JPH08166733A - Transfer device for image forming machine - Google Patents

Abstract

PURPOSE: To provide a transfer device for an image forming machine capable of surely discharging charge electrified on the surface of a transfer belt at a downstream end in a carrying direction. CONSTITUTION: This transfer device is provided with a belt unit having a 1st roller 43 disposed at the downstream end in the carrying direction, a 2nd roller 49 disposed at an upstream end in the carrying direction and the transfer belt 57 stretched between the 1st and the 2nd rollers 43 and 49, an electrifying means electrifying the transfer belt 57 with the charge having a specified polarity, and a cleaning means 68 provided with a cleaning blade 75 disposed on an opposite side to an image carrier 3 and cleaning the surface of the transfer belt 57 and a waste toner storing chamber 680 storing the toner scraped by the blade 75. The cleaning means 68 is provided with a sealing member 81 covering the upper part of the storing chamber 680 and constituted of a conductive material in contact with the surface of the transfer belt 57 at the 1st roller part, and the sealing member 81 is grounded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer device equipped in an image forming machine such as an electrophotographic device or an electrostatic recording device, and more specifically, it transfers a toner image formed on an image carrier onto a transfer paper. The present invention relates to a transfer device of an image forming machine that conveys a transfer sheet on which a toner image is transferred.

[0002]

2. Description of the Related Art A transfer device for an image forming machine of this type is disclosed in, for example, Japanese Patent Laid-Open No. 2-10389 and Japanese Patent Laid-Open No. 4-345183.
No. 6,086,045. The transfer devices disclosed in these publications include a driving roller, a driving roller arranged at a distance from the driving roller, and a transfer belt stretched between the driving roller and the driving roller. The transfer belt is provided with a transfer roller as a charging means for charging the transfer belt with a predetermined polarity so as to face the image carrier with the transfer belt interposed therebetween, and is supplied between the image carrier and the transfer belt. The toner image formed on the surface of the image carrier is sequentially sucked and transferred onto the transfer sheet, and the transfer sheet on which the toner image is transferred is conveyed toward the fixing unit. As described above, the charge charged on the transfer belt to electrostatically attract the toner image formed on the surface of the image carrier is the toner transferred to the transfer paper at the downstream end in the transport direction. In order to stabilize the image and ensure the separation of the transfer paper from the transfer belt, it is desirable that the charge be removed. As the charge eliminating means, it is common practice to ground the drive roller and the driving roller. A technique has also been proposed in which a grounding member such as a grounding roller, which comes into contact with the back surface of the transfer belt, is disposed, and the charge charged on the transfer belt is removed from the grounding member.

[0003]

Thus, in the system in which each roller contacting the back surface of the transfer belt is grounded to eliminate the electric charge charged on the transfer belt as described above, the surface of the transfer belt is charged. It is impossible to surely remove the electric charge caused. That is, the transfer belt is composed of a semiconductive member and has a volume electric resistance value of 10 ⁸ to 10 ^8.
Since the material of about ¹⁵ Ωcm is used, even if each roller that is in contact with the back surface of the transfer belt is grounded to eliminate the electric charge, the electric charge charged on the surface of the transfer belt can be surely removed. You cannot do it.

The present invention has been made in view of the above points, and its main technical problem is to reliably eliminate the electric charges on the surface of the transfer belt at the downstream end in the conveying direction. It is to provide a transfer device for a forming machine.
Other technical problems and characteristics of the present invention will be clarified by the following description.

[0005]

In order to achieve the above main technical problems, according to the present invention, a first roller disposed at the downstream end in the transport direction and a first roller disposed at the upstream end in the transport direction. A belt unit having a second roller, a transfer belt which is stretched over the first roller and the second roller, and which is arranged so as to face the image carrier, and the image carrier is carried on the transfer belt. A charging unit for charging a charge of a predetermined polarity near the position facing the body, a cleaning blade disposed on the opposite side of the image carrier for cleaning the surface of the transfer belt, and toner scraped off by the cleaning blade. In the transfer device of the image forming machine, the cleaning device covers the upper part of the waste toner storage chamber and the transfer roller is provided by the first roller portion. Includes a sealing member in contact of the surface, the seal member is composed of a conductive material is grounded, the transfer device of an image forming apparatus is provided, characterized in that.

[0006]

In the transfer device of the image forming machine according to the present invention, when the transfer belt is charged to a predetermined polarity by the charging means at the time of transfer and the transfer paper is supplied between the image carrier and the transfer belt, The toner image formed on the surface of the image carrier is sequentially attracted and transferred onto the transfer paper by the action of the electric charge charged on the transfer belt at the transfer portion where the transfer belt and the transfer belt face each other. The transfer paper on which the toner image is transferred is conveyed by the transfer belt. At the time of this transfer, the electric charges charged on the transfer belt are grounded and eliminated via a conductive sealing material that contacts the surface of the transfer belt. Therefore, the electric charge charged on the surface of the transfer belt is surely removed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the accompanying drawings showing a preferred embodiment of a transfer device for an image forming machine constructed according to the present invention.

FIG. 1 is a schematic diagram showing an embodiment of an image forming machine equipped with a transfer device according to the present invention, and FIG. 2 is a front view of an image forming machine equipped with a transfer device according to the present invention.

The image forming machine 2 shown in FIG. 1 includes an image carrier 3 which is a rotatably mounted photosensitive drum. Around the image carrier 3, the corona discharger 4 for charging, the developing device 5 and
A transfer device 6, a cleaning unit 7 and a discharge lamp 8 configured according to the present invention are provided. The illustrated image forming machine 2 includes an irradiation lamp 9, a first mirror 10, a second mirror 11, a third mirror 12, a lens 13, and a fourth mirror 14 which are arranged above the image carrier 3. It is equipped with an optical system. This optical system includes an irradiation lamp 9
An original placed on an original placing transparent plate (not shown) is irradiated with the reflected light image by the first mirror 10, the second mirror 11, the third mirror 12, the lens 13 and the fourth mirror 14. An image is formed on the image carrier 3 via the above. The image forming machine 2 includes a transfer paper supply device 15 for supplying the transfer paper to the transfer device 6.
The transfer paper supply device 15 includes a transfer paper cassette 16 for storing transfer paper, a transfer paper feed roller 17, and a separation roller pair 1.
8, a guide path 19, a conveyance roller pair 20, a guide path 21, and a registration roller pair 22. Further, a fixing roller pair 23 and a discharge roller pair 24 are arranged on the transfer paper delivery side of the transfer device 6. In the image forming machine configured as described above, each member arranged below the one-dot chain line in FIG. 1 is arranged in the lower housing 25 constituting the clamshell type machine body housing shown in FIG. Figure 1
In the upper housing 26, the respective members arranged above the one-dot chain line in FIG. The lower end of the upper housing 26 on the right side in FIG. 2 is attached to the lower housing 25 so as to be pivotable by a shaft 27. The transfer device 6 is arranged in the central portion of the lower housing 25 as shown by the chain double-dashed line in FIG. Also, the lower housing 2
An opening 28 for mounting the transfer paper cassette 16 is formed in the front side plate of No. 5.

The image forming machine 2 configured as described above is
While the image carrier 3 is driven to rotate in the direction of arrow A,
The charging corona discharger 4 charges the photoconductor on the image carrier 3 substantially uniformly to a specific polarity, and then irradiates an original placed on an original placing transparent plate (not shown) with an irradiation lamp 9 to illuminate the original. The reflected light image has a first mirror 10 and a second mirror 1.
The image bearing member 3 is scanned and exposed through the first, third mirror 12, lens 13 and fourth mirror 14 to form an electrostatic latent image on the image bearing member 3. After that, the image carrier 3
The electrostatic latent image on the top is developed into a toner image by the developing device 5. On the other hand, the transfer paper stored in the transfer paper cassette 16 of the transfer paper supply device 15 is delivered from the transfer paper delivery roller 17, and the separation roller pair 18, the guide path 19, and the transport roller pair 2 are provided.
0, the guide path 21 and the registration roller pair 22 to be conveyed to the transfer device 6. The transfer paper conveyed to the transfer device 6 is transferred between the image carrier 3 on which the toner image is formed and a transfer belt of the transfer device 6, which will be described later, to transfer the toner image, and then the fixing roller pair 23 fixes the toner image. Then, it is discharged from the discharge roller pair 24. Further, in the image carrier 3 which has completed the transfer process as described above, the toner adhering to the surface of the photoconductor is removed by the cleaning unit 7, and further, the surface of the photoconductor is irradiated with the neutralization light by the neutralization lamp 8. And the electricity is removed.

Next, the transfer device 6 will be described with reference to FIGS. 3 to 20. 3 is a perspective view of a transfer belt unit constituting the transfer device, FIG. 4 is a plan view of the transfer belt unit, FIG. 5 is a front view showing a part of the transfer belt unit in a cutaway view, and FIG. 6 is a cross section of the transfer belt unit. It is a figure. The illustrated transfer belt unit 29 includes a belt unit 30 and a unit housing 60 that houses and supports the belt unit 30.

The belt unit 30 will be described mainly with reference to FIGS. 7, 8 and 9. The illustrated belt unit 30 comprises a support frame 31 as clearly shown in FIG. This support frame 31
Has a base portion 32 and end walls 33 and 34 formed at the front end and the rear end of the base portion 32, respectively, which are integrally molded of synthetic resin. End walls 33 and 3
4 includes notches 331, 332, 333 that open upward.
And 341, 342, 343 are formed respectively.
On the end walls 33 and 34, support plates 35 and 36 made of synthetic resin for supporting each roller described later are formed.
Are attached by screws 37 and 38 (only the support plate 36 side is shown in FIG. 7). Cylindrical stoppers 351 and 361 are integrally formed at the central portions of the support plates 35 and 36 so as to project to the front side (upper left side in FIG. 7) and the rear side (lower right side in FIG. 7), respectively. The stoppers 351 and 361 have a function of coming into contact with the lower surface of a holder that rotatably supports the image carrier 3 and defining the positional relationship between the belt unit 30 and the image carrier 3. Further, on the end walls 33 and 34 of the support frame 31, support plates 39 and 40 formed of synthetic resin for supporting a drive roller described later are mounted. The supporting plates 39 and 40 are rotatably connected by a pin 41 (only the supporting plate 40 side is shown in FIG. 7) at the end portions on the supporting plate 35 and 36 side,
The screw 42 (only the support plate 36 side is shown in FIG. 7) is fixed. On the outer surface of the support plates 39 and 40, the mounting portions 391 and 401 on the disk are provided.
Are provided respectively, and the mounting portions 391 and 401 are provided.
Has two faces 392, 392 and 4 parallel to the outer circumference of each.
02 and 402 are formed (see FIG. 4).

A drive roller 43, which is a first roller located at the downstream end of the belt unit 30 in the conveying direction, is disposed between the support plates 39 and 40. The drive roller 43 is formed of a hollow material made of an aluminum alloy as shown in FIG. 8, and has a rotating shaft 431 at its front end (left end in FIG. 8) and rear end (right end in FIG. 8).
And 432 are attached. Front rotation shaft 43
1 is rotatably supported by a bearing 44 arranged on the support plate 39. A gear 45 is mounted on the front rotary shaft 431, and an engaging groove 451 formed on the side surface of the gear 45 engages with a pin 452 arranged to radially penetrate the rotary shaft 431. The rotary shaft 43
It is configured to rotate integrally with 1. Further, a hole 461 for inserting a mounting bolt is formed at the front end of the rotating shaft 431.
An attachable / detachable member 46 provided with and 462 is rotatably attached. The attaching / detaching member 46 is provided with a position restricting means 465 including a guide portion 463 having a conical surface and a fitting portion 464 formed continuously on the outer circumference of the guide portion 463. The function of the detachable member 46 thus configured will be described later. The rotary shaft 432 on the rear side is the support plate 4 described above.
It is rotatably supported by a bearing 441 arranged at 0. A position restricting member 47 is rotatably mounted on the rear rotary shaft 432, and the position restricting member 47 is pressed to the right in FIG. 8 by a coil spring 475 disposed between the position restricting member 47 and the mounting portion 401. Has been done. The position regulating member 47 includes a guide portion 471 having a conical surface and the guide portion 47.
It is composed of a fitting portion 472 and a flange portion 473 which are continuously formed on the outer periphery of the No. 1. The function of the position restricting member 47 thus configured will be described later. A driven gear 48 is mounted on the rear rotary shaft 432, and the gear 48 has a pin in which an engagement groove 481 formed on a side surface of the gear 48 penetrates the rotary shaft 432 in a radial direction. By engaging with 482, it is configured to rotate integrally with the rotating shaft 432.

A driven roller 49, a transfer roller 50, a tension roller 51, and a ground roller 52, which are a second roller, are arranged between the support plates 35 and 36. Since the support structure on the support plate 35 side and the support structure on the support plate 36 side of each roller are the same in the illustrated embodiment, only the support structure on the support plate 36 side is shown in FIG.

The driven roller 49 is the belt unit 3
The drive roller 43 at the upstream end in the transport direction as 0
And are arranged in parallel at a predetermined interval. The driven roller 49 is made of a columnar material made of aluminum alloy, and both ends thereof have a reduced diameter rotating shaft 491. The rotating shaft 491 is mounted on the support plate 36 (35) with a bearing 53. It is rotatably supported by.

The transfer roller 50 comprises a rotating shaft 501 formed of a cylindrical material made of steel and a sponge-like roller portion 502 mounted on the outer peripheral surface of the rotating shaft 501 with a conductive adhesive. (See Figure 6). The roller portion 502 is configured by impregnating a roll member formed of a foamed material such as urethane foam or silicon foam with a conductive substance such as carbon, and its volume electric resistance value is set to 10 ² to 10 ⁹ Ωcm. Has been done. As a method of impregnating a conductive material into the roll member constituting the roller portion 502, for example, a solution of powder of a conductive material such as carbon is formed of foam such as urethane foam or silicon foam. A method may be used in which the roll member is dipped, a solution of a powder of a conductive substance is permeated into the roll member, and then the roll member is dried. Also,
The hardness of the roller portion 502 is set within a range of 0.45 mm to 2.00 mm with a linear pressure of 3 g / cm and a compression amount.
Thus, the roller portion 502 of the transfer roller 50 has a hardness of linear pressure of 3 g / cm and a compression amount of 0.45 mm to 2.00.
The reason why it is made of a comparatively soft material such as a foamed material such as urethane foam, foamed silicon, etc. of mm is as follows. That is, according to the test by the present inventors, when the roller portion of the transfer roller is made of a relatively hard material such as hard rubber, the pressure at the transfer point is high, and there is no problem with normal transfer paper, but the overhead projector ( It has been found that when toner is difficult to adhere to, such as a film for OHP), a so-called hollow image phenomenon in which the center of the line remains on the image carrier side easily occurs. Therefore, the present inventors have tested various transfer rollers made of foamed urethane. The volume electric resistance value of the roller portion of the transfer roller is 10 ⁵ Ω.
cm, the volume electric resistance value of the transfer belt was 10 ¹¹ Ωcm, and the applied voltage of the transfer roller was 2.5 kV. Test results,
Roller hardness is linear pressure 3g / cm and compression amount is 0.45m
If it is harder than m, a so-called hollow phenomenon occurs when transferring to an overhead projector (OHP) film, and if the hardness of the roller portion is lowered, a so-called hollow phenomenon does not occur. However, when the linear pressure is 3 g / cm, the compression amount is 2.00
If the hardness of the roller portion is less than 10 mm, the predetermined frictional force cannot be obtained and it is difficult to rotate with the transfer belt, and the surface of the roller portion is damaged by the shearing force generated between the transfer belt and the roller portion. I found out that Therefore, the hardness of the roller portion of the transfer roller is 0.
It has been found that a range of 45 mm to 2.00 mm is desirable. Both ends of the rotary shaft 501 constituting the transfer roller 50 are rotatably supported by bearings 54 mounted on the support plate 36 (35). The bearing 54 extends from the inner surface of the support plate 36 (35) to the stopper 361 (351) at a position facing the cylindrical stopper 361 (351).
It is arranged at a position embedded in the side. Therefore, the toner powder and dust from the inside of the support plate 36 (35) may be absorbed by the bearing 54.
It's hard to break into. The rotating shaft 501 of the transfer roller 50 is configured so that a predetermined voltage is applied by the voltage applying unit 200 shown in FIG. 1, and the voltage applying unit 200 and the transfer roller 50 form a transfer belt described later. A charging means for charging a charge having a predetermined polarity is configured.

The tension roller 51 is arranged between the driven roller 49 and the transfer roller 50,
The rotary shaft 511 is formed of a columnar material made of an aluminum alloy, and both ends thereof have a reduced diameter.
11 is rotatably supported by a bearing 55 mounted on the support plate 36 (35).

The earth roller 52 is disposed between the transfer roller 50 and the driving roller 43 and is formed of a columnar material made of aluminum alloy, and both ends thereof become a reduced diameter rotating shaft 521. The rotary shaft 521 is rotatably supported by a bearing 56 mounted on the support plate 36 (35). The earth roller 52 is body-grounded to the body housing by an appropriate earthing means. The positional relationship among the earth roller 52, the tension roller 51, and the transfer roller 50 is configured as follows. That is, the transfer roller 50 is arranged such that the upper end of the outer peripheral surface thereof is located below the straight line connecting the outer peripheral surface upper ends of the earth roller 52 and the tension roller 51 in the figure. Therefore, the transfer roller 50 is separated from the transfer belt 57 in a state where the transfer belt 57, which will be described later, is stretched over the respective rollers (see FIG. 6).

The drive roller 43, the driven roller 49, the transfer roller 50, and the tension roller 51 mounted on the support plates 39 and 40 and the support plates 35 and 36 as described above.
Also, the endless transfer belt 57 is attached to the ground roller 52.
Is wrapped around. The transfer belt 57 is made of a semiconductive material such as polychloroprene,
The volume electric resistance value is set to 10 ⁹ to 10 ¹² Ωcm. When the transfer belt 57 is mounted on the rollers, the support plates 39 and 40 are attached to the support frame 31.
Of the support plates 39 and 40 and the end walls 33 and 34 of the support frame 31 are released by loosening the screws 42 fixed to the end walls 33 and 34 of the support plates 39 and 40 with the pin 41 as the center. Turn it. In this way, the support plate 3
The transfer belt 57 can be easily fitted on each of the rollers by rotating 9 and 40 around the pin 41 as a fulcrum. Next, the support plates 39 and 40 are rotated to their original positions by using the pins 41 as fulcrums and the screws 42 are tightened, so that the transfer belt 57 can be attached with a predetermined tension. The width dimension of the transfer belt 57 is
The distance between the supporting plates 35 and 39 and the supporting plates 36 and 40 is larger than the distance between the supporting plates 35 and 39, and both ends thereof are
And 39 and the support plates 36 and 40 at the center. Therefore, the toner powder adhering to the transfer belt 57 is transferred to the support plates 35 and 39, the support plates 36 and 40, and the transfer belt 5.
It is difficult to enter the space formed by 7.
In order to prevent the transfer belt 57 from meandering when the transfer belt 57 is operated, meandering preventing members 58, 58 are attached to the upper surfaces of the support plates 39, 40.

Next, the unit housing 60 for accommodating and supporting the belt unit 30 will be described with reference to FIG. The unit housing 60 in the illustrated embodiment has a front side wall 63 and a rear side wall 64 as shown in FIG.
A bottom wall 65, a left side wall 66 and a right side wall 67, the upper side of which is open, and these are integrally formed of synthetic resin. In the upper part of the front side wall 63 and the rear side wall 64 on the left side wall 66 side in FIG. 10, the mounting portions 391 and 401 provided on the support plates 39 and 40 that pivotally support the drive roller 43 of the belt unit 30 are rotated. Circular support holes 631 and 641 are formed for possible support. The circular support holes 631 and 641 correspond to the diameters of the mounting portions 391 and 401 and are open at the upper side, and the opening widths thereof are two parallel surfaces 392, 392 formed on the mounting portions 391 and 401. It corresponds to the width across flats of 402 and 402. Therefore, the two parallel surfaces 392, 392 and 402, 40 of the mounting portions 391 and 401 are
2 is inserted into and fitted into the circular support holes 631 and 641 from above so as to correspond to the open portions of the circular support holes 631 and 641, and the belt unit 30 is pivoted about 90 ° about the mounting portions 391 and 401 as fulcrums. The belt unit 30 can be attached to the unit housing 60. Further, the right side wall 6 of the front side wall 63 and the rear side wall 64
The end portions on the 7th side are formed so as to project to the front side and the rear side, respectively, and the stopper 3 of the belt unit 30 is provided above the end portions.
Notch 632 to allow movement of 51 and 361
And 642 are formed respectively. A mounting portion 634 projecting below the bottom wall 65 is provided on the protruding portion of the front side wall 63 where the cutout portion 632 is formed, and the mounting portion 634 has an elliptical shape as shown in FIG. Positioning hole 635 and an oval mounting bolt insertion hole 636 are formed. In addition, a portion of the front side wall 63 slightly left of the center in FIG. 5 is formed so as to project downward,
An engaging hole 633 is provided in the protrusion at a position corresponding to a slide rail described later. The bottom wall 65 is provided with a slide rail 654 which is formed to project downward at a position corresponding to the engagement hole 633 formed in the front side wall 63 and extends from the front end to the rear end. This sliding rail 65
4 is a guide 655, 656 that projects downward on both sides.
And a sliding surface 65 formed between the guides 655 and 656.
7, the sliding surface 657 is formed at substantially the same position as the upper end of the engaging hole 633 formed in the front side wall 63. An opening 651 is formed in the center of the bottom wall 65, and openings 652 and 653 are formed at the front and rear ends of the right wall 67. This opening 651, 652
The functions of 653 and 653 will be described later.

Left side wall 66 of the unit housing 60
On the side, as shown in FIG. 6, a waste toner container 680 which constitutes the cleaning means 68 is formed along the left side wall 66 in the front-rear direction. A toner conveying member 69 is arranged below the waste toner container 680. The toner conveying member 69 includes a rotating shaft 691 and a spiral blade 692 attached to the rotating shaft 691. In this toner conveying member 69, one end of a rotary shaft 691 is rotatably supported on the front side wall 63, and the other end is opened to the waste toner container 69 and protrudes rearward from the rear side wall 64. A part of the spiral blade 692 is rotatably supported by the guide tube 693 provided (see FIG. 10). A driven gear 70 is attached to one end of the rotary shaft 691, and the driven gear 70 is rotatably supported by a shaft 713 on the front side wall 63 and a small gear 711 of an intermediate gear 71 as shown in FIG. It is in mesh. The intermediate gear 71 is the small gear 711.
And a gear wheel 712, which is mounted on the rotary shaft 431 of the drive roller 43.
5 is configured to mesh with. Also, the rotating shaft 69
The other end of 1 projects from the tip of the guide cylinder 693, and a closing plate 694 having an outer diameter substantially the same as the outer diameter of the guide cylinder 693 is attached to the tip. A closed cylinder 72 is fitted into the guide cylinder 693 as shown in FIG.
The closing cylinder 72 is provided with an engagement groove 721 formed in the axial direction from the inner end thereof, and the engagement groove 721 is formed in the guide cylinder 6.
By engaging with the ridge 695 provided on 93, it is possible to move in the axial direction but the rotation is restricted. The closed cylinder 72 has a flange 722 at its inner end,
The coil spring 723 disposed between the flange 722 and the rear side wall 64 pushes it backward.

The unit housing 60 is provided with a cleaning mechanism 73 which constitutes a cleaning means 68 for cleaning the transfer belt 57 together with the waste toner storage section 680. The cleaning mechanism 73 in the illustrated embodiment includes a common holder 74 arranged along the waste toner container 680, a cleaning blade 75, and a paper dust removing member 76. The common holder 74 is composed of a channel-shaped member having a length substantially the same as the width of the transfer belt 57, and the mounting portion 7
41 and a supporting portion 742. A mounting member 77 is fixed to the central portion of the support portion 742 of the holder 74. The mounting member 77 is provided at its base with a hole 771 having a circular cross-section with a opening 772 partially penetrating in the longitudinal direction, and the operated lever 773 is integrally formed at the center of the mounting member 77. Has been formed. This mounting member 7
Support shaft 78 for rotatably supporting 7 (see FIG. 6)
Is provided on the bottom wall 65 of the unit housing 60. The support shaft 78 is integrally formed with support walls 79, 79 formed so as to stand upright from the bottom wall 65.
Two parallel surfaces corresponding to the diameter of 1 and corresponding to the opening width of the opening 772 are formed on the outer circumference. Mounting member 77
In order to attach the mounting member 77 to the support shaft 78, the opening 772 is made to correspond to the two parallel surfaces formed on the support shaft 78, the hole 771 is fitted to the support shaft 78 from above, and the mounting member 77 is set to approximately 90 °. By turning, the actuated lever 773 is positioned so as to project from the opening 651 formed in the bottom wall 65, as shown in FIGS. 6 and 10. The cleaning blade 75 is formed of urethane rubber or the like and has a length approximately the same as the width of the transfer belt 57, and is fixed to the mounting portion 741 of the holder 74 with an adhesive or the like. The edge of the cleaning blade 75 is pressed against the transfer belt 57 during transfer (see FIG. 20).
(Refer) The toner adhering to the transfer belt 57 is scraped off. The paper dust removing member 76 is made of a foam material such as sponge and has a length substantially the same as the width of the transfer belt 57 like the cleaning blade 75, and an adhesive agent or the like is attached to the mounting portion 741 of the holder 74. Is stuck by. The paper dust removing member 76 is disposed on the downstream side of the cleaning blade 75 in the operating direction of the transfer belt 57, and is formed thicker than the cleaning blade 75. The part is configured to be in contact with the transfer belt 57. The paper dust removing member 76 removes the paper dust adhered to the transfer belt 57 which is difficult to remove with the cleaning blade 75, and the toner accumulated at the contact position when the cleaning blade 75 is separated from the transfer belt 57. It has the function of smoothing. At the upper end of the left side wall 66 of the unit housing 60, a seal plate 80 that covers above the waste toner storage portion 680 is mounted. This seal plate 80
Has a surface formed in an arc shape corresponding to the outer peripheral surface of the drive roller 43, extends from the front side wall 63 to the rear side wall 64, and has a conductive member 80 such as a metal plate on its surface.
0 is installed. The conductive member 800 mounted on the seal plate 80 is body-grounded to the body housing. The transfer belt 5 is attached to the conductive member 800.
A conductive seal member 81 that contacts 7 is bonded by a conductive adhesive material. This conductive seal member 81
Is disposed so as to fill the gap between the transfer belt 57 and the conductive member 800 mounted on the seal plate 80. Therefore, the tightness of the waste toner storage portion 680 can be improved, and the waste toner storage It is possible to prevent the toner from being blown out from the portion 680. The conductive seal member 8
1 can be formed by mixing carbon fiber into polymer resin fiber. Further, like the transfer roller 50, a sealing member is formed of a foam material such as urethane foam, silicon foam, sponge, and felt, and the sealing member is dipped in a solution in which a powder of a conductive substance such as carbon is dissolved. A conductive sealing material can be formed by a method of allowing a solution of a powder of a conductive substance to permeate and then drying the solution. Therefore, the charge charged on the transfer belt 57 is
From the surface thereof, it passes through the conductive sealing material 81, the conductive member 800, and flows to the body housing to be discharged. The cleaning blade 75 of the seal plate 80
The sealing material 81 is also attached to the portion facing the sealing material 81, and the edge portion of the cleaning blade 75 contacts the sealing material 81 during non-transfer as shown in FIG. Therefore, it is possible to remove the toner, paper dust, and the like adhering to the edge portion of the cleaning blade 75 each time non-transferring.

Next, the transfer belt unit 29 constructed as described above is installed in the lower housing 2 of the clamshell type.
The slider mechanism to be mounted on the No. 5 will be described with reference to FIGS. 11 to 20. The lower housing 25 includes a front side plate 85, a rear side plate 86 arranged at a distance from the front side plate 85, and a substrate 90 arranged between the front side plate 85 and the rear side plate 86. As shown in FIG. 12, the front side plate 85 has the removable member 4 in the transfer belt unit 29.
A circular support hole 851 corresponding to the fitting portion 464 of No. 6 and having an open upper portion, a rectangular cutout portion 852 corresponding to the mounting portion 634 formed on the front side wall 63 of the unit housing 60, and described later. A hole 853 that engages with the locking portion of the slider is provided. As shown in FIG. 13, the rear side plate 86 is provided with a hole 861 corresponding to the fitting portion 472 of the position regulating member 47 of the transfer belt unit 29 and a hole 862 for allowing the closed cylinder 72 to be inserted therethrough. There is.

A slider 87 extending between a front plate 85 and a rear plate 86 is arranged on the substrate 90 of the lower housing 25. The slider 87 is made of a steel material having a channel-shaped cross section, and its width is the sliding surface 6 formed between the guides 655 and 656 of the sliding rail 654.
The upper plate 8 has a size corresponding to the width of 57.
The upper surface of 71 serves as a mounting surface 871a for mounting the sliding surface 657 of the sliding rail 654. Slider 8
The first and second elongated holes 873 and 873 and the second elongated holes 874 and 874 that extend in the front-rear direction at the rear end portions (the upper side in FIG. 11, the right side in FIGS. 15 to 18) of the two side plates 872 and 872 of FIG. Is provided. The first elongated holes 873 and 873 provided on the rear end side are formed in a straight line parallel to the mounting surface 871a. The first elongated holes 873, 87
Second elongated holes 874, 874 provided on the front end side of
Is a first parallel portion 874a parallel to the placing surface 871a.
And an inclined portion 874b inclined upward from the front end of the first parallel portion 874a, and a second parallel portion 87 parallel to the mounting surface 871a from the upper end of the inclined portion 874b toward the front end side.
And 4c. Both side plates 872, 872
Stoppers 875, 875 projecting upward from the above-mentioned mounting surface 871a are respectively provided at the rear end. The front ends of the side plates 872 and 872 are fitted into holes 853 (see FIGS. 12 and 15) formed in the front plate 85,
Locking recess 87 for holding the slider 87 in a tilted state
A locking portion 876 having 6a is provided. An engaging portion 87 that engages with an engaging hole 633 formed in the front side wall 63 of the unit housing 60 is provided at the front end of the upper plate 871.
7 are provided. The engaging portion 877 and the front side wall 6
The engaging hole 633 formed in the No. 3 constitutes engaging means for engaging with each other. The slider 87 configured in this way is
First elongated holes 87 formed in the side plates 872, 872
The first support pin 88 is inserted through the third and 873, and the second support pin 89 is inserted through the second elongated holes 874 and 874. The first support pin 88 and the second support pin 8
Both ends of 9 are respectively supported by support brackets 901, 901 and 902, 902 formed by cutting and raising a part of the substrate 90. Both side plates 87 of the slider 87
The first elongated holes 873 and 873 and the second elongated holes 874 and 874 formed in the second and 872 and the support bracket 901,
The first support pin 88 and the second support pin 89, which are respectively supported by 901, 902, and 902, include a slider 87.
Is configured so as to be movable in the front-rear direction and swingable in the up-down direction with the rear end as a fulcrum. A tension coil spring 92 is stretched between the second support pin 89 and a locking portion 878 provided on the upper plate 871 of the slider 87 on the rear end side of the second support pin 89. The tension of the tension coil spring 92 constantly urges the slider 87 to move to the front end side. Therefore, the front end of the slider 87 is in contact with the front side plate 85 in the assembled state (see FIG. 11). At this time, the first support pins 88 are attached to the side plates 8 of the slider 87.
The second support pin 89 is located approximately in the middle of the first elongated holes 873, 873 provided in the holes 72, 872, and the second support pin 89 has the inclined portions 874b of the second elongated holes 874, 874 and the second parallel portion 87.
4c and the connecting portion. If the front end of the slider 87 is lifted up from this state,
The slider 87 rotates about the first support pin 88 and the second elongated hole 8 into which the second support pin 89 is inserted.
74, 874 moves to the front end side, and the locking portion 87
6 reaches the hole 853 formed in the front plate 85,
5, the locking portion 876 fits into the hole 853,
The lower edge of 53 and the locking recess 876a of the locking portion 876 are engaged with each other, and the slider 87 is held in a tilted down state with its front end positioned above the upper end of the front side plate 85. At this time, the rear ends of the first elongated holes 873 and 873 are located on the first support pins 88, and the rear ends of the first parallel portions 874a of the second elongated holes 874 and 874 are located at the second support pins. Located on pin 89.

The slider mechanism for mounting the transfer belt unit 29 in the clamshell type lower housing 25 is constructed as described above, and the mounting procedure of the transfer belt unit 29 will be described below. First, the front end portion of the slider 87 is lifted upward, and the locking recess 876a of the locking portion 876 is engaged with the lower edge of the hole 853 formed in the front side plate 85 and is held in an inclined state as shown in FIG. To do. In this state, the sliding surface 657 of the slide rail 654 formed in the unit housing 60 of the transfer belt unit 29 is placed on the mounting surface 871a of the slider 87, and the transfer belt unit 29 is placed on the mounting surface of the slider 87. When it is moved along 871a and reaches the position shown in FIG. 16, the rear end of the slide rail 654 abuts on the stoppers 875 and 875 provided at the rear end of the slider 87. On the other hand, the engaging hole 633 formed in the front side wall 63 of the unit housing 60 engages with the engaging portion 877 provided in the slider 87, and the transfer belt unit 29 and the slider 87 are integrated. At this time, the driven gear 48 mounted on the driving roller 43 of the transfer belt unit 29 has the hole 86 formed in the rear plate 86.
1, the guide portion 471 of the position regulating member 47 is in contact with the upper edge portion of the hole 861. Further, the closing cylinder 7 fitted in the guide cylinder 693 of the toner conveying member 69.
2 is inserted into a hole 862 formed in the rear side plate 86. When the transfer belt unit 29 and the slider 87 are pushed rearward from the state shown in FIG.
Since the engagement between the second support pin 89 and the hole 853 is released, the transfer belt unit 29 and the slider 87 pivot downward with the first support pin 88 as a fulcrum, and the second support pin 89 is inserted into the second support pin 89. Guided by the long holes 874 and 874, FIG.
As shown in FIG. 6, when the front wall 63 is in a substantially horizontal state,
The bottom wall 65 corresponding to the position of 34 abuts on the bottom edge 854 of the notch 852 formed in the front plate 85. At this time, the position regulating member 47 is guided by the guide portion 471 having a conical surface into the hole 861 formed in the rear side plate 86, the fitting portion 472 is fitted and positioned, and the flange portion 473 is positioned at the rear side plate 86. Abut. Further, the closed cylinder 72 fitted into the guide cylinder 693 of the toner conveying member 69 has the hole 9 provided in the waste toner box 95 arranged at the rear of the rear side plate 86.
51, and the flange 722 abuts the rear side plate 86. A small-diameter portion between the detachable member 46 attached to the front end of the drive roller 43 and the gear 45 is fitted into a circular support hole 851 formed in the front plate 85 from its upper opening.
When the transfer belt unit 29 and the slider 87 are pushed further rearward from the state shown in FIG. 17, the mounting portion 634 comes into contact with the front side plate 85 as shown in FIG. At this time,
The positioning pin 9 provided on the front side plate 85 as shown in FIG.
The positioning hole 635 formed in the mounting portion 634 is fitted in the position 6. Further, the attachment / detachment member 46 is guided by the conical surface of the guide portion 463 forming the position regulating means 465 to move in the circular support hole 851, and the fitting portion 464 is moved to the circular support hole 85.
The position is regulated by fitting with 1. In this state, as shown in FIG. 12, the mounting bolt 971 is inserted into the mounting bolt insertion hole 636 formed in the mounting portion 634 and screwed into the screw hole formed in the front side plate 85, and the detachable member 46 By inserting the mounting bolts 972 and 973 into the mounting bolt insertion holes 461 and 462 formed in the above and screwing them into the screw holes formed in the front side plate 85, the transfer belt unit 29 can be installed in the clamshell type lower housing. It can be attached and fixed to 25. On the other hand, on the rear end side of the transfer belt unit 29, the driven gear 48 mounted on the driving roller 43 is rotatably mounted on the short shaft 98 mounted on the rear side plate 86 as shown in FIG. It meshes with a transmission gear 99 that is transmission coupled to the device. Further, the closed cylinder 72 fitted into the guide cylinder 693 of the toner conveying member 69 does not move due to the flange 722 contacting the rear side plate 86, but the guide cylinder 693 moves, so that the front end portion thereof is separated from the closed cylinder 72. The waste toner, which projects into the waste toner box 95 and is conveyed by the toner conveying member 69, can be discharged. When the transfer belt unit 29 mounted on the lower housing 25 as described above is to be removed for part replacement or the like, it can be easily removed by performing the reverse operation of the mounting procedure.

FIG. 19 shows the positional relationship with the image carrier 3 when the transfer belt unit 29 is mounted on the lower housing 25 which constitutes the clamshell type machine housing as described above. That is, the transfer roller 50 of the transfer belt unit 29 is positioned so as to face substantially below the image carrier 3 and a gap is provided between the transfer belt 57 and the image carrier 3. A gap of about 1.00 mm to 2.00 mm is also provided between the transfer belt 57 and the transfer roller 50. In this way, the belt unit 30 of the transfer belt unit 29 mounted on the lower housing 25 constituting the machine housing is rotated around the drive roller 43 by the contacting / separating means to be described later at the time of transfer. Positioned at the transfer position, the transfer belt 57 contacts the outer peripheral surface of the image carrier 3 and is pressed by the transfer roller 50 as shown in FIG. Hereinafter, the contacting / separating means will be described mainly with reference to FIGS. 11, 19 and 20.

The contacting / separating means includes an operating shaft 100 which is disposed in the front-rear direction above the substrate 87 constituting the lower housing 25 and is rotatably supported by the front side plate 85 and the rear side plate 86. A lever 101, which is operated by a cam described later, is attached to the rear end of the operation shaft 100. A cam 102 for operating the lever 101 is mounted on a rotary shaft 103 rotatably supported by the front side plate 85. A tension coil spring 105 is mounted between the lever 101 and the front side plate 85, so that the lever 101 is always in contact with the outer peripheral surface of the cam 102. A driven gear 104 is mounted on the rotary shaft 103, and the driven gear 104 is transmission-coupled to a drive device (not shown). Therefore, when the driven gear 104 is driven to rotate, the action of the cam 102 causes the cam 10 to move.
The lever 101, which is in contact with the outer peripheral surface of 2, rotates in a predetermined angle range, and reciprocally rotates the operating shaft 100 in a predetermined angle range. The operating shaft 100 includes a front plate 85 and a rear plate 86.
The contact and separation actuating levers 106 and 107 made of spring steel are mounted at positions slightly closer to the center. The contact / separation actuating levers 106 and 107 have openings 652 formed in the bottom wall 65 of the unit housing 60 of the transfer belt unit 29 mounted in the lower housing 25.
And 653. In addition, an actuated lever 77 formed on a mounting member 77 for mounting a holder 74 on which the cleaning blade 75 and the paper dust removing member 76 are mounted in the central portion of the operating shaft 100.
A cleaning actuating lever 108 formed of spring steel is attached to the top surface of the cleaning lever 3. The actuated lever 773, the cleaning actuating lever 108, the actuating shaft 100, the lever 101, the cam 102, and the like include the cleaning blade 75 and the paper dust removing member 76.
It constitutes an operating mechanism for operating the holder 74 mounted with the contacting / separating means in correspondence with the operating direction of the belt unit 60, and is operated by a drive source common to the contacting / separating means.

The transfer device of the image forming machine according to the illustrated embodiment is constructed as described above, and its operation will be described below. Transfer belt unit 29 to lower housing 2
When the image forming machine is operated from the state (FIG. 19) mounted on the No. 5 as described above, the driven gear 104 is rotationally driven by the driving device (not shown). When the driven gear 104 is rotationally driven, the cam 102 is also rotated and stopped when the transfer position shown in FIG. 20 is reached. Cam 1
As 02 rotates to the transfer position shown in FIG. 20, the lever 101 in contact with the outer peripheral surface of the cam 102 swings upward to rotate the operating shaft 100 counterclockwise in FIG. Therefore, the contact / separation actuating levers 106 and 107 mounted on the actuating shaft 100 are swung upward and come into contact with the lower surfaces of the support plates 35 and 36 forming the belt unit 30 so that the belt unit 30 is centered around the driving roller. Rotate upward and push up. As a result, the transfer belt 57 is pressed against the image carrier 3 and the transfer roller 5
0 is pressed against the transfer belt 57. By this pressing, the roller portion of the transfer roller 50 is compressed by about 0.5 mm to 1.0 mm, so that the transfer belt 57 can be brought into uniform contact with the image carrier 3 with a predetermined pressing force. on the other hand,
The cleaning actuating lever 108 mounted on the actuating shaft 100 is swung downward, so that the mounting member 77 having the actuated lever 773 in contact with the actuating lever 108 is centered on the support shaft 78. It is rotated clockwise at 20. As a result, the mounting member 77
The holder 74 attached with the cleaning blade 7 is moved to the position shown in FIG.
The edge portion 5 is pressed against the transfer belt 57. Further, in this state, the edge portion of the paper dust removing member 76 mounted on the holder 74 on the cleaning blade 75 side is brought into contact with the transfer belt 57.

Next, when the driven gear 48 is rotationally driven via the transmission gear 99 which is transmission-coupled to the drive device (not shown), the drive roller 43 mounted with the driven gear 48.
Is rotated. When the drive roller 43 rotates, the transfer belt 57 is operated in the arrow B direction. Also,
When the drive roller 43 rotates, the driven gear 70 is rotated via the gear 45 and the intermediate gear 71 mounted on the drive roller 43. When the driven gear 70 rotates, the toner conveying member 69 equipped with the driven gear 70 rotates. On the other hand, the voltage applying means 200 is applied to the transfer roller 50.
A predetermined voltage is applied (see FIG. 1). The transfer belt 57 is charged with electric charges of a predetermined polarity through the transfer roller 50. Therefore, when the transfer paper is supplied between the image carrier 3 and the transfer belt 57, the image carrier is charged by the action of the charges charged on the transfer belt 57 at the transfer portion where the image carrier 3 and the transfer belt 57 face each other. The toner image formed on the surface of No. 3 is sequentially sucked and transferred onto the transfer paper. The transfer paper on which the toner image is transferred is the transfer belt 57.
The sheet is conveyed by, is fixed by the fixing roller pair 23, and is discharged from the discharge roller pair 24. At the time of this transfer, the electric charge charged to the transfer belt 57 by the voltage applying unit 200 via the drive roller 43 is removed via the earth roller 52, and at the same time, the surface of the transfer belt 57 contacts the surface at the downstream end in the transport direction. Sealing member 81
Through the conductive member 800 to the housing of the machine body for static elimination. Therefore, the electric charges charged on the surface of the transfer belt 57 can be reliably removed at the downstream end in the transport direction.
The toner image transferred to the transfer paper can be stabilized, and the transfer paper can be reliably separated from the transfer belt. The toner attached to the surface of the transfer belt 57 is scraped off by the cleaning blade 75 while moving in the direction of the arrow B, and the waste toner container 6
Fall to 8. The toner that has fallen into the waste toner storage portion 68 is transported to the rear side by the toner transport member 69, and is discharged from the tip of the guide cylinder 693 into the waste toner box 95.

Next, at the time of non-transfer, the drive roller 43 is stopped and the voltage application to the transfer roller 50 is cut off. Then, the driven gear 104 is rotationally driven by a driving device (not shown) to position the cam 102 at the position shown in FIG. As the cam 102 rotates to the position shown in FIG. 19, the lever 101 in contact with the outer peripheral surface of the cam 102 swings downward, causing the operating shaft 100 to rotate clockwise in FIG. Therefore, the contact / separation actuating levers 106 and 107 mounted on the actuating shaft 100 are swung downward, so that the belt unit 30 pivots downward about the drive roller and the support plates 35 and 36 are attached to the unit housing 60. The bottom wall 65 is abutted and stopped, as shown in FIG.
The non-transfer position shown in FIG. That is, the image carrier 3 and the transfer belt 57, and the transfer belt 57 and the transfer roller 50 are separated from each other. Therefore, it is possible to prevent the transfer roller 50 from being deformed due to the transfer roller 50 being constantly in contact with the transfer belt 57.
On the other hand, the cleaning actuating lever 108 mounted on the actuating shaft 100 is swung upward, so that the mounting member 77 having the actuated lever 773 in contact with the actuating lever 108 is centered on the support shaft 78. As shown in FIG. 19, it is rotated clockwise. As a result, the holder 74 to which the mounting member 77 is attached operates at the position shown in FIG. 19, and the cleaning blade 75 attached to the holder 74 is separated from the transfer belt 57. Therefore, it is possible to prevent the deformation of the transfer belt 57 caused by the cleaning blade 75 being constantly in pressure contact with the transfer belt 57. Even in this state, the edge portion of the paper dust removing member 76 mounted on the blade holder 74 on the side opposite to the cleaning blade 75 side is brought into contact with the transfer belt 57. As described above, since the paper dust removing member 76 is constantly brought into contact with the transfer belt 57, the toner accumulated and attached at the position where the cleaning blade 75 of the transfer belt 57 was in contact when the belt unit 30 was separated was attached. Even if it moves until it stops due to the inertia of the transfer belt, it is smoothed by the paper dust removing member 76, so that the toner is deposited on the transfer belt in the state of being accumulated at the time of the next transfer, and drops into the machine. Can be prevented in advance.

[0031]

The transfer device of the image forming machine according to the present invention is constructed as described above, and the electric charges charged on the transfer belt by the charging means at the time of transfer are transferred to the surface at the downstream end in the conveying direction after the transfer operation is completed. It is made of a conductive material that comes into contact, and is grounded via a seal member to remove electricity. Therefore, the charge charged on the surface of the transfer belt can be reliably removed at the downstream end in the transport direction, so that the toner image transferred to the transfer paper can be stabilized and the transfer paper can be separated from the transfer belt. You can be sure. Further, since the seal member made of the above-mentioned conductive material uses the seal member covering the upper portion of the waste toner storage chamber constituting the cleaning means, the charge eliminating means can be constructed at low cost. Further, according to the present invention, since the electric charge charged on the surface of the transfer belt can be reliably removed at the downstream end in the transport direction as described above, the downstream end in the transport direction and the rollers arranged at the downstream end in the transport direction can be removed. Since it is not necessary to remove the electric charge charged on the transfer belt, it is possible to configure these rollers with a non-conductive synthetic resin, and it is possible to reduce the weight and to manufacture them at low cost. it can.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an image forming machine equipped with a transfer device configured according to the present invention.

FIG. 2 is a front view of a clamshell type image forming machine equipped with a transfer device configured according to the present invention.

FIG. 3 is a perspective view of a transfer belt unit that constitutes a transfer device configured according to the present invention.

FIG. 4 is a plan view of the transfer belt unit shown in FIG.

5 is a front view showing a part of the transfer belt unit shown in FIG. 3 in a cutaway manner.

FIG. 6 is a sectional view of the transfer belt unit shown in FIG.

7 is a perspective view of a belt unit that constitutes the transfer belt unit shown in FIG.

8 is a cross-sectional view of a driving roller that constitutes the belt unit shown in FIG.

9 is a cross-sectional view showing a support structure of each roller that constitutes the belt unit shown in FIG.

10 is a perspective view of a unit housing constituting the transfer belt unit shown in FIG.

11 is a plan view showing a mounting portion of a machine body housing to which the transfer belt unit shown in FIG. 3 is mounted.

FIG. 12 is a front view showing a state in which the transfer belt unit shown in FIG. 3 is attached to a body housing.

FIG. 13 is a rear view showing a state in which the transfer belt unit shown in FIG. 3 is attached to a body housing.

14 is a perspective view of a slider for mounting the transfer belt unit shown in FIG. 3 in a body housing.

FIG. 15 is a side view showing a state where the slider shown in FIG. 14 is pulled out.

16 is a side view showing a state where the transfer belt unit is placed on the slider shown in FIG.

17 is a side view showing a state where the slider and the transfer belt unit are pushed into the machine housing from a state where the transfer belt unit is placed on the slider shown in FIG.

FIG. 18 is a side view showing a state in which the slider and the transfer belt unit have been moved from the state shown in FIG. 17 to a predetermined mounting position of the machine body housing.

FIG. 19 is a cross-sectional view of the transfer device mounted in the machine housing.

FIG. 20 is a cross-sectional view of the transfer device mounted on the machine body housing in a transfer state.

[Explanation of symbols]

 2: Image forming machine 3: Image carrier 4: Corona discharger for charging 5: Developing device 6: Transfer device 7: Cleaning unit 8: Elimination lamp 9: Irradiation lamp 10: First mirror 11: Second mirror 12 : Third mirror 13: Lens 14: Fourth mirror 15: Transfer paper feeding device 16: Transfer paper cassette 17: Transfer paper feeding roller 18: Separation roller pair 19: Guide path 20: Conveying roller pair 21: Guide path 22 : Registration roller pair 23: Fixing roller pair 24: Ejection roller pair 25: Lower housing 26: Upper housing 29: Transfer belt unit 30: Belt unit 31: Support frame 35: Support plate 36: Support plate 39: Support plate 40: Support plate 43: Drive roller 46: Detachable member 47: Position regulating member 48: Driven gear 49: Driven roller 50: Transfer roller 51 Tension roller 52: Earth roller 57: Transfer belt 58: Meandering prevention member 60: Unit housing 63: Front side wall 64: Rear side wall 65: Bottom wall 66: Left side wall 67: Right side wall 68: Cleaning means 74: Holder 75: Cleaning blade 76: Paper dust removing member 80: Seal plate 81: Conductive seal member 85: Front plate 86: Rear plate 87: Slider 90: Substrate 88: First support pin 89: Second support pin 92: Pull Coil spring 100: Operating shaft 102: Cam 104: Driven gear 105: Tension coil spring 106: Contact / separation operating lever 107: Contact / separation operating lever 108: Cleaning operating lever 654: Sliding rail 680: Waste toner storage unit 800: Conductive member 873: First long hole 874: Second long hole 876: Locking part 877 : Engagement part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Rio Uchida 1-2-2 Tamatsukuri, Chuo-ku, Osaka Mita Kogyo Co., Ltd. (72) Keio Fujita 1-2-2 Tamatsukuri, Chuo-ku, Osaka Mita Within Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A first roller disposed at a downstream end in the transport direction, a second roller disposed at an upstream end in the transport direction, and a tensioning member extending between the first roller and the second roller. A belt unit that includes a transfer belt that is disposed so as to face the image carrier, a charging unit that charges the transfer belt with a charge of a predetermined polarity in the vicinity of a position facing the image carrier, and the image. Transfer of an image forming machine provided with a cleaning blade disposed on the opposite side of the carrier for cleaning the surface of the transfer belt, and a cleaning means having a waste toner storage chamber for storing the toner scraped off by the cleaning blade. In the apparatus, the cleaning means includes a seal member that covers the upper portion of the waste toner storage chamber and that contacts the surface of the transfer belt at the first roller portion, and the seal member is made of a conductive material. Thus is grounded is configured, the transfer device of an image forming machine, characterized in that.