JPH08160787A - Image forming device - Google Patents

Abstract

PURPOSE: To prevent the occurrence of a jamming paper, to improve the removing property of the jamming paper and to further reduce the size of a device, etc., in the copying machine capable of attaching/detaching a transfer roller with respect to a photosensitive body. CONSTITUTION: The image forming device provided with the gear 12 of the resist roller 7 end part, the gear 13 of the transfer roller 9 end part, the stretch spring (not shown in figure) for imparting the pressing force in the direction apart from the photoreceptor sensitive body 1 to the transfer roller 9, the drive force converting mechanism equipped with the relaying gear 14 engaged with the gears 12 and 13, also capable of converting the rotating force of the gear 12 into the driving force for shifting the transfer roller 9 toward butting to the photosensitive body 1 and to the rotating force for rotating the transfer roller 9 so as to move the surface of the transfer roller 9 butting to the photosensitive body 1 in the same direction as the photosensitive body surface, and the transporting guide member 8 for guiding the transfer paper 5, is constituted that the transfer roller 9 and the driving force converting mechanism are attached to the transporting guide member 8, and the transporting guide member 8 is made turnable to the saving position at a distance from the photosensitive body 1 by centering around the supporting shaft 8a.

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, and more particularly to an image forming apparatus having a transfer roller for transferring a toner image from an image carrier to a transfer material. is there.

[0002]

2. Description of the Related Art Conventionally, as this type of image forming apparatus,
It is known that a transfer roller as a transfer means is brought into contact with the surface of the image bearing member. However, a transfer failure due to toner stain, a back stain of the transfer material, or an image whiteness due to stain of the transfer roller contact portion of the image bearing member. There is a problem that streaks and transfer defects due to poor surface durability of the transfer roller occur.
There is known an image forming apparatus provided with a transfer roller that can be brought into and out of contact with an image carrier in order to solve such a problem. For example, in Japanese Patent Laid-Open No. 59-68765, the first registration roller of the registration roller pair is also used as the transfer roller, and the first registration roller is used as the transfer roller.
The registration roller is configured to be able to come in contact with and separate from the image bearing member, and the rotation of the pair of registration rollers causes the first registration roller to revolve while revolving around the first registration roller about its rotation center. What is brought into contact with the body is disclosed. In addition, for example, the actual exploitation 63-4957
In Japanese Patent Laid-Open No. 2 (1994), a bracket that supports both ends of a transfer roller that can move back and forth with respect to the image carrier is driven by a solenoid to bring the transfer roller into and out of contact with the image carrier.

[0003]

However, in the structure disclosed in Japanese Patent Laid-Open No. 59-68765, the first resist which is also used as the transfer roller while sandwiching the transfer material by the registration roller pair is used. When the roller and the image carrier are brought into contact with each other, the transfer material is apt to jam. Further, since the transfer roller also serves as the registration roller, it is necessary to bring the first registration roller, which also serves as the transfer roller, into contact with the image carrier at an early timing after the rotation of the pair of registration rollers is started. The contact speed of the first registration roller is fast and becomes shocking, which causes speed fluctuations of the image bearing member, so that a so-called jitter image is likely to be generated, and further, when the transfer processing is performed on a thick paper, a fold or a rattling noise is generated. There was also a problem that such things were likely to occur.

Further, in the structure disclosed in Japanese Utility Model Laid-Open No. 63-49572, since a contacting / separating mechanism including electric control such as a solenoid is used, the structure tends to be complicated and the cost is reduced. It was difficult to improve the reliability of components and control.

The present invention has been made in view of the above problems, and it is an object of the present invention that a transfer roller can be brought into contact with and separated from the jammed paper, the occurrence of jammed paper can be prevented, and the removability of jammed paper can be improved. An object of the present invention is to provide an image forming apparatus that can further reduce the size of the apparatus.

[0006]

In order to achieve the above-mentioned object, the invention of claim 1, 2, 3 or 4 comprises a first gear fixed to the end of the shaft body of the registration roller, and a transfer. A second gear fixed to the end of the shaft of the roller, a biasing force applying means for applying a biasing force to the transfer roller in a direction of separating from the image carrier, a first gear and a second gear. A relay gear that meshes with the first gear, and a driving force of a predetermined magnitude that moves the transfer roller so that the rotational force of the first gear contacts the image carrier, and a contact force that contacts the image carrier. A driving force conversion mechanism that converts the transfer roller into a rotational force that rotates the transfer roller so that the surface of the transfer roller moves in the same direction as the surface of the image carrier, and the transfer material from the holding portion of the registration roller to the transfer roller and the image carrier. It is equipped with a transport guide member that guides it to be transported between the body and Particularly, in the invention of claim 1, the transfer roller and the driving force converting mechanism are attached to the conveying guide member, and the conveying guide member carries an image bearing centering on a support shaft. The present invention is characterized in that the transfer roller can be swung to a retracted position away from the body, and in particular, the invention of claim 2 determines the direction of contact and separation of the transfer roller with respect to the image carrier. It is characterized in that it is substantially parallel to the transfer direction of the transfer material at the position, and in particular, the invention of claim 3 is characterized in that the first gear, the second gear and the driving force converting mechanism are provided. The transfer roller is provided only on one end side of the shaft body, and the clearance between the both ends of the shaft body of the transfer roller and their bearings, or between the bearing and their supporting members is set to the transfer roller. The feature is that only one end side of the In particular, in the invention of claim 4, the image carrier, the transfer roller and the driving force converting mechanism are configured as a detachable process cartridge that moves integrally with the apparatus main body, It is characterized in that the first gear on the registration roller side and the relay gear of the driving force converting mechanism mesh with each other in a state where the process cartridge is mounted on the apparatus main body.

[0007]

According to the present invention, the rotation of the registration roller is stopped during non-image formation, and the transfer roller is separated from the image carrier by the urging force applied by the urging force applying means. To do. On the other hand, at the time of image formation, the first gear fixed to the end of the shaft of the registration roller rotates as the registration roller rotates. Then, a driving force conversion mechanism having a relay gear that meshes with the first gear causes a rotational force of the first gear to move the transfer roller in a direction in which the transfer roller is brought into contact with the image carrier. And a rotational force for rotating the transfer roller so that the surface of the transfer roller contacting the image carrier moves in the same direction as the surface of the image carrier. As a result, the transfer roller contacts the surface of the image carrier while rotating in the forward direction with respect to the image carrier. The transfer guide member guides the transfer material from the holding portion of the registration roller so as to be conveyed through the contact position between the transfer roller and the image carrier, and the visible image on the image carrier is transferred to the transfer material. Transcribed.

Particularly, in the first aspect of the invention, the transfer roller and the driving force converting mechanism are attached to the conveying guide member, and the conveying guide member swings to the retracted position away from the image carrier about the support shaft. When the jammed paper is processed and the transfer roller is maintained, the movable guide member swings around the support shaft to a retracted position away from the image carrier, so that the movable guide member can move together with the movable guide member. The transfer roller and the relay gear can also be retracted.

Further, according to the second aspect of the present invention, the transfer roller is configured such that the contact / separation direction of the transfer roller with respect to the image carrier is substantially parallel to the conveying direction of the transfer material at the contact / separation position of the transfer roller. While rotating in the forward direction with the image carrier,
It can be softly contacted along the surface of the image carrier.

Particularly, in the invention of claim 3, the first gear, the second gear and the driving force converting mechanism are provided only on one end side of the shaft body of the transfer roller, and the shaft body of the transfer roller is provided. By setting the clearance between both end portions of the transfer roller and their bearings, or between the bearings and their supporting members so that they can be separated from the image carrier only on one end side of the transfer roller, The first gear and the second gear are provided on both sides in the axial direction.
It is possible to perform the contact / separation operation of the transfer roller with a simpler configuration as compared with the case where the gear and the driving force conversion mechanism are provided.

In particular, in the invention of claim 4, the image carrier, the transfer roller and the driving force converting mechanism are constituted as a detachable process cartridge which moves integrally with the apparatus main body, and the process With the cartridge mounted on the main assembly of the apparatus, the first gear on the registration roller side and the relay gear of the driving force converting mechanism mesh with each other, so that the transfer material is held at the transfer roller while being held by the registration roller. When a jam occurs in the state where the process cartridge is conveyed to the process cartridge, if the registration roller is rotated while the process cartridge is mounted, the transfer roller is also rotated along with the rotation and the transfer material can be sent to the process cartridge side. The process cartridge can then be removed to remove the jammed paper.

[0012]

Embodiments Embodiments in which the present invention is applied to an electrophotographic copying machine (hereinafter referred to as a copying machine) which is an image forming apparatus will be described below. 1A and 1B are schematic configuration diagrams of a copying machine according to an embodiment. In FIG. 1, a photoreceptor 1 as an image carrier is uniformly charged by a charger 2 and imagewise exposed by an exposure device 3 to form an electrostatic latent image. This electrostatic latent image is developed by the developing device 4 to form a visible image such as a toner image. Then, the transfer sheet 5 as a transfer sheet fed by a sheet feeding device (not shown) comes into contact with the nip position of the pair of registration rollers 6 and 7, and the skew is corrected to stop in the correct posture. Then, the registration rollers 6,
When the rotation of 7 starts, the transfer paper 5 is fed at a timing with respect to the visible image on the photoconductor 1 and guided by the upper guide member 19 and the transport guide member 8 to the photoconductor 1 by the contact / separation mechanism described later. The image is sent to the transfer position where the transfer roller 9 abuts.
The transfer paper 5 on which the visible image on the photoconductor 1 is transferred is fixed by the fixing device 10.
After being sent to and fixed there, it is ejected out of the machine. On the other hand, the surface of the photoconductor 1 after the transfer is cleaned by the cleaning member 11 and then prepared for the next image formation.

In the copying machine having the above structure, the transfer roller 9
The contact / separation mechanism with respect to the photoconductor 1 is configured as follows. FIG. 1A is a schematic configuration diagram of a contact / separation mechanism of the transfer roller 9 when the registration rollers 6 and 7 are not rotating.
The contact / separation mechanism is provided at both ends of the shaft body 9a of the transfer roller 9, and the shaft body of the registration roller 7 of the pair of registration rollers 6 and 7 that rotates in the same rotation direction as the transfer roller 9 when the transfer paper 5 is conveyed. The first gear 12 fixed to the end of the transfer roller 9 and the second gear 1 fixed to the end of the shaft 9a of the transfer roller 9.
3, a tension spring (not shown) as an urging force applying means for applying an urging force in a direction of separating from the photoconductor 1 to the transfer roller 9, and a relay gear 14 meshing with the gear 12 and the gear 13.
And a rotational force of the gear 12 that causes the transfer roller 9 to move in a direction in which the transfer roller 9 contacts the photoconductor 1 and a surface of the transfer roller 9 that contacts the photoconductor 1 is exposed to light. It is configured by a driving force conversion mechanism that converts into a rotational force that rotates the transfer roller 9 so as to move in the same direction as the body surface. This drive force conversion mechanism includes a relay gear 14 rotatably attached to a fixed shaft 14a and a fixed shaft 14a.
And a bracket 15 as a swing support member that is swingably attached to both ends of the shaft and that swingably supports both ends of the shaft body 9a of the transfer roller 9 at its swing tip.

The contact / separation mechanism is also provided with a conveyance guide member 8 for guiding the transfer paper 5 from the holding portion of the registration rollers 6 and 7 so as to pass between the transfer roller and the image carrier. . The transfer guide member 8 is attached with a transfer roller 9 and the driving force converting mechanism, is formed so as to hold the transfer roller 9 from below at a transfer position, and further has a support shaft 8a provided on the fixing device 10 side as a center. It is possible to swing.

In FIG. 1A, the transfer roller 9 is urged by a tension spring (not shown) in a direction (counterclockwise direction in the drawing) away from the photoconductor 1 about the fixed shaft 14a of the relay gear 14. . This urging force acts from the gear 13 on the transfer roller 9 side to the relay gear 14, and the bracket 15 is rotatable around the fixed shaft 14a of the relay gear 14, so that the transfer roller 9 is separated from the photoconductor 1. .

In FIG. 1B, the registration rollers 6,
When 7 rotates in the direction of the arrow, the gear 12, the relay gear 14,
Although the rotation is transmitted to the gear 13, the relay gear 14 simultaneously rotates the bracket 15 that rotatably supports the gear 13 and the transfer roller 9 in the arrow A direction. That is, the gear 13 and the transfer roller 9 revolve around the relay gear 14 while rotating on their own axis. Due to this revolution force, the transfer roller 9 is brought into contact with the photoconductor 1. After this contact, a bias voltage for transfer is applied to the transfer roller 9 by a power source (not shown) at a predetermined timing, and the transfer process is performed. When the rotation of the registration rollers 6 and 7 is stopped, the state returns to the state of FIG. 1A and the next copy standby state is set.

When the jammed paper is processed and the transfer roller 9 is maintained, the transfer guide member 8 is rotated in the direction of arrow B around the support shaft 8a as shown in FIG. 9, relay gear 14, bracket 15
And the like can be retracted together with the transport guide member 8.

The surface portion of the transfer roller 9 is made of a foaming sponge having a specific resistance, and its material is silicone, urethane, epichlorhydrin, EP.
DM or the like can be used. By using such a transfer roller 9, it is possible to softly contact the surface of the photoconductor 1 while rotating in the forward direction with the photoconductor 1.

Further, since the transfer roller 9 itself tends to separate from the photosensitive member 1 due to its elasticity or its own weight, the elasticity or its own weight of the transfer roller 9 itself is used instead of the tension spring described in FIG. 1A. You may use it as an urging | biasing force provision means.

As described above, according to the present embodiment, since the transfer roller 9 contacts the photosensitive member 1 only when necessary and does not always contact, it is possible to prevent transfer failure due to toner stain, back stain, and image white streaks. The durability can be improved. Also,
Compared with a contact / separation mechanism including electric control such as a solenoid and an electromagnetic clutch, the configuration can be simplified, and cost reduction, reliability improvement, power saving, and device size reduction can be achieved. Further, as compared with a contact / separation mechanism in which one of the registration rollers is also used as a transfer roller, it is possible to prevent a jam of the transfer paper, a jitter image, and a fold or a rattling noise when transferring the thick paper.

Further, according to this embodiment, when the jammed paper is processed and the transfer roller 9 is maintained, the transfer guide member 8 is rotated around the support shaft 8a to transfer the transfer roller 9 and the relay gear. Since the bracket 14, the bracket 15, and the like can be retracted together with the conveyance guide member 8, the jam paper removal property and the maintenance maintenance property of the transfer roller 9 can be improved.

FIGS. 3A and 3B are schematic configuration diagrams of a copying machine according to another embodiment of the present invention. In FIG. 3, the same parts as those of the copying machine of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. In the copying machine of this embodiment, the contact / separation mechanism of the transfer roller 9 with respect to the photoconductor 1 is configured as follows. FIG. 3A is a diagram when the registration rollers 6 and 7 are not rotating. The contacting / separating mechanism of this embodiment is different from that shown in FIG. 1 in that it is swingably attached to both ends of the shaft body 7a of the registration roller 7, and both ends of the shaft body 14a of the relay gear 14 are swingably attached to both ends thereof. A bracket 15 is provided so as to rotatably support the portion. Further, elongated holes 16 are formed in the rear side plate and the front side plate that support the end portion of the shaft body 9a of the transfer roller 9, and the end portion of the shaft body 9a moves in the longitudinal direction inside the long hole 16. It is possible. Further, the longitudinal direction of the elongated hole 16 is set so as to coincide with the traveling direction of the transfer paper 5. The bracket 15, the relay gear 14, and the elongated holes 16 in the side plate constitute the driving force conversion mechanism.

Further, the conveyance guide member 8 at the transfer position
Are formed so as to hold the transfer roller 9 from below within the moving range of the transfer roller 9 along the longitudinal direction of the slot 16. (Hereinafter, margin)

In FIG. 3A, the transfer roller 9 is guided in the longitudinal direction of the slot 16 by a tension spring (not shown) and is urged in a direction away from the photoconductor 1. This urging force acts from the gear 13 on the transfer roller 9 side to the relay gear 14, and the bracket 15 swings clockwise around the shaft body 7a of the registration roller 7.

In FIG. 3B, the registration rollers 6,
When 7 rotates in the direction of the arrow, the gear 12, the relay gear 14,
Although the rotation is transmitted to the gear 13, the relay gear 12 simultaneously rotates the bracket 15 that rotatably supports the gear 14 and the fixed shaft 14a thereof in the arrow C direction. That is, gear 1
4 revolves around the relay gear 12 while rotating. This revolution force (rotational moment acting on the bracket 15 and the gear 14) acts on the gear 13 and the transfer roller 9 in the longitudinal direction of the slot 16. FIG. 4 is a perspective view of this state. When the bracket 15 rotates in the direction of arrow C, the transfer roller 9 moves in the direction of arrow D. This moving direction is the traveling direction of the transfer paper 5, and is also the direction in which the transfer roller 9 contacts the photoconductor 1. After this contact, a bias voltage for transfer is applied to the transfer roller 9 by a power source (not shown) at a predetermined timing, and the transfer process is performed. When the rotation of the registration rollers 6 and 7 is stopped, the state returns to the state shown in FIG. 3A and the next copy standby state is set.

In particular, according to this embodiment, the transfer roller 9 is moved toward and away from the photoconductor 1 by making the transfer roller 9 substantially in parallel with the conveying direction of the transfer paper 5 at the contact position. Since the soft contact can be made along the surface of the photoconductor 1 while rotating in the forward direction with respect to 1, the occurrence of the jam is more effective than the case where one of the registration rollers is used as the transfer roller. In addition to the prevention, it is possible to prevent the occurrence of a jitter image due to the impact when the transfer roller 9 comes into contact, and to prevent the folding or the rattling noise when transferring the thick paper.

In each of the above embodiments, the contact / separation mechanism for the transfer roller 9 is provided at both ends of the shaft 9a of the transfer roller 9, but it may be provided at one end as shown in FIG. Good. 5A is a top view of the contact / separation mechanism provided at one end of the shaft body 9a of the transfer roller 9, and FIG. 5B is a description of the transfer roller 9 in a state of being separated from the photoconductor 1. It is a figure.
Here, both ends of the shaft body 9a of the transfer roller 9 and the bearing 1 thereof
8, or the clearance between the bearing 18 and the housing 17, which is a supporting member thereof, in a range wider than the width of the transfer sheet 5 in the axial direction of the transfer roller 9.
Is set so that it can be separated from the photoreceptor 1 on one side. With this configuration, the shaft body 9a of the transfer roller 9 is axially supported on the end side opposite to the end where the contact / separation mechanism such as the gear train is provided, and the other end side of the contact / separation mechanism is supported. Only separated,
The surface of the transfer roller 9 is separated from the surface of the photoconductor 1. Since the transfer roller 9 is separable from the photosensitive member 1 on one side in this way, the structure is simpler than that in the case where the contacting / separating mechanism including the gear trains is provided on both sides in the axial direction of the transfer roller 9. The transfer roller 9 can be moved toward and away from the transfer roller 9, the degree of freedom in layout around the photosensitive member 1 is increased, and the size of the apparatus can be further reduced.

Further, as shown in FIG. 6, the driving force transmission mechanism including the photoconductor 1, the transfer roller 9 and the relay gear 14 is constructed as a detachable process cartridge which moves integrally with the apparatus main body. May be. In this case, with the process cartridge 20 mounted in the apparatus main body,
The gear 12 on the registration roller 6 side and the relay gear 14 are engaged with each other. In FIG. 6, when a jam occurs and the jam detection is activated while being sandwiched between the photoconductor 1 and the transfer roller 9 and between the pair of registration rollers 6 and 7, the rotation of the registration rollers 6 and 7 is stopped, The transfer roller 9 is shown in FIG.
It is separated from the photoconductor 1 as shown in FIG. If the process cartridge 20 is pulled out from the main body of the apparatus while the rollers hold the transfer paper 5, the transfer paper 5 will be torn, so normally the knobs of the registration rollers 6 and 7 are manually turned to temporarily transfer the transfer paper 5. After sending out 5, the process cartridge 20 is to be removed. In the case of the configuration of this example, the gear 13 on the transfer roller 9 side and the gear 12 on the registration roller 7 side are connected to the relay gear 1 with the process cartridge 20 mounted.
The registration rollers 6 and 7 are engaged with each other through
When you manually rotate, the transfer roller 9 will rotate with it and the transfer paper 5
Are sent in the transport direction. As described above, since the transfer roller 9 rotates in association with the registration rollers 6 and 7 during the jam processing, the jammed paper is not jammed into the bellows shape on the front side of the transfer roller 9 in the conveying direction. The removability is improved. Further, the transfer roller 9 and the photoconductor 1 are not damaged.

In the above embodiment, only one relay gear 14 is meshed between the gear 12 on the registration roller 7 side and the gear 13 on the transfer roller 9 side. A gear train including three or five or more odd number of relay gears may be meshed. Further, in the above-described embodiment, the relay gear 14 is configured to mesh with the lower registration roller 7, but the upper registration roller 6 has two gears.
A gear train made up of an even number of relay gears, which is equal to or more than one, may be meshed.

[0030]

According to the present invention, the transfer roller is separated from the image carrier by the urging force applied by the urging force applying means at the time of non-image formation, and at the time of image formation. With the rotation of the registration roller, the first gear fixed to the end portion of the shaft body of the roller rotates to rotate the first gear.
Drive force conversion mechanism having a relay gear that meshes with the gear of the first gear, the drive force of a predetermined magnitude for moving the transfer roller in the direction in which the rotational force of the first gear abuts against the image carrier, and the image carrier. By converting into a rotational force that rotates the transfer roller so that the surface of the transfer roller abutting on the image carrier moves in the same direction as the surface of the image carrier, the transfer roller is rotated in the forward direction with respect to the image carrier, Since it can be brought into contact with the surface of the image carrier, the separating / contacting mechanism of the transfer roller has a simpler structure compared to the case where a solenoid or the like is used, resulting in cost reduction, power saving, downsizing and reliability. There is an effect that it is possible to improve.

In particular, according to the first aspect of the present invention, when the jammed paper is processed or the transfer roller is maintained, the conveyance guide member is swung about the support shaft to a retracted position away from the image carrier. As a result, the drive force conversion mechanism having the transfer roller and the relay gear can be retracted together with the transport guide member, so that the jam paper can be removed more easily, and the transfer roller can be easily maintained.

Further, according to the second aspect of the invention, the transfer roller is separated from and brought into contact with the image carrier substantially parallel to the transfer material conveyance direction at the contact position of the transfer roller. Since it can be brought into soft contact with the surface of the image carrier while rotating in the forward direction with the image carrier, the occurrence of jams is more likely to occur than when one of the registration rollers is used as the transfer roller. In addition to being effectively prevented, it is possible to prevent a jitter image from being generated due to an impact when the transfer roller comes into contact with, and to prevent a fold or a rattling sound at the time of transferring thick paper.

Further, according to the third aspect of the invention, the transfer roller can be separated from the image carrier on one side, as compared with the case where the gear and the driving force converting mechanism are provided on both sides in the axial direction of the transfer roller. With the simpler structure, the transfer roller can be separated and contacted, the degree of freedom in layout around the image carrier is increased, and the size of the apparatus can be further reduced.

Further, in particular, according to the invention of claim 4, the driving force converting mechanism having the image carrier, the transfer roller and the relay gear is constructed as a process cartridge which can be integrally attached to and detached from the apparatus main body. When the cartridge is mounted on the main body of the device, the first gear on the registration roller side meshes with the relay gear, causing a jam when the transfer material is conveyed to the transfer roller while being held by the registration roller. In this case, when the process cartridge is installed, the transfer roller is rotated to send the transfer material to the process cartridge side, and then the process cartridge can be removed to remove the jammed paper. It can be improved, and the transfer roller is damaged and the image carrier is damaged when the jammed paper is removed. There is an effect that it is possible to prevent such.

[Brief description of drawings]

FIG. 1A is a front view showing a schematic configuration of a transfer roller separation state of a copying machine according to an embodiment. FIG. 2B is a front view showing a schematic configuration of the copying machine in a contact state with a transfer roller.

FIG. 2 is a front view showing a schematic configuration of a transfer roller retracted state of the copying machine.

FIG. 3A is a front view showing a schematic configuration of a copying machine according to another embodiment in a state where the transfer rollers are separated from each other. FIG. 2B is a front view showing a schematic configuration of the copying machine in a contact state with a transfer roller.

FIG. 4 is a perspective view of a main part of the copying machine.

FIG. 5A is a top view showing a schematic configuration of a copying machine according to still another embodiment. FIG. 6B is an explanatory view showing a separated state of the transfer roller in the copying machine.

FIG. 6 is a front view showing a schematic configuration of a copying machine including a process cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photoconductor 5 Transfer paper 6,7 Registration roller 7a Registration roller shaft 8 Transport guide member 8a Transport guide shaft 9 Transfer roller 9a Transfer roller shaft 12 Registration roller end gear 13 Transfer roller end Gear 14 Relay gear 14a Fixed shaft of relay gear 15 Bracket 16 Side plate elongated hole 17 Housing 18 Bearing 20 Process cartridge

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G03G 21/18

Claims (4)

[Claims] 1. A first gear fixed to the end of the shaft of the registration roller, a second gear fixed to the end of the shaft of the transfer roller, and a direction away from the image carrier. Urging force applying means for applying the urging force to the transfer roller, and a relay gear meshing with the first gear and the second gear,
In addition, the rotational force of the first gear is a driving force of a predetermined magnitude for moving the transfer roller in the direction of contacting the image carrier, and the surface of the transfer roller contacting the image carrier is the image carrier. A driving force conversion mechanism that converts the rotational force to rotate the transfer roller so that the transfer material moves in the same direction as the surface, and the transfer material is conveyed from the holding portion of the registration roller between the transfer roller and the image carrier. A transfer guide member that guides the transfer roller and the driving force conversion mechanism to the transfer guide member, and the transfer guide member is at a retracted position away from the image carrier about a support shaft. An image forming apparatus characterized in that it can swing freely. 2. A first gear fixed to the end of the registration roller shaft, a second gear fixed to the end of the transfer roller shaft, and a direction away from the image carrier. Urging force applying means for applying the urging force to the transfer roller, and a relay gear meshing with the first gear and the second gear,
In addition, the rotational force of the first gear is a driving force of a predetermined magnitude that moves the transfer roller in the direction of contact with the image carrier, and the surface of the transfer roller that contacts the image carrier is the surface of the image carrier. A driving force converting mechanism that converts the rotational force to rotate the transfer roller so as to move in the same direction, and the transfer material is conveyed from the holding portion of the registration roller between the transfer roller and the image carrier. And a conveyance guide member for guiding the transfer roller so that the contact direction of the transfer roller with respect to the image carrier is substantially parallel to the transfer material transport direction at the contact position of the transfer roller. apparatus. 3. A first gear fixed to the end of the shaft of the registration roller, a second gear fixed to the end of the shaft of the transfer roller, and a direction away from the image carrier. Urging force applying means for applying the urging force to the transfer roller, and a relay gear meshing with the first gear and the second gear,
In addition, the rotational force of the first gear is a driving force of a predetermined magnitude that moves the transfer roller in the direction of contact with the image carrier, and the surface of the transfer roller that contacts the image carrier is the surface of the image carrier. A driving force converting mechanism that converts the rotational force to rotate the transfer roller so as to move in the same direction, and the transfer material is conveyed from the holding portion of the registration roller between the transfer roller and the image carrier. And a conveyance guide member that guides the transfer roller, and the first gear, the second gear, and the driving force converting mechanism are provided only on one end side of the shaft body of the transfer roller. Between the two ends of the bearing and their bearings, or between the bearings and their support members,
An image forming apparatus characterized in that only one end side of the transfer roller is set to be separable from the image carrier. 4. A first gear fixed to the end of the shaft of the registration roller, a second gear fixed to the end of the shaft of the transfer roller, and a direction away from the image carrier. Urging force applying means for applying the urging force to the transfer roller, and a relay gear meshing with the first gear and the second gear,
In addition, the rotational force of the first gear is a driving force of a predetermined magnitude that moves the transfer roller in the direction of contact with the image carrier, and the surface of the transfer roller that contacts the image carrier is the surface of the image carrier. A driving force converting mechanism that converts the rotational force to rotate the transfer roller so as to move in the same direction, and the transfer material is conveyed from the holding portion of the registration roller between the transfer roller and the image carrier. And a transfer guide member for guiding the image carrier, the image carrier, the transfer roller, and the driving force conversion mechanism are configured as a detachable process cartridge that integrally moves with respect to the apparatus main body. With it attached to the main body,
An image forming apparatus, wherein a first gear on the registration roller side and a relay gear of the driving force converting mechanism mesh with each other.