JPH10198192A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device capable of preventing the occurrence of the abnormal image derived from the triboectrification between a guide member and a transfer material by providing a plastic guide member for transporting the transfer material to the image transferring part on the image carrier and a sheet member being held in plane contact with the transfer material between the transfer material. SOLUTION: As for the device, on a top surface of a section near to a photoreceptor 18 on a rib 95 and the top surface of a auxiliary rib, Mylar (R) sheet 98 is stuck for covering these top surfaces. The transfer paper P held between and transported by resist rollers pair 24, is brought into plane contact with the Mylar (R) sheet provided on a top end of the lib in the vicinity of a photoreceptor, and reaches a transferring nip part of the photoreceptor. Then, in the vicinity of the photoreceptor, since the transfer paper P is held in plane contact with while guided by the Mylar (R) sheet 98, the Mylar (R) sheet 98 and the transfer paper P are uniformly electrified, the transfer paper P and the Mylar (R) sheet 98 is severally restrained from locally rising potential, and thus the electric discharge to the photoreceptor 18 is prevented from the occurrence.

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 facsimile, and a printer.
The present invention relates to an image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, as this type of image forming apparatus,
2. Description of the Related Art There is known an image forming apparatus provided with a pair of registration rollers for nipping and conveying a transfer sheet as a transfer material at a nip portion between an image carrier as a transfer section of a developed image and a transfer roller. In such an image forming apparatus, the transfer paper on the downstream side in the transfer paper transport direction of the nipping and transporting unit by the registration roller pair is accurately transported to the nip portion between the photosensitive member as the image carrier and the transfer roller, and has a certain transfer performance. In order to obtain a good image, a guide member is provided in contact with the transfer paper, and the transfer paper is separated from the guide member on the upstream side in the transfer paper transport direction reaching the nip portion between the photosensitive member and the transfer roller, and is transferred to the nip portion. An arrangement configured to be transported is known.

[0003] For example, in Japanese Patent Application Laid-Open No. 64-7047, the guide member is formed integrally with a process unit housing which has a developing roller and a collecting roller and is configured to be detachably attached to an image forming apparatus main body. What has been proposed. Usually, the housing of the process unit is often made of a resin by injection molding or the like, and is generally formed to a thin thickness of about 1 to 4 mm for the purpose of preventing sink marks and the like. Therefore, when a heavy object such as a developer is held inside the process unit, it is necessary to provide a rib on the housing to compensate for the lack of rigidity. In the case where the guide member is formed integrally with the housing of the process unit, the rib may be used as a guide member for the transfer paper. When ribs are used as guide members, of the plurality of ribs, only ribs that are parallel to the transfer paper transport direction are formed higher than other ribs so that the transfer paper is guided well without being caught. In addition, it is necessary that the transfer paper be configured to contact and be guided by the top edges of the parallel ribs.

Further, in order to more accurately guide the transfer paper to the nip portion between the photosensitive member and the transfer roller by the guide member, it is necessary to provide the guide member to a position closer to the nip portion, that is, the photosensitive member.

[0005]

However, when the guide member is made of a resin material, the contact portion between the guide member and the transfer paper is liable to be frictionally charged, so that the guide member is charged near the photosensitive member. When the transfer paper is separated from the guide member, a discharge from the guide member to the photoreceptor occurs.For example, in the case of a negative-positive toner, the toner is attracted to a strong charge and a black image becomes white, and an abnormal image is formed. There was a problem that it would occur.

Conventionally, the linear speed of the registration roller is generally set to be faster than the linear speed of the photoconductor. For this reason, the transfer paper nipped and conveyed by the registration roller and having reached the end of the photoconductor is transferred to the registration roller. It is in a state of being arched between the holding portion and the photoconductor. In the case where the guide member is formed in such a shape as to come in contact with the transfer paper in the bent state and to guide the transfer paper, at the moment when the rear end of the transfer paper passes through the holding portion by the pair of registration rollers, the transfer paper is formed. The shape may change and separate from the guide member. Even at the moment when the transfer sheet comes off from the guide member due to the transfer sheet falling out of the holding portion of the pair of registration rollers, the discharge to the photosensitive member easily occurs, and the abnormal image is generated.

In addition, the above-mentioned problem due to frictional charging between the guide member and the transfer paper is likely to occur particularly in a low-humidity environment or when the transfer paper is dry, such as during double-sided copying.

The present invention has been made in view of the above problems, and has as its object to provide a resin-made guide member for transporting a transfer material to a transfer section of a developed image on an image carrier. An object of the present invention is to provide an image forming apparatus capable of preventing occurrence of an abnormal image due to frictional charging between a guide member and a transfer material.

[0009]

According to another aspect of the present invention, there is provided an image forming apparatus, comprising: an image carrier having an electrostatic latent image on a surface thereof; and an electrostatic latent image on the image carrier. A developing device that supplies a developer to the transfer material to form a developed image, a transfer unit that transfers the developed image to a transfer material, and guides a transfer path of the transfer material that locally contacts the transfer material and enters the transfer unit. A sheet member that is in surface contact with the transfer material at the local portion of the guide member in a portion of the guide member close to the image carrier. It is assumed that.

In the image forming apparatus of the first aspect, a sheet member is provided between the guide member and the transfer material in surface contact with the transfer material, and the transfer material is guided in surface contact with the sheet member near the image carrier. In this way, the local portion of the resin guide member is prevented from coming into direct contact with the transfer material near the image carrier. As a result, in the vicinity of the image carrier, the sheet member and the transfer material are frictionally charged uniformly by surface contact, and the frictional charging is so large that the local portion of the resin guide member is discharged toward the image carrier by contact with the transfer material. Don't do it.

According to a second aspect of the present invention, there is provided an image forming apparatus having an image carrier having an electrostatic latent image on a surface thereof, and a developing device for supplying a developer to the electrostatic latent image on the image carrier to form a developed image. An image forming apparatus comprising: an apparatus; a transfer unit that transfers the developed image to a transfer material; and a resin guide member that guides a transfer path of the transfer material that contacts the transfer material and enters the transfer unit. The contact position closest to the image carrier among the contact positions of the guide member where the guide member and the transfer material are in contact is changed to a position where discharge from the guide member onto the image carrier occurs. It is characterized in that it is separated from the image carrier to such an extent that it does not occur.

In the image forming apparatus according to the present invention, the contact position of the guide member closest to the image carrier among the contact positions of the resin guide member and the transfer material is shifted from the guide member to the image carrier. Even if the guide member is excessively charged by the friction with the transfer paper at the contact position at the contact position, the developed image on the image bearing Avoid it.

According to a third aspect of the present invention, there is provided an image forming apparatus having an image carrier having an electrostatic latent image on a surface thereof, and a developing device for supplying a developer to the electrostatic latent image on the image carrier to form a developed image. An apparatus, a transfer unit for transferring the developed image to a transfer material, and a resin-made resin that guides a transfer path of the transfer material by contacting the transfer material so that the transfer material can be positioned and enter the transfer unit. An image forming apparatus having a guide member, wherein the transfer material is guided by a spur in contact with the transfer material in the vicinity of the image carrier.

In the spur described above, the contact portion with the transfer material rotates with the movement of the transfer material, and no triboelectric charging occurs at this contact portion.

In the image forming apparatus of the third aspect, the transfer material is guided by a spur that does not frictionally charge due to contact with the transfer material in the vicinity of the image carrier, and a resin guide member and the transfer material are provided in the vicinity of the image carrier. Is prevented from being triboelectrically charged by contact, so that the charged charge is not discharged to the image carrier.

According to a fourth aspect of the present invention, there is provided the image forming apparatus according to the first, second or third aspect, wherein the guide member carries a developer for supplying a developer to the electrostatic latent image. It is characterized in that the charging member is formed integrally with a housing of a process cartridge accommodating at least one of a charging member for supplying a charge to the image carrier or a cleaning member for cleaning the image carrier.

In the image forming apparatus of the present invention, the charge of the guide member made of resin is prevented from being discharged to the image carrier near the image carrier, and the guide member is formed integrally with the housing of the image forming apparatus. I do.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment 1] Hereinafter, a first embodiment in which the present invention is applied to an image forming apparatus will be described. FIG. 1 is a cross-sectional view illustrating an arrangement of an image forming unit 10, a transfer / separation device 11, and a fixing device 12 of the image forming apparatus according to the present embodiment.

First, a schematic configuration of the image forming apparatus of this embodiment and a method of forming an image on a transfer sheet as a transfer material will be described. This image forming apparatus includes an image forming unit 1
0, a transfer / separation device 11, and a fixing device 12. The image forming unit 10 is formed in a cartridge shape, and is configured to be detachable from an image forming apparatus main body (not shown). Further, the transfer / separation device 11 includes a transfer roller 13 and is attached to the image forming apparatus so as to be rotatable up and down in the figure by a rotation fulcrum 14. The fixing device 12 includes a pressure roller 15 and a heating roller 16.

The image forming unit 10 includes a photoconductor 18 as an image carrier, a charging device having a charging roller 19 in a resin photoconductor surrounding case (hereinafter referred to as a case) 17, a developer stirring member 43, The image forming apparatus includes a developing device 20 having a developing roller 23, a cleaning device 21, a toner recycling belt 22 for feeding toner collected by the cleaning device to the developing device 20, a toner conveying screw 42, and the like.

FIG. 2 is a perspective view showing the appearance of the image forming unit 10. As shown in FIG. As shown in this figure, an upper cover 37 that covers the case is provided on the upper part of the case in order to prevent the photoreceptor 18 and the charging roller 19 from contacting a person.

On the other hand, the transfer paper P fed from a paper feed unit (not shown) has its leading end and the leading end of the toner image on the photosensitive member 18 in a nip (hereinafter referred to as a nip) between the photosensitive member 18 and the transfer roller 13. ,
The timing is adjusted by the registration roller pair 24 so as to coincide with each other at the transfer nip portion, and the toner image on the photoconductor 18 is transferred onto the transfer paper P by the transfer roller 13. The transfer paper P on which the toner image has been transferred is applied to the pressing roller 1 of the fixing device 12.
The toner image transferred to the nip portion between the transfer roller 5 and the heating roller 16 is fused by heat and pressure to the transfer paper P and discharged to a discharge tray (not shown) outside the apparatus.

FIG. 3 is a perspective view of the bottom structure of the photoreceptor surrounding case 17 of the image forming unit 10 showing a characteristic portion of the present invention. As shown in FIG. 3, when the image forming unit 10 is mounted on the image forming apparatus main body, the image forming unit 10 is located on the upstream side in the transfer paper transport direction from the position where the transfer paper P enters the transfer nip portion on the photoreceptor 18. The case 17 is located between a portion where the developer stirring member 43 to be located immediately above the registration roller pair 24 is stored and a portion where the photoconductor 18 is exposed to the outside.
A plurality of ribs 95 and auxiliary ribs 96 and 97 are provided on the bottom surface of the. Usually, the case of the above-described image forming unit 10 or at least the developing device 20 for developing the latent image on the photoreceptor 18 is one to one for convenience of injection molding of resin or the like.
A thin wall thickness of about 4 mm (2.2 in this embodiment)
mm thickness). Therefore, the ribs 95 and the auxiliary ribs 96 and 97 have low rigidity and are easily deformed.
Are provided to reinforce the housing case.

Next, the features of this embodiment will be described. FIG. 4 is a plan view showing a bottom structure of the case 17 shown in FIG. In the present embodiment, of the ribs 95 and the auxiliary ribs 96 and 97, the ribs 95 parallel to the transfer paper transport direction,
The auxiliary ribs 96 are formed so as to protrude as compared with the auxiliary ribs 97 that are not parallel to the transfer paper transport direction. When the image forming unit 10 is mounted on the mounting portion of the main body of the image forming apparatus, the auxiliary rib 96 is provided only at a portion near the photosensitive member 18, and the rib 95 and the auxiliary rib 96 have the other auxiliary rib 97. (See FIG. 1). The rib 95 and the auxiliary ribs 96 and 97 are formed integrally with the case 17.

When the image forming unit 10 is mounted on the mounting portion of the image forming apparatus main body, the rib 95
The top edge is formed so as to extend the lowest on the upstream side in the transfer paper transport direction and draw a smooth curve as the highest on the downstream side. Specifically, as shown in FIG. 1, the top edge of the rib 95 is relatively upwardly raised so as to draw a large arc immediately after passing the lowest extending portion 95 a near the registration roller pair 24. In the vicinity of the photoreceptor 18, the degree of upward movement becomes smaller. The auxiliary rib 96
The height of the rib 95 in the vicinity of the photosensitive member 18 rising upward is set to be equal to or slightly higher than the height of the raised top edge. A plurality is formed between them.

In this embodiment, the top edges of the ribs 95 and the auxiliary ribs 96 have a role as a guide member for transporting and guiding the transfer paper P nipped and transported by the registration roller pair 24 to the transfer nip portion. However, when the transfer paper P comes into contact with the top edge of the rib 95 as a guide member in the vicinity of the photoreceptor 18, only the top edge portion of the rib 95 is contact-charged and the potential becomes higher than other portions, and Since the potential at the sharp edge, which is the top edge, is higher than that at other portions, it is easy to discharge, so the photosensitive member 18
To generate an abnormal image.

In order to prevent the occurrence of an abnormal image as described above, in the present embodiment, the surface forming the top edge of the rib 95 (hereinafter referred to as the top surface) is made flat, and the photosensitive member 18 of the rib 95 is formed. On the top surface of the close part and the top surface of the auxiliary rib 96,
A band-shaped mylar sheet 98 as a sheet member covering the top surfaces of the ribs 95 and 96 is bonded (see FIG. 4). Even if there is a gap between the ribs 95, the mylar sheet 98 is
Does not bend. It is preferable that the mylar sheet 98 be slightly wider than the maximum sheet passing width of the transfer sheet P. Further, the linear velocity of the registration roller pair 24 is set faster than the linear velocity of the photoconductor 18. For this reason, the transfer paper P pinched and conveyed by the registration roller pair 24 is pushed out by the registration roller pair when the leading end enters the transfer nip portion, and is arched upward with the transfer nip portion. Therefore, the mylar sheet 98 may be provided over a range in the paper passing direction where the ribs 95 and 96 may come into contact with the transfer sheet P due to the deflection of the transfer sheet P. In the present embodiment, the Mylar sheet 98 is used as the sheet member, but the material of the sheet member is preferably a material having low contact resistance with the transfer paper P, and is not limited to Mylar.

In the above configuration, the registration roller pair 24
The transfer paper P, which has been nipped and conveyed, comes into contact with the lowest extending portion 95 a of the rib 95 near the registration roller pair 24, and is conveyed toward the transfer nip portion which is a nip portion between the photosensitive member 18 and the transfer roller 13. Is done. As the transfer of the transfer paper P proceeds, the transfer paper P comes into surface contact with the mylar sheet 98 provided on the top edge of the rib 95 near the photoconductor 18, and then reaches the transfer nip. After reaching the transfer nip, the transfer paper P is transferred to the registration roller pair 24 and the photoconductor 1 as described above.
Due to the linear speed ratio of 8, the sheet is bent upward between the registration roller pair 24 and the transfer nip portion, and the distance in the paper passing direction in contact with the mylar sheet 98 in the vicinity of the photoreceptor 18 is slightly lengthened and guided.

According to the above configuration, in the vicinity of the photoreceptor 18, the transfer paper P is guided in surface contact with the mylar sheet 98, so that the mylar sheet 98 and the transfer paper P are uniformly charged, and the transfer paper P The potential of the Mylar sheet 98 does not partially increase. In addition, even if the potential is partially increased, the Mylar sheet 98 does not have a sharp-shaped portion that is easily discharged, so that it is difficult to discharge. From this, the photosensitive member 1
8 can be prevented from being discharged, and no abnormality occurs in the developed image on the photoreceptor 18 due to frictional charging between the transfer sheet and the guide member. Further, even in a low-humidity environment in which discharge is liable to occur, the present invention can prevent discharge, so that occurrence of an abnormal image can be prevented.

[Second Embodiment] Next, a second embodiment will be described. FIG. 5 is an enlarged view of a main part showing a characteristic part according to the second embodiment. FIG. 5 is an enlarged view of a portion C in the image forming apparatus of FIG. 1. The difference from the first embodiment is the shape of the guide member. Therefore, the description of the parts common to the first embodiment is omitted.

The guide member includes a part of the housing indicated by hatching in the vicinity of the photosensitive member 18, a rib 95 and an auxiliary rib 9.
6 is comprised. In the present embodiment, the surface of the guide member near the photoconductor 18 that is in contact with the transfer paper P is cut off to the extent that a step is formed with respect to the surface that is separated from the photoconductor 18. As a result, the surface of the guide member facing the transfer paper P is located lower on the upstream side 99a in the transfer paper P transport direction of the step near the photoreceptor 18 and above on the downstream side 99b. With this configuration, the transfer paper P is nipped and conveyed by the registration roller pair 24 and contacts the lowest extending portion 95a of the rib 95 near the registration roller pair 24,
The sheet is conveyed toward a nip between the photoconductor 18 and the transfer roller 13. As the transfer of the transfer paper P proceeds, the transfer paper P comes into contact with the top edge of the upstream side 99a of the step portion of the housing, and when further transferred, reaches the transfer nip without contacting the downstream side 99b. (Hereinafter, margin)

By providing a step on the surface of the guide member near the photosensitive member 18 facing the transfer sheet P as described above, the transfer sheet P does not contact the guide member near the photosensitive member 18 and Since the transfer sheet P comes into contact with the guide member at a slightly distant position, even if the guide member is frictionally charged by the contact with the transfer sheet P and is easily discharged, the distance to the photoreceptor 18 is long. Does not discharge. Therefore,
An abnormal image due to electric discharge is not generated in the image on the photoconductor 18.

In the second embodiment, the photosensitive member 1
The distance from the photoreceptor 18 to the guide member 99a closest to 8 and in contact with the transfer paper P is set to a distance so that discharge to the photoreceptor 18 does not occur. This distance is not fixed, and is, for example, the strength of an impact which strikes a guide member of the transfer paper P depending on a curve drawn by the transfer paper P between the transfer roller P and the registration roller pair 24 to the transfer nip. This depends on the easiness of electrification of the components contained in the transfer paper P, the material of the housing forming the guide member and the resin forming the ribs, and the like. For this reason,
It is necessary to set the distance according to various conditions.

In the second embodiment, only the surface of the guide member facing the transfer paper near the photosensitive member 18 is cut off, and the upper portion is left. This is photoconductor 1
When the toner is supplied to the photoreceptor 18 from the developing roller 23 side at the facing portion, the toner 8 unexpectedly drops,
This is useful for preventing generation of toner contamination on the transfer paper P thereunder, and for maintaining the rigidity of the housing of the process cartridge constituting the image forming unit 10.

Third Embodiment Next, a third embodiment will be described. FIG. 6 is an enlarged view of a main part showing a characteristic part according to the third embodiment. 6 is also an enlarged view of a portion C in the image forming apparatus of FIG. 1, and differs from the first embodiment in that the guide member is partially shown by hatching near the photoreceptor 18. And a rib 95 and an auxiliary rib 96, and a spur 100 is provided on the guide member. Hereinafter, description of portions common to the first embodiment will be omitted.

In FIG. 6, the axis of the shaft in the width direction with respect to the transfer direction of the transfer paper P is located near the photosensitive member 18 at the top edge of the rib 95 where the transfer paper P is nipped and transported by the registration roller pair 24 at the transfer nip. An extended spur 100 is provided. The spur 100 is provided so as to protrude downward from the top edge of the rib 95 near the photoreceptor 18.
After the transfer paper P contacts the guide member on the downstream side in the transport direction. This spur 1
When the transfer sheet P moves while being in contact with the transfer sheet P, the transfer sheet P rotates together with the transfer sheet P and the contact portion between the spur 100 and the transfer sheet P is not frictionally charged.

According to the configuration in which the spur 100 is provided near the photoconductor 18 as in the present embodiment, the spur 100 as a guide member is frictionally charged near the photoconductor 18 to discharge the charged charge to the photoconductor 18. Therefore, an abnormal image due to discharge is not generated in the image on the photoconductor 18.

The shapes of the ribs 95 and the auxiliary ribs 96 and 97 that can be employed in the present invention are not limited to those in the illustrated embodiment, and various shapes can be used.

In the first to third embodiments,
Case 17 of process cartridge of image forming unit 10
Although the guide member formed integrally with the process cartridge has been described, the present invention is also applicable to a guide member not formed integrally with the housing of the process cartridge. However,
In recent years, in particular, the miniaturization of machines has progressed, and a process cartridge formed compactly has often contributed to miniaturization of the entire apparatus. Further, in consideration of weight reduction of the apparatus and reuse of members, the process cartridge is often formed of a resin case. Under such circumstances, forming the guide member integrally with the resin case is more effective in reducing the number of parts and miniaturizing the apparatus.
The effect obtained by applying the present invention to the process cartridge is great.

[0040]

According to the image forming apparatus of the first aspect, the resin-made guide member and the transfer material are brought into surface contact with each other so as to be uniformly charged, and the local portion of the resin-made guide member is discharged toward the image carrier. As a result, the charge is prevented from being discharged from the local portion of the guide member to the image carrier, and a resin material for transporting the transfer material to the transfer section of the developed image on the image carrier is used. In the image forming apparatus provided with the guide member, there is an excellent effect that occurrence of an abnormal image due to frictional charging between the guide member and the transfer material can be prevented.

According to the image forming apparatus of the second aspect,
Even if the guide member is excessively charged due to friction with the transfer paper,
Since the contact position between the guide member and the transfer material is separated from the image carrier so as not to cause an abnormality in the developed image on the image carrier, the transfer material is transported to the transfer section of the developed image on the image carrier. An image forming apparatus provided with a resin-made guide member has an excellent effect of preventing occurrence of an abnormal image due to frictional charging between the guide member and the transfer material.

According to the image forming apparatus of the third aspect,
The transfer material is prevented from being triboelectrically charged by contact between the resin guide member and the transfer material in the vicinity of the image carrier, so that the charge is not discharged to the image carrier. In an image forming apparatus provided with a resin-made guide member for conveying to the transfer section, there is an excellent effect that occurrence of an abnormal image due to frictional charging between the guide member and the transfer material can be prevented.

According to the image forming apparatus of the fourth aspect,
In the vicinity of the image carrier, the charge of the guide member made of resin is prevented from being discharged to the image carrier, and since the guide member is formed integrally with the housing of the image forming apparatus, the transfer material is placed on the image carrier. In an image forming apparatus provided with a resin guide member for transporting the developed image to a transfer section, it is possible to prevent the occurrence of an abnormal image due to frictional charging between the guide member and the transfer material, and to use a part as a guide member. Eliminating the necessity of adding a new component has an excellent effect that the number of components can be reduced, the size of the device can be reduced, and the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an arrangement of an image forming unit, a transfer separation device, and a fixing device of an image forming apparatus according to a first embodiment.

FIG. 2 is a perspective view showing the appearance of the image forming unit shown in FIG.

FIG. 3 is a perspective view of a bottom structure of a photoreceptor surrounding case of the image forming unit showing a characteristic portion according to the first embodiment;

FIG. 4 is a plan view showing a bottom structure of the image forming unit case shown in FIG. 3;

FIG. 5 is an enlarged view of a main part showing a characteristic part according to the second embodiment.

FIG. 6 is an enlarged view of a main part showing a characteristic part according to a third embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 imaging unit 11 transfer / separation device 12 fixing device 13 transfer roller 15 pressure roller 16 heating roller 17 imaging unit case 18 photoconductor 19 charging roller 20 developing device 21 cleaning device 23 developing roller 43 developer stirring member 95 rib 96 , 97 Auxiliary rib 98 Mylar sheet 100 Spur P Transfer paper

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Watanabe 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company (72) Inventor Toshitaka Yamaguchi 1-3-6 Nakamagome, Ota-ku, Tokyo Share Inside Ricoh Company (72) Inventor Kenzo Tatsumi 1-3-6 Nakamagome, Ota-ku, Tokyo Stock Company Ricoh Company (72) Inventor Hiroshi Yoshinaga 1-3-6 Nakamagome, Ota-ku, Tokyo Stock Company Ricoh Company ( 72) Inventor Ken Amamiya 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company (72) Inventor Mayumi Ohori 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company

Claims (4)

[Claims] An image carrier that carries an electrostatic latent image on a surface thereof; a developing device that supplies a developer to the electrostatic latent image on the image carrier to form a developed image; A transfer unit for transferring to
An image forming apparatus comprising: a resin guide member that guides a transfer path of the transfer material, where a local portion contacts the transfer material and enters the transfer portion, wherein the guide member includes a guide member that is adjacent to the image carrier. An image forming apparatus, wherein a sheet member that comes into surface contact with the transfer material is provided at the local portion of the guide member. 2. An image carrier for carrying an electrostatic latent image on a surface thereof, a developing device for supplying a developer to the electrostatic latent image on the image carrier to form a developed image, and a transfer material for transferring the developed image to a transfer material A transfer unit for transferring to
An image forming apparatus comprising: a resin guide member that guides a transfer path of the transfer material that contacts the transfer material and enters the transfer unit, wherein the guide member is in contact with the transfer material. The contact position closest to the image carrier among the contact positions of the members is separated from the image carrier so that discharge from the guide member onto the image carrier does not occur. Image forming device. 3. An image carrier for carrying an electrostatic latent image on a surface thereof, a developing device for supplying a developer to the electrostatic latent image on the image carrier to form a developed image, and a transfer material for transferring the developed image to a transfer material A transfer unit for transferring to
An image forming apparatus comprising: a resin guide member that contacts the transfer material and guides a transfer path of the transfer material so that the transfer material can be positioned and enter the transfer portion. An image forming apparatus configured to guide the transfer material by a spur contacting the transfer material. 4. The image forming apparatus according to claim 1, wherein said guide member is provided with a developer carrier for carrying a developer to be supplied to said electrostatic latent image, and a charged charge is supplied to said image carrier. An image forming apparatus is formed integrally with a housing of a process cartridge accommodating at least one of a charging member to be cleaned and a cleaning member for cleaning the image carrier.