive member after the transfer. That is, since the leading end of the sheet is immediately inclined after the transfer, the leading end of the conductive member can be disposed close to and close to the leading end of the conductive member. Can be efficiently separated.

Therefore, in the peeling device having the above-described configuration, if the conductive member is grounded, a charge having a polarity opposite to the charge of the sheet is induced at the leading end of the conductive member via the grounding portion. The peeling of the sheet is promoted by the suction force due to the generated charges. In particular, since the leading end of the conductive member is disposed close to the transfer portion, a charge having a polarity opposite to the charge of the sheet is immediately induced, and the leading end of the sheet can be reliably separated.

Further, in the peeling apparatus having the above-mentioned structure,
The conductive member is provided with a shield member made of an insulating member so as to be interposed between the conductive member and the transfer member, and the shield member is provided so as to be inclined toward the paper discharge side of the transfer member. By doing so, the discharge action between the transfer member and the conductive member can be prevented. As a result, the transfer member for peeling the sheet is not affected by the conductive member, the transfer state is stabilized, and the transfer failure does not occur. In addition, since the shielding member is interposed, the tip of the inclined conductive member can be further brought closer to the transfer portion, and the effect of removing the sheet after transfer is further increased.

In order to achieve the object of the present invention, a sheet peeling device having a more specific structure is provided in which a sheet is pressed against a toner image forming medium so that the toner image formed on the toner image forming medium is transferred to the sheet. An image forming apparatus provided with a transfer member for transferring a toner image to a sheet, a power supply for transferring a toner image onto a sheet is connected to the transfer roller, On the paper discharge side of the transfer roller at a position facing the forming medium, a conductive member having a leading end portion inclined to the transfer member side and grounded is provided, and the leading end of the conductive member is placed on the paper discharge side of the transfer roller. In order to make them close to each other, a shielding member made of an insulating member is provided so as to be interposed between the conductive member and the transfer member.

According to this configuration, even if a conductive transfer roller is provided in order to transfer the toner image to the sheet efficiently, the discharge to the conductive member is blocked by the transfer roller, thereby increasing the transfer efficiency. At the same time, adsorption of the sheet to the toner image forming medium can be prevented, and the peeling effect can be enhanced. In other words, the transfer of the toner to the paper and the peeling action of the paper can be performed completely separately, and the respective actions become reliable.

[0029]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing details of a transfer section including a peeled portion, showing one embodiment of the present invention, and FIG. 2 is a front view of an intermediate transfer apparatus according to a toner image transfer medium provided with the transfer section. . FIG. 3 is a diagram showing the internal structure of a full-color copying machine as an example of the image forming apparatus described in the section of the prior art. FIG. 3 includes a transfer unit and a peeling unit having the structure shown in FIGS. 1 and 2.

Therefore, in one embodiment of the present invention, a description will be given of a sheet peeling apparatus applied to the full-color copying machine which is the image forming apparatus shown in FIG. The components having the same configuration and function shown in FIG. 3 and FIG.
2 and FIG.

The structure of the intermediate transfer belt device 20 in a full-color copying machine will be described with reference to FIG.

The intermediate transfer belt device 20 includes a driving roller 2
An endless intermediate transfer belt 20d is wrapped in a triangular shape over the roller 0a, the driven roller 20b, and the backup roller 20c, and the intermediate transfer belt 20d is circulated and transported. The drive roller 20a is driven to rotate in the direction of the arrow by a drive device of a copying process system (not shown). The driven roller 20b is a driving roller 20a.
The intermediate transfer belt 20d is arranged on the lower front side and rotates according to the circulating transfer of the intermediate transfer belt 20d. And
The backup roller 20c is located below the drive roller 20a and behind the driven roller 20b.
The intermediate transfer belt 20d rotates according to the circulating transfer. The driven roller 20b and the backup roller 20c are arranged such that the surface connecting the lower ends of the respective peripheral surfaces is substantially horizontal.

A grounded back electrode roller 28 is provided slightly forward of the backup roller 20c in the intermediate transfer belt device 20. The rear electrode roller 28 is configured to form a closed circuit of the charged charges in the intermediate transfer belt device 20 by abutting on the inner surface of the intermediate transfer belt 20d.

The photoreceptor belt 15c described with reference to FIG.
The toner image formed on the intermediate transfer belt device 2
0, the image is transferred onto the intermediate transfer belt 20d between the driving roller 20a and the driven roller 20b. This toner image is circulated and transported along the intermediate transfer belt 20d in the order of the winding portions of the driven roller 20b, the backup roller 20c, and the drive roller 20a. When the first color toner image is transferred from the photoreceptor belt 15c,
After one rotation of the intermediate transfer belt 20d, the toner image of the next color is transferred, and after one rotation, the toner image of the last color is superimposed and transferred, whereby a full-color toner image of three primary colors of yellow, magenta, and cyan is obtained. Are formed on the intermediate transfer belt 20d.

The portion where the intermediate transfer belt 20d is wound around the backup roller 20c in the intermediate transfer belt device 20 forms a second transfer portion 20e. This second
The transfer section 20e is a position for transferring the full-color toner image formed on the intermediate transfer belt 20d to the sheet 23.

Below the second transfer section 20e, a second transfer roller 22 is disposed. Second transfer roller 22
Is formed of a conductive metal such as stainless steel, and is provided with a charge of a predetermined polarity by a power supply 29. The backup roller 20c has a roller portion made of insulating rubber such as silicon rubber. The second transfer roller 22 is driven by a driving device of a sheet transport system (not shown) to drive the backup roller 20.
It rotates in the direction opposite to c.

The second transfer roller 22 is installed so as to be able to move up and down, and moves up and down based on an instruction from a control device (not shown). That is, when the second transfer roller 22 is lowered, a gap is formed between the second transfer roller 22 and the intermediate transfer belt 20d. When the second transfer roller 22 is raised, the gap between the intermediate transfer belt 20d and the second transfer unit 20e is reduced. The outer surface is pressed.

Below the intermediate transfer belt device 20 and in front of the second transfer portion 20e, a sheet transport roller 30 is provided.
And a paper guide 31 are provided. The paper 23 from the paper supply unit 25 described in FIG. 3 is transferred to the second transfer unit 20e by the paper transport roller 30 and the paper guide 312.
Will be supplied.

Below the intermediate transfer belt device 20 and behind the second transfer portion 20c, a peeling plate 32 constituting the paper peeling device of the present invention is disposed. The peeling plate 32 is a plate-like member that stands upright along the axial direction of the second transfer roller 22. Since the upper end portion of the peeling plate 32 is inclined so as to be bent toward the front side, that is, toward the paper discharge side of the second transfer roller 22, the peeling plate 32 is provided upright behind the second transfer roller 22. The second transfer unit 20
e.

The structure of the peeling plate 32 will be described in more detail with reference to FIG.

The peeling plate 32 is made of a grounded conductive member, and is composed of a SUS plate 32a and an Al plate 32b as plate members, and a PET plate (shielding plate) 32c made of an insulator. The SUS plate 32a is made of a stainless steel plate having the same width as the second transfer roller 22,
The second transfer roller 22 is supported by the apparatus frame 11 described with reference to FIG. Also, the SUS plate 32a has an upper end portion on the front side, that is, about 40 ° to 60 ° on the second transfer portion 20e side.
It is bent so as to incline at an angle. Further, the SUS plate 32a is grounded on the base side as shown.

The Al plate 32b is in the form of a plate having the same width as the SUS plate 32a, and is formed by bonding a plate of polyethylene terephthalate as an insulator to one surface of an aluminum plate as a conductor. And this Al plate 32b
, The other surface of the aluminum plate is fixed to and electrically connected to the front surface of the bent portion of the inclined front end portion of the SUS plate 32a. Therefore, the Al plate 32b is grounded via the SUS plate 32a. Therefore, the Al plate 32b and the SUS 32a constitute a grounded conductive member. Also, this Al plate 32
The leading end of b protrudes obliquely upward from the leading end of the SUS plate 32a. However, the tip of the Al plate is located slightly below the transport path of the sheet 23 discharged from the second transfer unit 20e.

The PET plate 32c is made of a polyethylene terephthalate plate having the same width as the Al plate 32b, and is fixed to a polyethylene terephthalate plate which is a front surface of the Al plate 32b. This PET plate 32c
The tip is provided to incline toward the second transfer unit 20e so that the tip slightly projects obliquely upward from the tip of the Al plate 32b. The lower end of the PET plate 32c is bent vertically and protrudes downward in parallel with the lower portion of the SUS plate 32a.

Thus, when the sheet 23 discharged from the second transfer unit 20e is sucked by the Al plate 32b and bends downward, the leading end of the PET plate 32c precedes the back of the sheet 23 with respect to the Al plate 32b. And the contact between the sheet 23 and the Al plate 32b is prevented. As a result, the contact between the conductive member portion of the peeling plate 32 and the second transfer roller 22 by the paper 23 is prevented.

The transfer operation of the second transfer unit 20e provided with the sheet peeling device by the peeling plate 32 will be described.

The second transfer roller 22 is located at a lower position except when the sheet 23 passes through the second transfer unit 20e.
When the sheet 23 is conveyed to the vicinity of the second transfer section 20e by the sheet conveyance roller 30 and the sheet guide 31, the second transfer roller 22 is raised, and its peripheral surface is outside the intermediate transfer belt 20d in the second transfer section 20e. Contact the surface. Then, the leading end 23a of the sheet 23 that has immediately reached the second transfer unit 20e is separated from the second transfer roller 22 and the intermediate transfer belt 2 by
0d. At this time, the sheet 23 is transported in synchronization with the movement of the full-color toner image formed on the intermediate transfer belt 20d.

The sheet 23 that has reached the second transfer section 20e in this manner is pressed against the intermediate transfer belt 20d by the second transfer roller 22 while the intermediate transfer belt 20d
It is transported at the same moving speed as. Here, assuming that the full-color toner image on the intermediate transfer belt 20d is positively charged, the second transfer roller 22 is negatively charged by the power supply 29 as shown in FIG. Then, the toner image on the intermediate transfer belt 20d is transferred to the second transfer roller 2
The negative charges of the second transfer member 20 are attracted and sequentially transferred onto the sheet 23 passing through the second transfer portion 20e.

The leading end 23a of the sheet 23 discharged from the second transfer unit 20e after receiving the transfer of the toner image comes close to the leading end of the peeling plate 32 provided at an inclination in the second transfer unit 20e. Become. At this time, the paper 23 is negatively charged by the pressing of the second transfer roller 22 to which the negative charge is applied. The intermediate transfer belt 20d transferred from the second transfer unit 20e to the drive roller 20a has a positive charging tendency. For this reason, conventionally, the paper 23
Is attracted to the positive charge of the intermediate transfer belt 20d, and is transferred to the drive roller 20a side together with the intermediate transfer belt 20d, so that there is a possibility that peeling is unnecessary.

However, according to the embodiment of the present invention, the sheet 23 that has passed through the second transfer section 20e is
, The Al plate 3 of the peeling plate 32
2b generates a positive charge. That is, a positive charge is induced through the grounded portion.

Here, the potential of the back surface of the paper 23 is 1000
In the case of a relatively low potential of about 4000 V, the sheet 23 is attracted by the positive charges induced on the Al plate 32b. However, the back potential of the paper 23 is 4000 to 6000.
In the case of a high potential of V, the Al plate 32 is discharged to exceed the discharge starting voltage. However, thereafter, the positive charges induced on the Al plate 32b by the negative charges remaining on the sheet are attracted as in the above.

Therefore, the paper 23 is transferred to the intermediate transfer belt 20.
It is transported straight as it is without moving upward with d. As a result, the leading end of the sheet 23 discharged from the second transfer unit 20 e is
d and is conveyed on a normal conveyance path without fail.

Further, even if the sheet 23 discharged from the second transfer unit 20e is sucked by the peeling plate 32, the sheet 23 does not come into contact with the conductive member of the peeling plate 32 by the PET plate 32c. Paper 2 due to the positive charges induced on the Al plate 32b of the peeling plate 32
3 can prevent the unfixed toner image from being disturbed.

Further, since the PET plate 32c is provided between the peeling plate 32 and the second transfer roller 22, the portion of the conductive member in the peeling plate 32 and the second
It plays a role of shielding the transfer roller 22. That is, it is possible to avoid transfer failure due to discharge of the charge applied to the second transfer roller 22 by the power supply 29 to the peeling plate 32, and to stabilize the transfer operation. Moreover, in order to efficiently perform the peeling action of the leading end 23a of the sheet 23 after the transfer, the leading end of the peeling plate 32 is moved toward the second transfer unit 20e so as to approach the second transfer unit 20e.
It is inclined to the e side. In this case, the PET plate 32c is also inclined in accordance with the inclination of the peeling plate 32, so that the discharge action between the peeling plate 32 and the second transfer roller 22 can be shielded, so that a good transfer state can be maintained. The peeling action of the sheet 23 after the transfer can be reliably performed.

Therefore, in order to efficiently perform the peeling operation, the peeling plate 32 is so inclined that the leading end of the peeling plate 32 is close to the second transfer portion 20e and the leading end of the peeling plate 32 is inclined toward the second transfer portion 20e. Is provided. In addition, a PET plate 32c is interposed between the peeling plate 32 and the second transfer roller 22 in order to block the discharge action from the second transfer roller 22 to the peeling plate 32 by approaching. As a result, since the leading end 23a of the sheet 23 is peeled off after the transfer, the leading end of the peeling plate 32 generates a charge having a polarity opposite to that of the charged charge of the sheet 23, and the peeling effect is enhanced by the electrostatic suction action. Also.

[0055]

As is apparent from the above description, according to the peeling apparatus of the present invention, in a system in which a sheet is pressed against a toner image forming medium to transfer a toner image, the leading end of a conductive member is transferred to a transfer portion after transfer. , The leading edge of the sheet can be reliably separated by the suction effect of the charge of the opposite polarity to the sheet generated on the conductive member.

At this time, since the leading end of the conductive member is inclined toward the transfer portion after the transfer, the leading end can be easily brought close to the transfer portion. It can be done effectively.

In addition, when the tip of the conductive member is brought close to the transfer portion, in order to avoid discharge of the conductive member by the transfer member, the conductive member is similarly inclined between the transfer member and the conductive member so as to follow the conductive member. By interposing the shielding member, the discharge to the conductive member during transfer is prevented, the transfer operation is stabilized,
The subsequent peeling action can be effectively performed without causing transfer failure.

[Brief description of the drawings]

FIG. 1 illustrates one embodiment of the present invention, and is an enlarged front view of a transfer unit including a sheet peeling device.

FIG. 2 is a front view showing an example of an intermediate transfer device constituting the toner image forming medium according to the present invention.

FIG. 3 is a schematic configuration diagram illustrating an overall structure of a full-color copying machine showing an example of an image forming apparatus.

FIG. 4 is a partially enlarged view showing a conventional transfer unit.

[Explanation of symbols]

 Reference Signs List 15 photoconductor belt device 15c photoconductor belt (toner image forming medium) 20 intermediate transfer device 20d intermediate transfer belt (toner image forming medium) 20e second transfer section (transfer section) 21 first transfer roller (transfer member) 22 second Transfer roller (transfer member) 23 Paper 32 Peeling plate (conductive member) 32a SUS plate (conductive member) 32d Al plate (conductive member) 32c PET plate (shielding member)

Claims (4)

[Claims] 1. An image forming apparatus comprising: a transfer member configured to transfer a toner image formed on a toner image forming medium to a sheet by pressing the sheet against the toner image forming medium; A conductive member having a leading end portion inclined toward the transfer member is provided on the paper discharge side of the transfer member at the position, and the leading end of the conductive member is made to approach the paper discharge side of the transfer member. A sheet peeling device in an image forming apparatus. 2. The sheet peeling device according to claim 1, wherein the conductive member is grounded. 3. The image forming apparatus according to claim 2, wherein the conductive member includes a shield member made of an insulating member interposed between the conductive member and the transfer member, and the shield member is inclined toward the sheet discharge side of the transfer member. 2. The method according to claim 1, wherein
A sheet peeling device in the image forming apparatus described in the above. 4. An image forming apparatus comprising: a transfer member for transferring a toner image formed on a toner image forming medium onto a sheet by pressing the sheet against the toner image forming medium; A power supply for transferring a toner image to a sheet is connected to the transfer roller, and a leading end portion is transferred to a sheet discharge side of the transfer roller at a position facing the toner image forming medium. A conductive member inclined to the member side and grounded is provided, and the conductive member is interposed between the conductive member and the transfer member in order to bring the tip of the conductive member close to the paper discharge side of the transfer roller. A sheet peeling device in an image forming apparatus, wherein a shielding member made of an insulating member is provided.