JPH08169586A - Transfer paper carrying device - Google Patents

Abstract

PURPOSE: To provide a transfer paper carrying device by which a transfer paper sheet remaining on a carrier belt can be easily taken out. CONSTITUTION: A transfer paper carrying device is provided with a contacting- separating means 24 which supports a transfer-carrier belt 6 so as to be capable of contacting with and separating from an image carrier 1 and sets a transmitting passage of driving force of a driving source to the transfer-carrier belt 6 and a driving part 5B of the transfer-carrier belt 6 in a cutoff condition when the transfer-carrier belt 6 is separated from the image carrier 1. Therefore, even if the driving source of the transfer-carrier belt 6 is stopped, the transfer- carrier belt 6 can be moved by external operation, and a transfer material remaining on the transfer carrier belt 6 can be easily taken out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer paper conveying device.

[0002]

2. Description of the Related Art Generally, an image forming apparatus includes an electrophotographic copying machine, a printer or a facsimile machine,
Some of these devices adopt a configuration using an electrophotographic system. In image formation by electrophotography,
When an electrostatic latent image is formed on a uniformly charged image carrier by exposure, optical writing, or the like, and the electrostatic latent image is formed by using, for example, a two-component developer in which a magnetic carrier and a toner are mixed. A toner image, which has been subjected to a visible image process with toner, is transferred onto a transfer paper or the like to obtain a copy. The transfer paper on which the toner image on the image carrier is transferred is peeled from the surface of the image carrier and conveyed toward the fixing device. There is a structure using a conveyor belt as the conveying structure.

In the structure using the conveyor belt, there is a structure having a stretched portion in the range from the position facing the image carrier to the front of the fixing device. In this structure,
The transfer unit is configured at a position facing the photoconductor. Therefore, the transport belt enables electrostatic attraction of the transfer paper transported from the paper feed unit and electrostatic attraction of toner from the photoconductor by injecting charges into the transfer paper. A material whose electric resistance is set has been used.

The transfer belt is wound around a pair of rollers, and is driven by a drive roller located on one side in the extending direction to electrostatically adsorb the transfer paper onto which the toner is transferred from the transfer portion toward the fixing device. There is.

[0005]

By the way, in a transfer sheet conveying device using a conveying belt, an image forming operation may be interrupted for some reason, and the driving of the conveying belt may be stopped accordingly. In this case, the transfer paper being conveyed by the conveyor belt remains electrostatically adsorbed on the conveyor belt, so the transfer paper is taken out and removed.
It may take measures to initialize the device.

Conventionally, as a method of taking out the transfer sheet remaining on the conveyor belt, the conveyor belt is separated from the image carrier,
A method has been adopted in which a transfer paper electrostatically adsorbed on the conveyor belt is taken out by inserting a hand into a gap generated by the separation.

However, when the conveyor belt stops,
Since the drive system is maintained in a stopped state, the conveyor belt cannot be moved, and especially when the leading edge of the transfer paper on the conveyor belt is held by a roller pair included in the fixing device, the leading edge of the transfer belt cannot be moved. A great deal of force is required to pull it out of the roller pair. Moreover, the pulling force may cause excessive tension on the transfer sheet, resulting in damage to the transfer sheet. Also, if the leading edge of the transfer paper on the conveyor belt is in the position of the gap formed between the photoconductor and the conveyor belt, it is easy to peel off the transfer paper to take out the entire transfer paper, but the leading edge is located in the above-mentioned gap. If not, it was troublesome to pull it out, as when the tip was located on the fixing device side.

An object of the present invention is to provide a transfer sheet conveying device which can easily take out the transfer sheet remaining on the conveying belt in view of the problems in the above-mentioned conventional transfer sheet conveying device.

[0009]

In order to achieve this object, the invention according to claim 1 transfers an image carrier and a toner image visualized on the image carrier to a transfer material and transfers the image. In a transfer paper conveying device equipped with a transfer / conveying belt for conveying the subsequent transfer material to the fixing device, the driving force is transmitted from a driving source to connect the driven part to the movement of the transfer / conveying belt. A transfer / transport belt driving unit, a cleaning unit disposed at a position after passing the drive unit side in the moving direction of the transfer / transport belt, for cleaning the surface of the transfer / transport belt, and the transfer / transport belt. A belt for supporting the belt so that it can be brought into contact with and separated from the image carrier, and a transmission path of a driving force between the drive source and the drive unit of the transfer / transport belt when separating the transfer / transport belt from the image carrier. To It is characterized by comprising a moving means for setting the state, the.

According to a second aspect of the present invention, in the transfer sheet conveying device according to the first aspect, an externally operable belt operating member is connected to the drive unit of the transfer / conveying belt. .

According to a third aspect of the present invention, in the transfer sheet conveying device according to the first aspect, the driving unit of the transfer / conveying belt is configured to fix the fixing / fixing device when the transfer / conveying belt is separated from the image carrier. It is characterized in that it is provided so as to be interlockable with the drive unit.

According to a fourth aspect of the present invention, in the transfer sheet conveying device according to the third aspect, the driving portion of the fixing device is connected to a belt operating member that can be operated externally.

According to a fifth aspect of the present invention, in the transfer sheet conveying device according to the first aspect, the cleaning means can separate from the surface of the transfer / conveying belt when the transfer / conveying belt separates from the image carrier. It is characterized by having a simple cleaning blade.

[0014]

According to the present invention, when the transfer / conveyance belt is separated from the image carrier, the driving unit of the transfer / conveyance belt is disconnected from the driving source, and the transfer / conveyance belt is driven. Department can operate by itself.

In the inventions according to claims 3 and 4, the transfer / transfer
When the conveyor belt is separated from the image carrier, the drive unit of the transfer / conveyor belt can be interlocked with the drive unit of the fixing device, and the transfer unit is interlocked with the drive unit of the fixing device being operated by an external operation. The conveyor belt moves.

According to the fifth aspect of the invention, when the transfer / conveyance belt is separated from the image carrier, the cleaning blade provided in the cleaning means is separated from the transfer / conveyor belt, so that the cleaning blade is moved when the transfer / conveyor belt is moved. The sliding resistance generated between and is reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in the drawings.

FIGS. 1 to 6 are schematic views for explaining the essential structure of a transfer sheet conveying device showing an embodiment of the invention described in claims 1 and 2. In FIG. 1, the photoconductor that constitutes the image carrier is composed of a drum, and the photoconductor drum 1 can be rotated in the direction of the arrow shown by a drive source such as a stepping motor (not shown). The toner image visualized by being developed on the photoconductor drum 1 is transferred to the transfer sheet S which is a transfer material when the photoconductor drum 1 moves to the transfer portion.

The transfer section is provided with a transfer sheet transfer device 2 having a transfer / transfer belt. Transfer paper transport device 2
As shown in FIG. 3, the belt unit 3 is detachably supported by the main body 2A of the apparatus 2.
In FIG. 1, the belt unit 3 includes an endless transfer / conveyance belt 6 wound around a pair of rollers 4 and 5 for transferring the toner image carried on the photosensitive drum 1 to a transfer material. , A DC solenoid 7 serving as a drive source for bringing the transfer / conveyance belt 6 into and out of contact with the photosensitive drum 1.
Also provided are a contact / separation lever 8 that can be swung by the DC solenoid 7, a bias roller 9 that applies a transfer bias to the transfer / conveyance belt 6, and a contact plate 10 that removes electric charges from the transfer / conveyance belt 6. . A pair of rollers 4, 5
Is a support 11 of the belt unit 3 as shown in FIG.
1 is rotatably supported by the photosensitive drum 1 which forms the transfer paper mounting surface of the transfer / conveying belt 6 in FIG.
The surface opposed to and rotates in a direction in which it can move in the direction indicated by arrow A. Of the pair of rollers 4, 5,
The roller 5 located on the downstream side of the transfer / transport belt 6 in the moving direction is the driving side, and the roller 4 located on the upstream side of the transfer direction is driven to rotate via the transfer / transport belt 6. There is. Therefore, the rotary shaft 5A of the roller 5
Is rotatably supported by an immovable portion that houses the main body 1A of the transfer paper transporting device 1, and has one axial end thereof linked to a main motor (not shown) serving as a drive source, as shown in FIG. Since the driven gear 5B is provided, the drive unit of the transfer / conveyance belt 6 is configured. FIG.
At the other axial end of the rotating shaft 5A, a belt operating member 5C capable of rotating the rotating shaft 5A from the outside.
Is attached. The belt operation member 5C can move the transfer / conveyance belt 6 by being rotated when the transmission of the driving force from the main motor to the driven gear 5B is cut off.

The support 11 can be swung about the rotation shaft 5A of the roller 5 as a fulcrum, and the transfer paper mounting surface on the upstream side in the moving direction of the transfer / transport belt 6 is a photosensitive drum. It can be brought into contact with or separated from 1. The contact / separation operation of the transfer / conveyance belt 6 with respect to the photosensitive drum 1 is
This is performed by a contact / separation lever 8 that can be swung by the DC solenoid 7, and the transfer sheet S has been fed to the photosensitive drum 1 from the registration roller 12 with the feeding timing set. At this time, as shown in FIG. 2, the upstream side of the transfer paper carrying surface of the transfer / conveying belt 6 in the moving direction is brought into contact with the photosensitive drum 1.

The DC solenoid 7 for swinging the support 11 is driven and controlled by the control plate 13. The control plate 13 operates a DC solenoid so as to swing the support plate 11 toward the photosensitive drum 1 at the timing when the transfer sheet S fed by the registration roller 12 approaches the photosensitive drum 1. . As a result, the transfer sheet S fed from the registration roller 12
Is sandwiched in the nip portion B formed by the transfer paper placing surface of the transfer / conveying belt 6 contacting the photosensitive drum 1, and an electric field formed by the transfer bias applied from the bias roller 9 at this time. The toner image carried on the photosensitive drum 1 is transferred due to the influence of. The bias roller 9 is connected to a high-voltage power supply 14, and the high-voltage power supply 14 is connected to a transfer control plate 15 connected to the contact plate 10.

The contact plate 10 and the transfer control plate 15 constitute a current feedback circuit which detects the current flowing through the transfer / conveyance belt 6 and controls the current supplied to the bias roller 9.

A position corresponding to the downstream side of the transfer paper carrying surface of the transfer / transport belt 6 in the moving direction, in a position bypassing the roller 5 which is a drive unit of the transfer / transport belt 6 in front of the fixing device 20,
A cleaning device 16 is arranged. As shown in FIG. 1, the cleaning device 16 includes a cleaning blade 16A that contacts the transfer / conveyance belt 6 and a recovery roller 16
B, and toner or transfer paper S when toner remaining on the transfer / conveyor belt 6 from the photosensitive drum 1 remains or toner scattered around the transfer / conveyor belt 6 is attached. Scrape off paper dust from the collection roller 16
By B, the waste toner is collected in a waste toner collecting container (not shown).

Support plate 1 constituting the belt unit 3
Among the members constituting the belt unit 3, FIG.
As shown in FIG.
Members other than 6 are housed and arranged, and the high-voltage power supply 14 and the cleaning device 16 are provided in the main body 2A of the transfer paper transporting device 2 which detachably supports the belt unit 3. In FIG. 1, reference numeral 17 denotes a pre-transfer charge eliminating lamp. The pre-transfer charge eliminating lamp 17 is used to lower the surface potential on the photosensitive drum 1 and to efficiently perform the action of the transfer bias. It is what is done.

The fixing device 20 is composed of a pair of rollers that face each other with the transport path of the transfer sheet S interposed therebetween.
The heating roller 20A on the side facing the toner image bearing surface of
Then, the pressure roller 2 is provided on the back side of the toner image bearing surface of the transfer sheet S.
0B is located respectively.

The driven gear 5B provided on the drive side of the transfer / conveyance belt 6 is, as shown in FIG. 4, the first idle gear 2 supported by the main body 2A of the transfer sheet conveying device 2.
1 is engaged with the first idle gear 21.
Engages with the second idle gear 23, which is rotatably supported by an immovable portion (not shown). The second idle gear 23 is attached to an output shaft of a main motor (not shown) serving as a drive source, and the driving force from the drive gear 22 rotatably supported by an immovable portion (not shown) is transmitted to the second idle gear 23. It is supported coaxially with the driven gear 22A.

In FIG. 1, the main body 2 of the transfer paper conveying device 2 is shown.
On the bottom plate 2A1 of A, the contacting / separating means 2 is provided in the vicinity of the support position of the driven gear 5B corresponding to the driving side of the transfer / conveyance belt 6.
4 are provided. The contacting / separating means 24 is composed of a lever swingable by a fulcrum shaft supported by an immovable portion accommodating the main body 2A of the transfer paper transport device 2.
As shown in FIG. 5, an operation lever 24A, which is a belt operation member that can be operated externally, is attached to the fulcrum shaft.

In the contacting / separating means 24, the operating lever 24A is placed in an upright position (position shown by a solid line in FIG. 1) and a horizontal position (FIG. 1).
The position of the bottom plate 2A1 of the main body 2A is pushed up when the operation lever 24A is displaced to the upright position. As a result, the main body 2A is set in a state in which the transfer / conveyance belt 6 approaches the photosensitive drum 1. When the operating lever 24A of the contacting / separating means 24 is displaced to the horizontal position, the main body 2A is rotated about the rotary shaft 5A of the roller 5 supported by the immovable portion that houses the main body 2A.
However, the oscillating end corresponding to the upstream side in the moving direction of the transfer / conveyance belt 6 is set to be separated from the photosensitive drum 1 by its own weight.

When the operating lever 24A of the contacting / separating means 24 is displaced to the horizontal position, the first idle gear 2 supported by the main body 2A of the transfer sheet conveying device 2 shown in FIG.
When 1 disengages from the second idle gear 23, the meshing between both idle gears is released, so that the transmission of the driving force to the driven gear 5B via the second idle gear 23 on the main motor side which is the drive source is transmitted. You will be refused.
As a result, the rotating shaft 5A of the transfer / conveying belt 6 is brought into a free state. Therefore, by rotating the belt operating member 5C attached to the rotating shaft 5A, the transferring / conveying belt 6 is independent of the drive source. Can be moved.

Since this embodiment has the above-mentioned configuration,
At the time of image formation, the operation lever 24A of the contacting / separating means 24 is set to the upright state, so that the main body 2 of the transfer sheet conveying device 2 is
A is set in a state of approaching the photosensitive drum 1.

FIG. 6 is a schematic diagram in which this state is replaced with a meshing state of the second idle gear 23 and the first idle gear 21 located on the main motor side. In the same figure (A), the first idle gear 21 meshes with the second idle gear 23, so that the driven gear 5B, which is meshed with the first idle gear 21, is mounted coaxially with the driven gear 5B. The roller 5 can be rotated by the transmission of the driving force from the main motor. At the time of image formation, as described with reference to FIGS. 1 and 2, when the toner image carried on the photosensitive drum 1 is transferred onto the transfer sheet S, it is related to the feeding state of the transfer sheet S. By the control plate 13, the swinging operation of the contact / separation lever 8 in the pushing-up direction via the drive control of the solenoid 7 and the application control of the transfer bias via the bias roller 9 are executed. As a result, the transfer sheet S is sandwiched by the nip portion B formed when the transfer / conveyance belt 6 is brought into contact with the photosensitive drum 1, so that the toner image is transferred to the transfer sheet S. It

FIG. 6B shows the case where the operating lever 24A of the contacting / separating means 24 is displaced to the horizontal position. In FIG. 6B, when the operating lever 24A is displaced to the horizontal position,
Since the main body 1A of the transfer sheet conveying device 1 makes the swinging end of the main body 1A from the photosensitive drum 1, the first idle gear 21 is separated from the second idle gear 23, and the meshing of both idle gears is released. As a result, the transmission of the driving force from the main motor side, which is the driving source, to the driven gear 5B is cut off, so that the rotation shaft 5A of the transfer / conveyance belt 6 becomes free and is attached to the rotation shaft 5A. When the belt operating member 5C is rotated, the transfer / transfer is performed regardless of the drive source.
The conveyor belt 6 becomes movable.

The operating lever 24 of the contacting / separating means 24
The displacement operation of A is an operation performed to take out the transfer sheet S when the transfer sheet S remains on the transfer / transport belt 6, and the drive source of the transfer / transport belt 6 is temporarily stopped. Even in such a case, it becomes possible to move the leading edge of the transfer sheet S to a position where it can be easily taken out.

Next, an embodiment of the invention described in claims 3 and 4 will be described with reference to FIGS. 7 and 8
In FIG. 6, the same components as those shown in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, the fixing device 20 can move the transfer / transport belt 6 when the transmission of the driving force from the main motor to the driven gear 5B forming the drive portion of the transfer / transport belt 6 is interrupted. It is characterized by having done. The rotary shaft 20B1 of the pressure roller 20B of the pair of rollers equipped in the fixing device 20 is rotatably supported by the immovable portion that houses the main body 2A of the transfer paper transport device 2, and its shaft is rotatably supported. As shown in FIG. 7, a belt operation member 20C that can be operated externally is attached to one end of the direction. A driven gear 20B2 capable of meshing with the first idle gear 21 shown in FIG. 4 is attached to the other axial end of the rotary shaft 21B to transmit the driving force from the drive source side. .

FIG. 8 is a schematic diagram corresponding to FIG. 6 showing the structure of the driving force transmission system from the main motor side to the driven gear 5B attached to the rotating shaft 5A of the driving side roller 5 of the transfer / conveying belt 6. Yes, FIG.
When the operation lever 24A of is displaced to the upright position,
Further, FIG. 3B shows a state in which the operation lever 24A of the contacting / separating means 24 is displaced to the horizontal position. In FIG. 8, the pressure roller 20B of the fixing device 20 has a gear 20B3 attached to its rotation shaft meshing with the gear 20A1 of the heating roller 20A so as to maintain the interlocking relationship.

The first idle gear 21 supported by the main body 2A is applied in the state shown in FIG. 8B, that is, when the swing end of the main body 2A swings in the direction away from the photosensitive drum 1. The driven gear 20B2 of the pressure roller 20B meshes with the driven gear 20B2.

Since this embodiment has the above-mentioned configuration,
In the state shown in FIG. 8A, the same operation as that shown in FIG. 7A can be obtained. In the state shown in FIG. 8 (B),
The first idle gear 21 supported by the main body 2A meshes with the driven gear 20B2 of the pressure roller 20B. As a result, the rotation of the driven gear 20B2 is transmitted to the first idle gear 21 by rotating the belt operating member 20C (see FIG. 7) attached to the rotating shaft 20B1 of the pressure roller 20B. The driven gear 5B supported coaxially with the rotation shaft 5A of the roller 5 on the drive side of the transfer / transport belt 6 meshing with the first idle gear 21 can rotate. Therefore, the transfer / transport belt 6
Can be moved by rotating the pressure roller 20B of the fixing device 20. For this reason,
Even if the drive source of the transfer / conveyance belt 6 is stopped, the leading end of the transfer sheet S can be moved to a position where it can be easily taken out.

Next, referring to FIG. 9 and FIG.
An embodiment of the described invention will be described. 9 and 10, the same components as those shown in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted. In the embodiment shown in FIGS. 9 and 10, the cleaning blade 16A provided in the cleaning device 16 shown in FIG.
Is provided so as to be able to come into contact with and separate from the transfer / conveyance belt 6. In FIG. 9, the cleaning blade 16A is arranged at a position where the front end can contact the transfer / conveyance belt 6, and the base end is attached to the support blade 16A1. The supporting blade 16A1 is a swinging piece in which a supporting portion corresponding to the length of the cleaning blade 16A in the longitudinal direction is configured as a swinging end, and the base end corresponding to the swinging fulcrum side is the lengthwise direction of the cleaning blade 16A. A support shaft portion 16A2 is formed to extend further than both ends in the direction. One end of the support shaft portion 16A2 in the axial direction is rotatably supported by an immovable portion that serves as a storage portion of the transfer sheet conveying device 2. As shown in FIG. 9, a swing lever 16A3 having a support shaft portion 16A2 supported by the main body 2A1 as a fulcrum is fixed to the other end of the support shaft portion 16A2 in the axial direction. When the main body 2A moves in the direction in which the main body 2A moves away from the photoconductor drum 1 with the rotary shaft 5A on the drive side of the transfer / conveyance belt 6 as a fulcrum, the swing lever 16A3 moves.
6A2 can swing with the distance from the center of the rotating shaft 5A as the swing radius. Swing lever 16
One end of a spiral spring 31 hung between the swing end and the main body 2A is hooked on the swing end of A3. String spring 31
Has a habit of bringing the cleaning blade 16A into contact with the surface of the transfer / transport belt 6. The swinging end has a locking projection 16A4 which can be fitted into the concave upper locking portion 30A formed in the same portion 30 when the main body 2A swings.
Are formed.

Since this embodiment has the configuration as described above,
When the operating lever 24A of the contacting / separating means 24 shown in FIG. 1 is displaced to the upright position, the cleaning blade 16A
Can come into contact with the surface of the transfer / conveyance belt 6 due to the habit of the coil spring 31 and scrape off the adhered toner and paper dust. When the operation lever 24A of the contacting / separating means 24 shown in FIG. 1 is displaced to the horizontal position, the main body 2A of the transfer sheet conveying device 2 is
The swinging end swings in the direction away from the photosensitive drum 1 (the direction indicated by the symbol F in FIG. 9). With the swing of the main body 2A,
The swing lever 16A3 supported by the main body also swings about the drive-side rotation shaft 5A of the transfer / conveyance belt 5, but during the swing, the locking projection 16A4 of the swing lever 16A3 moves the immovable portion 30. It fits into the concave engagement part of. For this reason, in FIG. 10 showing the operation lever 24A of the contacting / separating means 24 in the upright position, as shown by the chain double-dashed line, the swing lever 1 is moved by the end of the swing of the main body 2A.
6A3 stops swinging and can be separated from the transfer / conveyance belt 6.

As the cleaning blade 16A moves away from the surface of the transfer / conveyance belt 6 in this manner, the sliding resistance generated between the cleaning blade 16A and the transfer / conveyor belt 6 is reduced, so that the transfer / conveyor belt 6 is prevented. It can be moved easily. The present inventor measured the driving torque of the driving-side roller 5 required to move the transfer / conveyance belt 6 by reducing the sliding resistance by an experiment and found that it was about 5 N · cm.
The result that can be reduced was obtained.

[0042]

As described above, according to the first and second aspects of the present invention, when the transfer / conveyance belt is separated from the image carrier, the drive unit of the transfer / conveyance belt is interlocked with the drive source. Since the relationship is broken and the drive unit of the transfer / transport belt can be independently operated by an external operation, the transfer material remaining on the transfer / transport belt can be easily taken out.

According to the third and fourth aspects of the present invention, when the transfer / conveyance belt is separated from the image carrier, the drive unit of the transfer / conveyance belt can be interlocked with the drive unit of the fixing device. The transfer / transport belt moves in conjunction with the external drive of the drive unit,
Even if the drive source of the conveyor belt is stopped, the transfer material remaining on the transfer / conveyance belt can be reliably taken out.

According to the fifth aspect of the invention, when the transfer / conveyance belt is separated from the photoconductor, the cleaning blade provided in the cleaning means is separated from the transfer / conveyor belt, so that the cleaning is performed when the transfer / conveyor belt is moved. Since the sliding resistance generated between the blade and the blade is reduced, the transfer / transport belt can be easily moved, and the transfer material remaining on the transfer / transport belt can be easily taken out.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a configuration of a main part of a transfer sheet conveying device showing an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining one aspect of the transfer paper transport device shown in FIG.

FIG. 3 is a perspective view showing a main part of a transfer sheet conveying device showing an embodiment of the present invention.

FIG. 4 is a perspective view showing a configuration of a driving force transmission system of the transfer sheet conveying device shown in FIG.

5 is a perspective view for explaining a configuration of an operation unit of the transfer sheet conveying device shown in FIG.

6A and 6B are schematic diagrams for explaining the operation of the driving force transmission system shown in FIG. 4, in which FIG. 6A shows image formation and FIG. 6B shows non-image formation.

FIG. 7 is a perspective view showing a configuration of a driving force transmission system of a transfer sheet conveying device according to another embodiment of the present invention.

8A and 8B are schematic diagrams for explaining the operation of the driving force transmission system shown in FIG. 7, in which FIG. 8A shows image formation and FIG. 8B shows non-image formation.

FIG. 9 is a perspective view showing a main configuration of a transfer sheet transporting device according to another embodiment of the present invention.

FIG. 10 is a schematic diagram showing the operation of the main part configuration shown in FIG.

[Explanation of symbols]

1 photoconductor drum corresponding to an image carrier 2 transfer sheet conveying device 2A main body 4 driven roller of transfer / conveying belt 5 driving roller of transfer / conveying belt 5A rotating shaft of driving roller 5B driving part of driving roller Eggplant driven gear 5C Externally operable belt operating member 6 Transfer / conveying belt 16 Cleaning device 16A Cleaning blade 16A1 Support blade 20 Fixing device 20B Pressing roller 20B2 Externally operable belt operating member 21 Part of driving force transmission part 1st idle gear 23 2nd idle gear 24 which forms a part of driving force transmission part 24 Contact / separation means 24A Operation lever

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Hisashi Ito 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. No./Ricoh Company (72) Inventor Yuko Harasawa 1-3-6 Nakamagome, Ota-ku, Tokyo-Ricoh Company (72) Koichi Ishii 1-3-6 Nakamagome, Ota-ku, Tokyo- Stock company Ricoh

Claims (5)

[Claims] 1. A transfer comprising an image carrier and a transfer / conveying belt for transferring the toner image visualized on the image carrier to a transfer material and for carrying the transferred transfer material toward a fixing device. In the paper transporting device, the drive force of the drive source is transmitted to the transfer / transport belt driving unit that controls the movement of the transfer / transport belt, and the drive unit side in the moving direction of the transfer / transport belt. A cleaning unit disposed at a rear position for cleaning the surface of the transfer / conveyance belt, and the transfer / conveyance belt are supported so as to be able to come into contact with and separate from the image carrier, and the transfer / conveyance is performed from the image carrier. A transfer paper conveying device, comprising: a contacting / separating unit that sets a transmission path of a driving force between the driving source and a driving unit of the transfer / conveying belt to a disconnected state when separating the belt. 2. The transfer sheet transporting device according to claim 1, wherein a belt operating member that can be operated externally is connected to the drive unit of the transfer / transporting belt. 3. The transfer sheet conveying device according to claim 1, wherein the driving unit of the transfer / conveying belt can interlock with the driving unit of the fixing device when the transfer / conveying belt is separated from the image carrier. A transfer sheet conveying device, which is provided. 4. The transfer paper transporting device according to claim 3, wherein a belt operating member that can be operated externally is connected to the drive unit of the fixing device. 5. The transfer sheet conveying device according to claim 1, wherein the cleaning means includes a cleaning blade which can be separated from the surface of the transfer / conveying belt when the transfer / conveying belt is separated from the image carrier. A transfer paper transport device characterized in that