JPH1010875A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably carry a recording medium after a toner image is transferred by providing a destaticization member for attaining destaticization and simultaneously, guiding the recording medium, so that it approaches a spatial region on an image carrier side and projectingly curving the recording medium to the side of the image carrier. SOLUTION: A transfer paper 5 has destaticization work, while being in contact with the conductive brush 11 of the destaticization member 10, after the top end of the transfer paper 5 in its carrying direction is separated from a photoreceptor 1. Simultaneously, the transfer paper 5 is lifted up with respect to a transfer paper carrying path 13 in a linear direction, by the conductive brush 11. By such a change in the position of the carrying path, even if the small-diameter photoreceptor 1 is used and further, as a transfer means, a transfer charger 2 is used, the transfer paper 5 comes into contact with the photoreceptor 1 with a large area, in the peripheral direction of the small- diameter photoreceptor 1, in a transferring part 7. In other words, the contact angle θ of the transfer paper 5 with the photoreceptor 1, in the peripheral direction is made larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transferring a toner image formed on a surface of an image bearing member to a surface of the image bearing member opposed to the transfer charger by using a transfer charger spaced from the image bearing member. The present invention relates to an image forming apparatus which transfers a recording medium separated from an image carrier after the transfer to a recording medium which moves while contacting along a circumferential direction of a carrier, and conveys the recording medium from a transfer section toward a fixing unit.

[0002]

2. Description of the Related Art In an image forming apparatus of the above-mentioned type configured as a copying machine, a printer, a facsimile, or a composite machine thereof, a recording medium is transferred when a toner image is transferred.
It is necessary to contact the image carrier with a sufficient contact area along the circumferential direction of the image carrier. If the recording medium is not brought into contact with the image carrier with a sufficient contact area along the circumferential surface direction, the conveyance direction of the recording medium after transfer becomes unstable or a transfer failure of the toner image occurs. Because.

[0003] Therefore, if the image carrier is, for example, a drum-shaped one having a large diameter, the recording medium can be brought into contact with the image carrier with a sufficient contact area. However, when such a large image carrier is used and the recording medium is brought into contact with the image carrier with a sufficient contact area, the recording medium is separated from the image carrier after the transfer of the toner image. In this case, the separability deteriorates. Therefore, in the conventional image forming apparatus, a predetermined recording medium separating unit such as a separation claw or a separation charger is used in order to ensure separation of the recording medium. The structure becomes complicated and the cost increases.

On the other hand, if an image carrier having a small diameter is used, the curvature of the peripheral surface becomes large.
The recording medium is easily separated from the peripheral surface of the image carrier. A method of separating a recording medium using an image carrier having a large peripheral surface curvature is sometimes referred to as a curvature separation method.However, when such a separation method is adopted, a recording medium separation unit may be unnecessary. And simplify the configuration of the image forming apparatus.
The cost can be reduced.

However, if an image carrier having such a small diameter is used, the area of the recording medium in contact with the peripheral surface of the image carrier is insufficient, and the movement of the recording medium after the transfer of the toner image is reduced. Unstable or poor transfer occurs.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to utilize a charge removing member for removing charge from a recording medium after transferring a toner image.
An object of the present invention is to provide an image forming apparatus capable of stably transporting a recording medium after transferring a toner image by bringing the recording medium into contact with the image carrier with a sufficient contact area with the charge removing member.

[0007]

According to the present invention, in order to achieve the above object, a toner image formed on a surface of an image carrier is transferred by a transfer charger arranged at a distance from the image carrier.
The image is transferred to a recording medium that moves while being in contact with the surface of the image carrier facing the transfer charger along the circumferential direction of the image carrier, and the recording medium separated from the image carrier after the transfer is fixed from the transfer unit. In the image forming apparatus conveyed toward the means, in contact with the recording medium separated from the image carrier, the recording medium is neutralized, and the recording medium that advances toward the fixing unit is moved to a space area on the image carrier side. An image forming apparatus is provided, wherein the image forming apparatus is provided with a static elimination member that guides the recording medium such that the recording medium is moved toward the image carrier, and guides the recording medium toward the image carrier.

At this time, the discharging member is supported so as to be displaceable between a protruding position for curving the recording medium in a convex shape and a retracted position retracted from the protruding position. Immediately before reaching the transfer section where the
It is advantageous to provide a static elimination member driving means for displacing the projecting position to the retracted position (claim 2).

Further, in the image forming apparatus according to the first or second aspect, it is advantageous to provide an insulating member at a portion of the charge removing member facing the transfer charger (claim 3).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings, and the above-mentioned conventional disadvantages will be more specifically clarified with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a main part of an image forming apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a drum-shaped photoconductor which is an example of a configuration of an image carrier,
The photoconductor 1 is driven to rotate in a clockwise direction indicated by an arrow in the figure by a driving device (not shown). During this rotation,
A predetermined toner image is formed on the surface of the photoconductor 1 by performing charging, exposure, development, and the like.

The photoreceptor 1 has a transfer charger 2 opposed to the photoreceptor 1 disposed opposite to the photoreceptor 1. The transfer charger 2 mainly includes a charge wire 3 and a casing 4, and is arranged in parallel with the photoreceptor 1 in the axial direction. Reference numeral 5 denotes an example of a recording medium, which is a transfer sheet made of plain paper. The transfer sheet 5 is a photosensitive member facing the transfer charger 2 from a sheet feeding unit not shown in FIG. 1 towards the surface portion.
Then, the transfer paper 5 moves while being in contact with the surface portion along the circumferential direction of the photoconductor.

When a voltage is applied to the charge wire 3 of the transfer charger 2, the charge wire 3 and the photosensitive member 1
The corona discharge is performed between the transfer roller 2 and the toner image on the photoconductor 1 is transferred to the transfer paper 5 that moves while contacting the surface of the photoconductor facing the transfer charger 2. Hereinafter, a portion where the transfer is performed is referred to as a “transfer portion”, and is denoted by reference numeral 7. Reference numeral 6 denotes a sheet feeding unit to a transfer unit 7.
Before the transfer, the transfer paper 5 sent to the
Is a transfer entrance guide member that leads to

Reference numeral 9 denotes a fixing device as an example of a fixing unit. The fixing device 9 includes a heating roller 9A and a pressure roller 9B which is pressed against the roller. After the transfer, the transfer paper 5 separated from the surface of the photoreceptor 1 is conveyed toward the fixing device 9, and when passing between the rollers 9A and 9B, the toner image transferred onto the transfer paper is heated by the two rollers. And is fixed by the action of pressure. Reference numeral 8 denotes a transfer conveyance guide plate that guides the transfer paper 5 when the transfer paper 5 is conveyed toward the fixing device 9 after the transfer of the toner image, and is a transfer charger in the conveyance direction of the transfer paper 5. This guide plate 8 located downstream of 2 is made of a conductor,
Grounded as shown.

As described above, the image forming apparatus of this embodiment converts the toner image formed on the surface of the image bearing member
Transfer to a recording medium made of transfer paper that moves while contacting the surface portion of the image carrier facing the transfer charger 2 along the circumferential direction of the image carrier by the transfer charger 2 arranged apart from the image carrier. In addition, the recording medium separated from the image carrier after the transfer is conveyed from the transfer unit to the fixing unit.

Here, in this type of image forming apparatus, the transfer paper 5 is applied to the photosensitive member 1 when the toner image is transferred.
It is necessary to make contact with a sufficient contact area along the circumferential direction and with a sufficient close contact force. Otherwise, a sufficient conveying force cannot be applied to the transfer sheet after the transfer, and the movement of the transfer sheet becomes unstable or transfer failure occurs. When the photoreceptor 1 having a small diameter is used, the contact area of the transfer paper 5 with the photoreceptor 1 is reduced, and the adhesiveness is reduced.

In the case where a small-diameter photosensitive member is used, if a transfer roller rotating by pressing against the photosensitive member 1 is used instead of the transfer charger as shown in FIG. The photosensitive member 1 can be brought into contact with a sufficient contact area with a sufficient close contact force. However, if such a transfer roller is used, it is relatively expensive, so that the cost of the image forming apparatus increases.

Therefore, if a relatively inexpensive transfer charger is used as the transfer means and a photosensitive member having a relatively large diameter is used, the cost of the transfer means can be kept low, and the transfer paper 5 can be used sufficiently. The photoconductor 1 can be brought into contact with the contact area. However, when using such a large photoreceptor and trying to bring the transfer paper into contact with the photoreceptor with a sufficient contact area, when the transfer paper is separated from the photoreceptor after transfer, the separation property is poor. Deteriorate. Therefore, in a conventional image forming apparatus using a large-diameter photoreceptor, a predetermined transfer paper separating means such as a separation claw or a separation charger is used in order to ensure transfer paper separation. The use of the separating means complicates the configuration of the image forming apparatus and increases its cost.

On the other hand, if the photosensitive member 1 having a small diameter is used, the curvature of the peripheral surface becomes large.
Transfer paper is easily separated from the photoconductor. A curvature separation system can be adopted, and this type of image forming apparatus can be an image forming apparatus that does not require a transfer paper separating unit. However, if a photoconductor with such a small diameter is used,
As described above, the contact time between the transfer sheet and the photoconductor is shortened, the contact area of the transfer sheet along the circumferential direction of the photoconductor is insufficient, and the transfer direction of the transfer sheet after transfer becomes unstable. Or transfer failure may occur.

Therefore, in the image forming apparatus of this embodiment,
The recording medium was brought into contact with the image bearing member with a sufficient contact area by using a charge removing member for removing charge from the recording medium after the transfer. Thereby, the small-diameter photoconductor 1
And a low-cost transfer charger 2 can be used as the transfer means, and the transfer paper separating means becomes unnecessary.

FIG. 1 is a schematic view showing a main part of an image forming apparatus employing a curvature separation system. The transfer paper 5 shown in FIG. 1 is corona-discharged by a charge wire 3 during transfer of a toner image. , Of a predetermined polarity. The neutralization member 10 provided at a position downstream of the transfer unit 7 with respect to the traveling direction of the transfer paper 5 is for neutralizing the charged transfer paper 5. As a technique for performing such static elimination, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 7-36287 has already been proposed.

The static elimination member 10 includes a conductive brush 11 and a brush mounting member 1 having a base end fixed to a wrist and made of a conductor.
The conductive brush 11 is grounded by fixing the member 12 in contact with the transfer paper transport guide plate 8. When the conductive brush 11 of the thus configured static elimination member 10 comes into contact with the transfer paper 5 separated by a curvature separation method from the photoconductor 1 after the transfer, the transfer paper is neutralized.

Heretofore, conventionally, as shown in FIG. 8, the transfer paper 5 which has been transferred in the transfer section 7 is moved from the transfer section 7 along the portion of the transfer paper transport guide plate 8 which is grounded. The fixing device 9 (FIG. 1) passes through the transfer paper transport path 13.
Was sent in a straight line towards. The transfer paper 5 was sent to the fixing device 9 while passing through the transfer paper transport path 13 in the linear direction from the transfer unit 7 while being in contact with the transfer paper transport guide plate 8 and being neutralized. As shown in FIG. 1, conventionally, the transfer paper 5 is fed in the direction of the dashed arrow after the transfer, and passes through the transfer paper transport path 13 in the linear direction.
It was sent to.

On the other hand, in the image forming apparatus according to the present embodiment, the transfer sheet 5 that advances toward the fixing device 9 is moved by the transfer sheet 5 that moves toward the fixing device 9.
After the transfer of the toner image to the transfer paper transport path 13 in the linear direction, it is arranged so as to be moved toward the space area A on the photoconductor 1 side and to be curved in a convex shape. When the charge removing member 10 is the photosensitive member 1
The recording medium is separated from the image carrier, and contacts the recording medium made of the transfer paper 5 so that the recording medium is neutralized and the recording medium that advances toward the fixing unit is moved to the space area on the image carrier side. The recording medium is guided, and the recording medium is curved in a convex shape toward the image carrier.

In the embodiment shown in FIG. 1, after the transfer paper 5 is separated from the photoreceptor 1 at the leading end in the conveyance direction, the transfer paper 5 is discharged.
Of the transfer paper transport path 1 in a linear direction by the
3 lifted upwards. With such a change in the position of the transport path, even when the photoconductor 1 having a small diameter is used and the transfer charger 2 is used as the transfer unit, the transfer paper 5 can be used.
In the transfer section 7, the photoconductor 1 contacts the photoconductor 1 with a large area along the circumferential direction of the photoconductor 1 having a small diameter. That is, the contact angle θ of the transfer paper with respect to the photoconductor in the circumferential direction increases.

On the other hand, in the conventional example shown in FIG. 8, the transfer paper 5 is conveyed in a straight line direction to the fixing device through the transfer paper conveyance path 13 without being lifted after the transfer. , The contact angle θ ′ (<θ) decreases, and the contact area of the transfer paper, that is, the contact area along the circumferential surface direction of the photoconductor 1 decreases. In this case, the separation position of the transfer paper by the curvature separation method is set to the transfer entrance guide member 6.
In the case of the embodiment of FIG. 1, the separation position is closer to the static elimination member 10.

In the case of the embodiment shown in FIG. 1, the contact area of the transfer paper along the circumferential direction of the photoreceptor increases, so that the transfer paper portion in contact with the photoreceptor passes through the transfer section 7 for a long time.
It comes into close contact with the photoreceptor, thereby preventing poor transfer. In addition, after the leading end of the transfer paper 5 is once separated from the peripheral surface of the photoconductor 1, the transfer paper 5 is lifted by the charge removing member 10 so as to take a transport path close to the photoconductor 1, and the transfer paper 5 is moved. 5 is in contact with the peripheral surface of the photoconductor 1 with a large area, so that the separation of the transfer paper 5 from the photoconductor 1 does not deteriorate.

Since the contact area of the transfer paper 5 along the circumferential direction of the photoreceptor 1 increases, and the transfer paper is lifted, the contact force (close contact force) on the photoreceptor increases. A sufficient transfer force can be applied to the advancing transfer paper, and the transfer operation can be stabilized. Thereby, the transfer paper can be smoothly and reliably conveyed toward the fixing device 9 without causing a jam or the like in the transfer paper.

On the other hand, in the conventional example shown in FIG. 8, the contact area of the transfer paper along the circumferential direction of the photoreceptor is reduced, and the close contact time of the transfer paper is shortened. As a result, a sufficient transfer force cannot be given, and the movement of the transfer paper becomes unstable, so that it cannot be sent stably to the fixing device.

Further, since the contact area of the transfer paper 5 with the photosensitive member 1 can be increased, the diameter of the photosensitive member 1 can be reduced, whereby the size of the image forming apparatus can be reduced. Since the degree of separation from 1 is increased, a curvature separation method can be adopted, and it becomes possible to eliminate the need for a separation claw or a separation charger. Thus, the configuration of the image forming apparatus can be simplified, and the cost can be reduced.

The static elimination member 10 performs both functions of static elimination of the recording medium and change of the transport direction of the recording medium, so that these functions can be performed in comparison with those which perform these functions by separate members. In addition, the number of components can be reduced to one, the configuration of the image forming apparatus can be simplified, and the cost can be reduced.

FIGS. 2 and 3 show a second embodiment. In FIG. 2, the charge removing member 10 is located at a protruding position where the recording medium formed of the transfer paper 5 is curved in a convex shape. The static elimination member 10 is supported by a fulcrum shaft 14 with respect to the transfer paper transport guide plate 8.
Is mounted so as to be capable of rotating displacement. A solenoid 15 is connected to an end of the brush mounting member 12 of the static elimination member 10, and when the solenoid 15 is excited,
The static elimination member 10 is held at the projecting position.

On the other hand, when the excitation of the solenoid 15 is released, the static elimination member 10 is moved to the fulcrum shaft 14 by the force of the tension spring 16 applied between the brush mounting member 12 and the main body side plate (not shown). Rotate around counterclockwise,
The transfer paper is retracted from a protruding position (the position shown in FIG. 2) that curves the transfer paper in a convex shape. FIG. 3 shows a state in which the charge removing member 10 has been turned to the retracted position.

As described above, in the present embodiment, the static elimination member 1
Numeral 0 is supported so as to be displaceable between a protruding position where the recording medium formed of the transfer paper 5 is curved in a convex shape toward the image carrier formed of the photoreceptor 1 and a retracted position retracted from the protruded position. ing. In addition, immediately before the trailing end of the recording medium made of transfer paper in the traveling direction reaches the transfer section 7 where the transfer is performed, the discharge member driving means for displacing the discharge member 10 from the projecting position to the retracted position is provided. The solenoid 15, the sensor 17 or 19, which will be described later, and the control device constitute an example of the static elimination member driving unit. Other configurations are the same as those described above with reference to FIG.

In FIG. 2, the transfer paper 5 is conveyed from a paper supply unit (not shown) toward the transfer unit 7 in the direction of the solid line arrow. On the upstream side, the above-described sensor 17 that detects the transfer paper 5 is located.

Before the leading end of the transfer paper 5 from the paper feeding section in the transport direction reaches the sensor 17, the charge removing member 10
Is held at the retracted position shown in FIG. 3, and when the tip is detected by the sensor 17, the solenoid 15 is excited by this detection signal, and the charge removing member 10 rotates from the retracted position, and To the projected position shown. As described above, the static elimination member 10 is brought to the projecting position before the transfer of the toner image is started by the static elimination unit driving unit including the sensor 17 and the solenoid 15. At this protruding position, the charge removing member 10 transfers the transfer paper 5 passing through the transfer section 7 to the photosensitive member 1.
The convex shape is curved toward the side of the space region A. The transfer path of the transfer paper moves upward in the drawing to convert.

Next, immediately before the rear end of the transfer paper 5 in the transport direction reaches the transfer section 7 where the toner image is transferred, the excitation of the solenoid 15 shown in FIG. 2 is released. The excitation of the solenoid 15 is released at time t after the time when the rear end of the transfer paper is detected by the sensor 7. The time t is a time from when the rear end is detected by the sensor 17 to when the rear end reaches the position immediately before the transfer section 7. For example, by using a control device including an electric delay unit, the excitation of the solenoid 15 can be released after the time t from the detection of the rear end of the transfer paper by the sensor 17.

When the excitation of the solenoid 15 is released, the charge removing member 10 is returned to the retracted position shown in FIG. The charge removing member 10 does not curve the transfer paper 5 in a convex shape toward the photoreceptor side, or is rotated and displaced to a retracted position where the degree of curvature is reduced. Thereby, the transfer path of the transfer paper is returned to the transfer path 13 (FIG. 1) in the linear direction. In this way, by the discharging member driving means, the discharging member 10 is displaced from the protruding position to the retracted position immediately before the rear end of the transfer sheet in the traveling direction reaches the transfer paper portion 7 where the transfer is performed.

In FIG. 2, the transfer paper 5 is in contact with the photoreceptor 1 at a portion where the transfer entrance guide member 6 is located, in the course of transportation before and after the transfer section, that is,
The transfer member 7 is forcibly lifted by the guide member 6 about the fulcrum. When the charge removing member 10 is at the protruding position, the transfer paper 5
Is forcibly lifted by the member 10 with the transfer portion 7 as a fulcrum. In such a situation, when the trailing end of the transfer paper passes through the transfer entrance guide member 6 shown in FIG. 4, if the charge removing member 10 is kept at the projecting position in FIG. Due to the strength of the stiffness of the transfer sheet itself, the transfer sheet jumps up in the direction of arrow a and separates from the photoconductor 1. Transfer paper 5
The closeness of the rear end side to the photoreceptor 1 is deteriorated, and poor transfer is likely to occur at the rear end side.

Immediately before the rear end of the transfer paper 5 shown in FIG. 2 reaches the transfer section 7, that is, immediately before the rear end exits the entrance guide member 6, the charge removing member 10 is moved to the retracted position as shown in FIG. When the transfer paper is returned, the transfer paper
, It is possible to prevent the rear end side from jumping in the direction a (FIG. 4). As shown in FIG. 4, when the transfer paper coming out of the transfer unit 7 is lifted by the charge removing member 10, the rear end side of the transfer paper is flipped up in the direction a due to the moment around the transfer unit 7. By displacing the transfer sheet to the retreat position, the transfer paper portion coming out of the transfer section 7 cannot be lifted, so that such a jump can be prevented.

When the rear end of the transfer sheet is prevented from being swollen in the transfer section 7, poor transfer to the rear end portion is less likely to occur.

In this embodiment, even if a transfer paper having a strong stiffness which is apt to occur is used, the sloshing can be prevented, so that the occurrence of transfer failure on the trailing end portion can be avoided. It is.

In this type of image forming apparatus, when a jam occurs on the transfer sheet while the transfer sheet 5 is being conveyed, the jam state is detected by a dedicated sensor. In FIG. 5, the transfer paper 5 is conveyed from the paper supply unit 18 through the transfer entrance guide member 6 to the photoreceptor 1 in the direction of the arrow. A sensor 19 for detecting a jam is provided on the downstream side.

The jam detection sensor 19 may be used instead of the solenoid on / off control sensor 17 shown in FIG. Excitation of the solenoid 15 shown in FIG. 4 is released after T time from the time when the rear end of the transfer paper 5 is detected by the sensor 19. The T time is a time from when the rear end is detected by the sensor 19 to when the rear end reaches a position immediately before the transfer section 7. As described above, for example, by using the control device including the electric delay means, the excitation of the solenoid 15 can be released after the time T.

Here, as shown in FIG.
The insulating member 20 is provided at a portion facing the transfer charger 2.
Is provided. In this example, the insulating member 20 is attached to the brush attachment member 12 made of a conductor.
The brush mounting member 12 has one surface fixed to the transfer paper transport guide plate 8 and electrically connected thereto, and the insulating member 20 fixedly attached to the other surface facing the transfer charger 2. It is.

As described above, when a voltage is applied to the charge wire 3 during transfer, the charge wire 3
Corona discharge occurs between the photoconductor 1 and
At this time, the corona discharge flows in the direction of the arrow in FIG. When the charge removing member 10 is provided in the immediate vicinity of the transfer charger 2, a part of the discharge may flow from the charge wire 3 toward the charge removing member 10 during corona discharge. 7, the brush mounting member 12 of the static elimination member 10 is shown.
The arrow heading toward indicates the leakage discharge at that time. When such discharge leakage occurs, transfer failure may occur.

As shown in FIG. 6, the brush mounting member 12
The insulating member 20 is provided on the surface facing the transfer charger 10.
For example, by pasting and fixing, it is possible to prevent the leakage of the discharge and to make it difficult for transfer failure to occur.

The other structure of the embodiment shown in FIG. 6 is the same as that of the previous embodiment shown in FIGS. 1 to 5, and the embodiment shown in FIG. Also in the embodiment of the configuration in which the rotating member is displaced, a similar insulating member can be provided on the charge removing member 10, and leakage of corona discharge can be prevented.

The present invention relates to an image forming apparatus of the type in which an endless photosensitive belt wound around a plurality of pulleys is used as an image carrier, and transfer is performed at a belt portion wound around one of the pulleys. Is also applicable.

[0050]

According to the image forming apparatus of the first aspect, it is possible to make it difficult for transfer failure to occur and to stably convey the recording medium after transfer.
Further, since the charge elimination member can simultaneously perform the charge elimination function of the recording medium and the stable conveyance function of the recording medium after transfer, the configuration of the image forming apparatus can be further simplified,
The cost can be reduced. Further, such a series of functions and effects can be obtained in an image forming apparatus using a small image carrier that can adopt a curvature separation method or reduce the size of the image forming apparatus.

According to the image forming apparatus of the second aspect,
At the time of transfer, it is possible to prevent the rear end of the recording medium from jumping up, so that it is possible to reduce the occurrence of transfer failure at the rear end.

According to the image forming apparatus of the third aspect,
At the time of transfer, the corona discharge can be prevented from leaking to the side of the charge removing member, so that transfer failure can be less likely to occur.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a main part of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram illustrating a main part of an image forming apparatus according to another embodiment of the present invention, in which a charge removing member is rotationally displaced;

FIG. 3 is a diagram showing a state in which the static elimination member is retracted from a position protruding from a linear transport path to the transport path in the embodiment shown in FIG. 2;

FIG. 4 is a diagram showing a problem when the static elimination member continues to advance to a position protruding from a linear transport path in the embodiment shown in FIG. 2;

FIG. 5 is a schematic diagram showing a main part of the image forming apparatus having a configuration in which the on / off control of the solenoid is performed by a jam detection sensor installed near a paper feeding unit in the embodiment shown in FIG. 2; .

FIG. 6 is a schematic view showing a main part of an image forming apparatus according to still another embodiment of the present invention, in which an insulating member is provided on a charge removing member.

FIG. 7 shows a case where the insulating member shown in FIG. 6 is not provided.
FIG. 6 is a diagram for explaining that corona discharge leaks from a transfer charger toward a charge removing member.

FIG. 8 is a schematic configuration diagram around a photosensitive member and a transfer charger of a conventional image forming apparatus.

[Explanation of symbols]

 7 transfer section 10 static elimination member 20 insulating member A space area

Claims (3)

[Claims] 1. A toner image formed on the surface of an image carrier,
By the transfer charger arranged at a distance from the image carrier, the image is transferred to a recording medium which moves while being in contact with the surface of the image carrier facing the transfer charger along the circumferential direction of the image carrier, and after the transfer, In an image forming apparatus that conveys a recording medium separated from an image carrier from a transfer unit toward a fixing unit, the recording medium comes into contact with the recording medium after being separated from the image carrier, and the recording medium is discharged. An image forming apparatus, comprising: a static elimination member that guides a recording medium that advances toward the image carrier toward a space area on the image carrier side and curves the recording medium in a convex shape toward the image carrier side. apparatus. 2. The recording medium as claimed in claim 1, wherein the discharging member is displaceably supported between a projecting position at which the recording medium is curved in a convex shape and a retracted position retracted from the projecting position. The image forming apparatus according to claim 1, further comprising a static elimination member driving unit that displaces the static elimination member from the protruding position to the retracted position immediately before reaching the transfer portion where the transfer is performed. 3. The image forming apparatus according to claim 1, wherein an insulating member is provided at a portion of the charge removing member facing the transfer charger.