JPH0495976A - Electrophotographic device - Google Patents

Abstract

PURPOSE:To easily release a carrying device from a housing and to facilitate repairing/checking work by releasing, at least, one supporting state of respective supporting means when the carrying device is repaired and checked. CONSTITUTION:A transfer device 5 transferring a developer image on a recording sheet and the carrying device 27 carrying the recording sheet after being transferred are attached to the housing provided on a transfer/carrying device 13. The carrying device 27 is supported with the housing 14 nearby the end parts of the upper and down stream sides in the carrying direction of the recording sheet, by a pair of supporting means 28 and 29, respectively, and at least one supporting means 28 of the respective supporting means 28 and 29 is constituted so as to release the supporting state of the carrying device to the housing 14. When the releasing is carried out, the carrying device 27 is released from the housing 14. Thus, when the carrying device 27 is repaired and checked, at least one supporting state of respective supporting means 17 and 18 is released, so that the carrying device 27 is easily released from the housing 14, and the repairing/checking work can be easily carried out.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electrophotographic apparatus.

A conventional electrophotographic apparatus forms an electrostatic latent image on a charged current photosensitive drum by irradiating it with light, and visualizes this image with toner using a developing device. The toner image on the photosensitive drum is transferred to recording paper. This recording paper is conveyed to, for example, a heat fixing device and fixed thereon, and then discharged outside the machine. At this time, if the transfer area where the transfer action is performed is below the photosensitive drum, a toner image is formed on the upper surface of the recording paper, and therefore the recording paper moves on, for example, a conveyance roller.

On the other hand, if the transfer area is above the photosensitive drum, the toner image will be formed on the bottom surface of the recording paper.

In this case, the recording paper is electrostatically attracted to a conveyor belt made of, for example, a synthetic resin material and sent to the heat fixing device.

Problems to be Solved by the Invention The conveyor belt is wound between a pair of support rollers, and as the driving side support roller is rotationally driven, the conveyor belt is driven to run between it and the driven side support roller. Ru. Each of the support rollers has a structure in which both end portions are rotatably supported by a bearing device fixed to the frame of the body of the electrophotographic apparatus. For this reason, when the conveyor belt is damaged and the conveyor belt is to be replaced, it is necessary to remove each of the support rollers from the frame, which is done by a specialized worker. Similarly, it is difficult to replace the photoreceptor and the developing device, and these tasks are also carried out by specialized workers. For this reason, it has become inconvenient for general users.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned technical problems and provide an electrophotographic apparatus that is much easier to use for the user.

Means for Solving the Problems The present invention provides an electrophotographic apparatus including a transfer conveyance device housed in a machine body, which transfers a developer image onto recording paper and conveys the transferred recording paper. A transfer device and a recording paper conveyance device are installed in the housing, and the conveyance device is supported by a pair of support means in the housing near an upstream end and a downstream end in the recording paper conveyance direction, respectively. and at least one of the supporting means is configured to be able to release the supporting state of the conveying device from the housing, and by releasing the supporting means on at least one side, the conveying device is released from the housing. This is an electrophotographic device characterized by:

Further, in the present invention, the conveyance device includes: a pair of support rollers; an endless conveyance belt made of a dielectric material wound between each support roller; a frame attached to the support roller, and one of the support rollers on one side of the pair of support rollers has one support means attached to the housing near an end on either an upstream side or a downstream side in the conveyance direction of the recording paper. An electrophotographic apparatus, characterized in that the frame is rotatably supported by the housing, and the frame has an engaging piece protruding from the other supporting means provided in the housing so as to be able to engage with and disengage from the other supporting means. It is.

Function: In the electrophotographic apparatus according to the present invention, the transfer conveyance device is housed within the body. A transfer device that transfers the developer image onto recording paper and a transportation device that transports the transferred recording paper are attached to a housing provided in the transfer and conveyance device. This conveyance device is supported by a housing by a pair of support means near an upstream end and a downstream end in the conveyance direction of the recording paper, and at least one of the support means is connected to the housing of the conveyance device. The transport device is configured to be able to release the supporting state thereof, and by releasing the support means on at least one side, the transport device is released from the housing.

Therefore, by releasing the supporting state of at least one of the supporting means when repairing and inspecting the conveyance device, the conveyance device can be easily released from the housing, and the repair and inspection work can be easily performed.

Further, the conveyance device includes a pair of support rollers, an endless conveyance belt wound around these, and a frame between the support rollers. At this time, one side support roller of the pair of support rollers is rotatably supported by the housing by one support means, and the other side support roller is supported by an engagement piece provided on the frame body and the other side support roller provided on the housing. When the engagement state with the support means is released, it is released from the housing. In the case of the conveyance device having such a configuration example, the above-mentioned repair and inspection work can be easily performed.

Embodiment FIG. 1 is a sectional view of an electrophotographic apparatus 1 according to an embodiment of the present invention, FIG. 2 is a plan view of the electrophotographic apparatus 1, and FIG. 3 is a front view of the electrophotographic apparatus 1. , FIG. 4 is a perspective view of FIG. 3, and FIG. 5 is an exploded perspective view of the electrophotographic apparatus 1. The outline of this embodiment will be explained with reference to these drawings. The electrophotographic apparatus 1 includes a main corona discharger 3 , a developing device 4 , a corona discharger 5 , and a cleaning device 6 around the photosensitive drum 2 .

A lid member 8 is attached to the main body 7 of the developing device 4.
The upper surface is a guide surface 9 for feeding recording paper to the photosensitive drum 2.
On the lower surface of the main body 7 used as a
6.47.48 shall be provided. A light source device 10 is disposed between the main corona discharger 3 and the developing device 4, and irradiates light onto the photosensitive drum 2 uniformly charged by the main corona discharger 3 to form an electrostatic latent image. do. The developing roller 11 of the developing device 4 deposits toner on such a photosensitive drum 2 and visualizes the toner.

The corona discharger 5 is connected to the photosensitive drum 2 from the guide surface 9.
The toner image is transferred to the recording paper supplied to the upper transfer area of the recording paper, and the conveyor belt 12 that conveys the recording paper with the toner image transferred thereon by electrostatic attraction from above is charged. The corona discharger 5, the conveyance belt 12, and the like are provided in a transfer conveyance device 13. The transfer conveyance device 13 includes a housing 14, and the shield case 15 and discharge wire 16 of the corona discharger 5 are detachably fixed to the housing 14. Further, the housing 14 is rotatably provided with registration rollers 17 and 18 which are driven to rotate in the directions of arrows Al and A2, respectively, by a motor (not shown).

FIG. 6 is a side view of the vicinity of the registration rollers 17, 18 as seen from the downstream side in the recording paper conveyance direction 81 shown in FIG. It is a perspective view seen from below. With reference to FIGS. 6 and 7 together, the configuration related to the dystrollers 17 and 18 will be described. The registration roller 17 has a configuration in which a rubber roller 127 is attached concentrically to a rotating shaft 126. The rotation shaft 126 is attached to the side plate 14a of the transfer conveyance device 13 via a sliding bearing 146 formed in a cylindrical shape from, for example, a synthetic resin material with a low coefficient of friction, and the tip thereof protrudes from the side plate 14a and is attached to the registration roller 14. It is concentrically fixed to a gear 128 for transmitting power to.

The other end of the rotating shaft 126 in the axial direction is on the side of the housing 14!
14b via a sliding bearing 147 made of the same material as the sliding bearing 146. The tip of the rotating shaft 126 protrudes from the side wall 14b and rotatably passes through a gear 129 and a clutch plate 152 made of a ferromagnetic material such as iron, which is integrally formed with the gear 129, and connects to the rotor 130a of the electromagnetic clutch 130. Fixed. That is, the electromagnetic clutch 13
In response to power being energized/deenergized to the coil 130b of 0, the power transmitted to the gear 129 is transmitted/cut off to the rotating shaft 126 and thus to the registration roller 17, as will be described later.

On the other hand, the registration roller 18 is formed of, for example, stainless steel into a right cylindrical shape, and both ends of its rotating shaft 153 in the axial direction are inserted into the mounting grooves 150, 151 formed in the side plates 14a, 14b of the housing 14, as described above. It is mounted and held via sliding bearings 148 and 149 made of the same material as the bearing 146.

An end portion of the rotating shaft 153 on the side plate 14a side further projects outward from the side plate 14a, and a gear 154 meshes with the gear 128.
fixed concentrically. Therefore, the registration roller 17,
18 are rotationally driven in synchronization with each other.

Further, the gear 129 is connected to the drive gear 13 through gears 131, 132, and 133 rotatably provided on the side plate 14b.
4, and transmits power transmitted from a motor (not shown) to the drive gear 134 to the registration rollers 17 and 18.

In such registration rollers 17 and 18, in order to ensure separation and conveyance operation of the recording paper, the registration roller 1
8 must be elastically pressed against the registration roller 17. In this embodiment, the details of the developing device 4 are shown in FIG.
A pair of leaf springs 142a and 142b are provided in a portion of the lid member 8 directly below the registration roller 18, and this leaf spring 1
The registration roller 18 is pressed against the registration roller 17 by the spring force of 42a and 142b. The leaf spring 142a has a mounting portion 143a attached to the lid member 8 and a mounting portion 1.
For example, an inclined part 144a that extends upward in the width direction of the lid member 8 from 43a, and a pressing part 145a that contacts and presses the sliding bearing 148149 of the registration roller 18 from below are integrated. , for example, made of a metal material with spring properties. The leaf spring 142b also has the same configuration as the leaf spring 142a, and the subscript "a" is changed to "su" for the portion corresponding to the leaf spring 142a. The recording paper conveyed by the conveyor belt 12 is transferred to a heat fixing device 125.
It is established in

In the configuration related to the registration rollers 17 and 18, the gears 128 and 154 are removed, and the registration roller 18 is configured to be able to move toward and away from the registration roller 17 by a slight distance in the mounting grooves 150 and 151, and the plate spring 1
The registration roller 18 is moved by the spring force of 42a and 142b.
An embodiment in which the registration rollers 18 are elastically pressed against the registration rollers 17 and the registration rollers 18 are rotationally driven by mutual frictional force is also included within the scope of the present invention.

The upstream end of the housing 14 in the recording paper feeding direction (indicated by arrow B1 in FIG. 2) extends in a direction perpendicular to the paper feeding direction B1 and is angularly displaced around a pivot shaft 19 parallel to the orthogonal direction. A freely swinging member 20 is mounted. The swinging member 20 is biased in the direction of arrow B3 by a spring (not shown).

At both ends of the swinging member 20 in the orthogonal direction, engaging claws 21 and 22 that protrude downward are integrally formed.

The engaging claws 21 and 22 are connected to pins 24 and 25 that are protruded from the electrophotographic device FIO frame 23 in mutually opposing directions.
It can be fitted into and removed. Further, a guide plate 26 is provided protruding from the housing 14 to face the guide surface 9 of the lid member 8 and guide the recording paper through the lower part of the swinging member 20. A plurality of mounting holes 45a, 46a, 47a, and 48a are formed near the upstream end of the frame 23 in the paper feeding direction B1.
The engaging legs 45 to 48 of the developing device 4 are fitted.

A conveying device 27 is detachably provided within the housing 14 on the downstream side of the corona discharger 5 in the sheet feeding direction B1, as will be described later. The conveying device 27 includes the conveying belt 12, a driving roller 28 around which the conveying belt 12 is wound, and a driven roller 2.
9, and the rollers 28 and 29 constitute support rollers.The driving roller 28 has a cylindrical body 30 made of a metal material such as stainless steel and a rotating shaft 31 concentrically provided, and the cylindrical body 30 is connected to an external ground potential through the rotating shaft 31 and a conductive plate 32 installed between the rotating shaft 31 and the rotating shaft 31 .

Further, at the downstream end of the housing 14 in the sheet feeding direction, a static eliminating brush 33 is provided to neutralize the static electricity from the conveyor belt 12 . A pair of engagement pieces 34 and 35 are provided at both ends of the housing 14 downstream in the paper feeding direction 81 in the orthogonal direction, and engagement holes 36 and 37 are formed therein, respectively. Housing 14
A pair of abutting members 383 are fixed near the base end portions of the engaging pieces 34, 35. The abutment members 38 and 39 have one end fixed to the frame 14, and a connecting portion 40 and 40a that extend in opposite directions in parallel with the orthogonal direction, and a connecting portion 40 and 40a that hangs down from the tip thereof over a length Ll in the vertical direction. Drooping part 41
．． 41a, and abutting portions 42, 42a extending in a direction close to each other from their distal ends.

The engaging piece 34 is attached to the side wall 43,44 of the frame 23.
, 35, into which the engagement holes 36 and 37 of the bearing 4 are removably fitted.
9, 50 are fixed, each holding an axle 51, 52 thereon. A fitting groove 53 is formed at the inner end of the shaft 52 .

The photosensitive drum 2 is attached to a frame 55 that rotatably supports a shaft 54 coaxially fixed to the photosensitive drum 2 over the entire length of the photosensitive drum 2. The cleaning device 6 is provided integrally with this frame 55, and the photosensitive drum unit 13
5 is composed. The releaning device 6 includes a housing 5
A cleaning blade 57 in the photosensitive drum 6 removes toner remaining on the photosensitive drum 2 after the transfer.

A pair of contact pieces 58 and 59 extending upward are integrally formed at both ends of the frame 55 in the orthogonal direction.

The abutting pieces 58 and 59 each include upright portions 60 and 60a that protrude upward from the frame 55, and abutting pieces 61 and 61a that extend toward each other from their tips. The corresponding contact pieces 61, 61a are the photosensitive drum unit 13.
5 is attached to the frame 23, it comes into contact with the contact portion 42.degree. 42a of the transfer conveyance device 13. Contact piece 58,5
The photosensitive drums 2 are placed on the frame 55 closer to each other than 9.
Abutment pieces 123 and 124 are integrally formed extending from the upper end at a height H2.

An opening 62 extending in the orthogonal direction is formed below the arrangement position of the photosensitive drum 2 in the frame 23, and the light source device 10 extending in the orthogonal direction faces the photosensitive drum 2 from below through the opening 62.

The light source unit [10 is a light source unit 136 that includes, for example, a large number of LED (light emitting diode) rows and an optical system such as a lens.
A pair of substantially Y-shaped support pieces 63.
The proximal end of 64 is fixed.

Each of the support pieces 63 and 64 includes attachment portions 63a and 64a attached to both ends of the attachment frame 137 of the light source device]0 in the orthogonal direction.
, step portions 63b, 64b extending in opposite directions from the upper ends of the mounting portions 63a, 64a, and respective step portions 63b, 6.
The support portions 63c and 64c each extend upwardly from the tip of the support portion 4b in a Y-shape. Support parts 63c, 64
Support surfaces 65 and 66 for supporting the shaft 54 are formed on c.

The support pieces 63 and 64 are formed to have a height H from the light source device 10 to the support surface 6566, and support the vicinity of both ends of the shaft 54 of the photosensitive drum 2 from below.

When attaching the light source device 10 to the frame 23, the mounting frame 137 is inserted into the opening 62 of the frame 23, and each support piece 63.6 is attached to the periphery of the opening 62 in the frame 23.
The step portions 63b and 64b of No. 4 are brought into contact and positioned. In such a light source device 1°, when the photosensitive tram unit 135 is attached to the frame 23, the shaft 54 is attached to the support pieces 63 and 64.
The photosensitive drum unit 135 supports the light source unit 136 and the photosensitive drum 2 to mutually position the light source unit 136 and the photosensitive drum 2, and the light source device 10 is pressed and fixed by the photosensitive tram unit 135.

Furthermore, this photosensitive drum unit 135 is connected to the transfer conveyance device N.
13 on the frame 23, the contact member 38.
The contact member 5859 of the photosensitive drum unit 135 is pressed downward by the contact portion 42.42a of the photosensitive drum unit 39, and with the engaging claw 2122 of the swinging member 2o engaged with the pin 24.25, the transfer conveyance device 13, the photosensitive drum unit 13, The drum unit 135 and the light source device 10 are fixed to the frame 23.

Conversely, in the electrophotographic device rI11, the registration roller 17
．． If a jam occurs in the pin 24. Release the locked state with 25.

Thereafter, the transfer conveyance device 13 is angularly displaced around the axis of the drive roller 28 of the conveyance device 27 in the direction of arrow B4. As a result, the registration roller 1718, corona discharger 5, and conveyance device 27 mounted on the housing 14 of the transfer conveyance device 113 are exposed, making it easier to clear the jam and repair and inspect the corona discharger 5 and the conveyance device 27. can be done.

Further, in this state, the contact members 58 and 59 of the photosensitive drum unit 135 are also exposed, and the photosensitive drum unit 135 can be easily taken out from the frame 23 by an operator pinching these and pulling them upward. This makes it possible to easily replace the photosensitive drum unit 135.

Further, in this state, the light source device 10 within the opening 62 of the frame 23 is exposed, and the light source device 10 can also be easily taken out by pinching the support pieces 63 and 64 and pulling them upward. In this manner, the electrophotographic apparatus 1 can easily perform repair and inspection work on each component forming the transfer conveyance device 13, the photosensitive drum unit 135, and the light source device 10.

FIG. 8 is a perspective view of the housing 14 and the conveying device 27 seen from the lower side of FIG. 5. FIG. A rotating shaft 31 is coaxially fixed to the driving roller 28 of the conveying device 27 . Both ends of the rotating shaft 31 are rotatably supported by cylindrical bearings 69 and 70 formed at both longitudinal ends of a frame 68 extending along the axial direction of the drive roller 28 . On both sides of the frame 68 in the orthogonal direction upstream of the bearing portions 69 and 70 in the sheet feeding direction B1, engaging protrusions 71 and 72 extending in directions away from each other are formed, respectively.

Furthermore, a driven roller 29 is rotatably mounted further upstream of the engaging protrusions 71 and 72 of the frame 68.

Further, as shown in FIG. 9, a locking pin 73 is provided in the driving end portion 74 of the rotating shaft 31 on the shaft 52 side, passing through it in the diametrical direction. total 15
3 to form a shaft coupling mechanism in which rotation of the shaft 52 is transmitted to the drive roller 28. Further, the cylindrical body 30 of the drive roller 28 includes the conductive plate 32, the rotating shaft 31, and the shaft 5.
2 to an external ground potential.

The driven roller 29 includes a cylindrical body 84 and a rotary shaft 85 that is rotatably mounted coaxially with the cylindrical body 84, and a portion of the rotary shaft 85 that protrudes from the cylindrical body 84 is made of synthetic material with a low coefficient of friction. Bearing pieces 86 and 87 made of resin material or the like are respectively attached.

These bearing pieces 86 and 87 are arranged in the paper feeding direction B1 of the frame 68.
It is fitted into and removed from approximately U-shaped fitting grooves 88 and 89 formed at both ends of the upstream end, respectively. Bearing piece 8
The pressing protrusions 123 and 124 of the frame 55 come into contact with the portions 6.87 that protrude from the fitting grooves 88 and 89.

On the other hand, a pair of pressing pieces 78.79 made of a metal material having spring properties are arranged near the side wall 7677 of the ceiling plate 75 of the housing 14 and spaced apart from the side wall 76.77. Each of the pressing pieces 78 and 79 includes a mounting portion 8080a that is attached to the ceiling plate 75, a pressing portion 82 that extends in a direction away from the ceiling plate 75, and has an engagement hole 81.81a formed therein.
82a, and guide portions 83, 83a that are continuous with the tips of the pressing portions 82, 82a and extend obliquely toward the side walls 76, 77.

An opening 90 extending in the orthogonal direction is formed in the ceiling plate 75 on the upstream side of the pressing pieces 78 and 79 of the housing 14 in the sheet feeding direction B1, and a hole 90 protrudes into the opening 90 and is mounted integrally with the ceiling plate 75. Piece 9192 is formed. A pair of spring pieces 93,94 are mounted on this mounting piece 91,92.

The spring pieces 93.94 have spring portions 95° 95a fixed at one end to the mounting piece 91.92 and extending into the opening 90 on the side wall 76.77 side from the mounting piece 91.92, and each spring portion 9
5.95a and integrally includes a connecting portion 96.96a extending in a direction away from the ceiling plate 75 and an abutting portion 97.97a provided at the tip thereof.

These spring pieces 93, 94 move the conveying device 27 into the housing 1.
4, the bearing pieces 86 and 87, which are attached to the driven roller 29 and pressed by the contact pieces 123 and 124, are elastically urged in the direction away from the ceiling plate 75 by the contact parts 97 and 97a, respectively. do.

The bearing pieces 86 and 87 abut against the contact pieces 123 and 124 of the photosensitive drum unit 135, and maintain a constant distance between the photosensitive drum 12 and the surface of the conveying belt 12 on the photosensitive drum 2 side.

The rotating shaft 31 of each driving roller 28 is detachably attached to bearings 49 and 50 fixed to the frame 23, and when mounted, the driving end 74 of the rotating shaft 31 of the driving roller 28 is connected to the shaft 52 as described above. power is transmitted from the shaft 52 and electrically connected.

On the other hand, in the driven roller 29, the bearing pieces 86.87 are only mounted on the pressing protrusions 123, 124, and the engaging protrusions 71.72 of the frame 68 are inserted into the engaging holes of the pressing pieces 78.79. It is fixed to the housing 14 by engaging with 81 and 81a. Since the pressing pieces 78 and 79 elastically press the frame 68 in the direction toward each other due to their own spring properties, when it is attempted to remove the conveying device 27 from the housing 14, The pressing pieces 78, 79 are pushed apart from each other to spread them, the driven roller 29 is removed from the housing 14, and the driving roller 28 is removed from the bearing 49, 50.

The corona discharger 5 is detachably mounted on the upstream side of the spring pieces 93 and 94 of the housing 14 in the paper feeding direction B1. That is, an insertion opening 111 through which the corona discharger 5 is inserted along arrow B2 is formed in the side wall 77, and an engagement recess 112 is formed in communication with the insertion opening 111. The side wall 76 is provided with a pair of clamping pieces 113 and 114 made of a material having spring properties and expanding toward the side wall 77 side. The ceiling board 75 has the insertion direction B.
A plurality of mounting holes 115 are formed, each extending along 2. A protrusion 116 protrudes inward from each mounting hole 115.
are formed respectively.

In the corona discharger 5, end members 117 and 118 made of a synthetic resin material are fixed to both ends of the shield case 15, and the discharge wire 16 is stretched across the end members 117 and 118. The end member 117 on the side wall 76 side of the housing 14 includes
A retaining protrusion 110 is formed that protrudes toward the conveying device 27 side, and an engaging protrusion 119 that fits into the engaging recess 112 of the side wall 77 along the insertion direction B2 is formed on the other end member 118. be done.

On the ceiling plate 75 side of the shield case 15, as shown in FIG.
20 is formed thereon, and a plurality of connecting pieces 121 that fit into the mounting holes 115 are formed thereon. Connecting piece 12
1 is attached to the attachment hole 115, and when the corona discharger 5 is further pressed downstream in the insertion direction B2, the end member 117
enters between the clamping pieces 113 and 114 and is clamped by these. The pressing portion 122 facing the connecting portion 120 of each connecting piece 121 presses each protrusion 116 with the connecting portion 120, thereby fixing the corona discharger 5 to the housing 14. Further, the retaining protrusion 119 is configured such that when the corona discharger 5 is inserted,
It slides while fitting into the engagement recess 112, making it easy to attach the corona discharger 5 to the housing 14.

FIG. 11 is an exploded perspective view of the conveyance device 27, and the first
2 is a cross-sectional view of the frame 68 of the conveying device 27 in FIG. 11.
It is a sectional view seen from a standing position. A shaft 138 is concentrically protruded from both ends of the cylindrical body 30 of the drive roller 28, and has a diameter D of the cylindrical body 30.
A flange plate 98,99 made of a synthetic resin material having a low coefficient of friction and having a diameter D2 larger than 1 is fixed to the bearing portion 69.70 of the frame body 68.
slides. Insertion holes 139, 140 having a diameter larger than the outer diameter of the shaft 138 are formed in the bearing portions 69, 70, into which bearing sleeves 141, 142 made of a synthetic resin material with a low coefficient of friction are fitted. Each bearing cylinder 141° 142 has a cylindrical portion 141a,
142a and flange portions 141b and 142b. Therefore, it is possible to prevent toner from getting mixed into the bearings 69, 70 and causing rotational failure. The bearing tube 141,
142 may be integrally formed with the frame 68 from a synthetic resin material with a relatively low coefficient of friction. Further, the bottom surfaces 88a and 89a of the fitting grooves 88 and 89 of the frame body 68 are formed flat, and mounting holes 100 and 101 are formed respectively.
Coil springs longer than depth 00.101 102.103
is inserted.

A through hole 104 through which the rotating shaft 85 of the driven roller 29 passes is formed in the bearing piece 86, and a coil spring 102 is formed in the bearing piece 86.
A guide pin 1°5 having a thickness to be inserted therein extends in the radial direction of the bearing piece 86 and is provided upright therein.

Rectangular plate-shaped rectangular protrusions 106 and 107 are formed on both sides of the bearing piece 86 in the axial direction with respect to the guide pin 105 . Is the bearing piece 86 fitted as described above? 1t88, the guide pin 105 is inserted into the mounting hole 1 within the coil spring 102.
00, and the rectangular protrusions 106 and 107 touch the bottom surface 8.
8a. This prevents undesirable situations in which the bearing piece 86 within the fitting 71188 rattles unnecessarily or is angularly displaced within the fitting groove 88 around its axis.

Further, the end of the bearing piece 86 on the side wall 76 side is cut off on the side opposite to the guide pin 105 to form a stepped surface 108. This stepped surface 108 corresponds to the frame 109 of the corona discharger 5 described above.
The corona discharger 5 comes into contact with the retaining protrusion 110 from the upstream side of the insertion direction B2, and when the conveyance device 27 is attached to the housing 14, the corona discharger 5 is pulled out in the opposite direction to the insertion direction B2. Preventing the situation from occurring.

In the conveyance device 27 having such a configuration, the coil spring 102
．． 103 applies tension to the conveyor belt 12 wrapped around the driving roller 28 and the driven roller 29. In addition, during use, the conveyor belt 12 is connected to the driving roller 28 and the driven roller 29
In order to prevent the drive roller from falling off, the drive roller 28 is provided with the flange plates 98 and 99. To remove the conveyor belt 12, move the driven roller 29 to the drive roller 2.
8 side against the spring force of the coil springs 102 and 103 to remove the loosened conveyor belt 12. To install a new conveyor belt 12, move the driven roller 29 to the drive roller 28.
When the conveyor belt 12 is attached while being pressed toward the side and the pressing force is released, tension is applied to the conveyor belt 12 by the coil springs 102 and 103.

In the electrophotographic apparatus 1 having the above-described configuration, the transfer conveyance device 13
The housing 14 has the engagement holes 36 of the engagement pieces 34 and 35.
, 37 are attached to the bearing 4950 of the frame 23, and are configured to be freely angularly displaceable in place of the shaft M1 of the bearing 4.9.50.

When the housing 14 is moved toward the frame 23 side, the guide surface 2 of the engaging claw 21.22 of the swinging member 20 on the frame 23 side
1a and 22a come into contact with the pins 24.25, and the swinging member 2
0 is angularly displaced in the direction of arrow A4 against the spring force of a spring (not shown), and the engaging claws 21.22 are fitted into the pins 24.25.

When removing the housing 14, move the swinging member 20 in the direction of arrow A.
Engaging claws 21.22 and pins 24.25 are angularly displaced in four directions.
Release the locked state of the housing 14 with the bearing 49,
50 in the direction of arrow A6. Thereafter, when the engagement pieces 34 and 35 are removed from the bearings 49 and 50, the transfer conveyance device W13 is removed from the housing 23.

The transfer conveyance device 13 allows the recording paper to pass between it and the guide surface 9 of the developing device W14, performs a transfer action on the recording paper between it and the photosensitive drum 2, and further transfers the recording paper after the transfer in the conveyance device 27. The receiver is the part that functions to transport paper, etc., and is the part where paper jams and various malfunctions are most likely to occur. By making such a transfer conveyance device 13 detachable from the frame 23 as described above, maintenance of the electrophotographic apparatus 1 is extremely easy and usability is improved.

The photosensitive drum 2 is fixed to the frame 23, and the housing 14 is positioned relative to the photosensitive drum 2 by the abutting members 58, 59 and 38,39. That is, the distance between the corona discharger 5 attached to the housing 14 and the photosensitive drum 2 is determined by the height Ll of the contact members 38° 39 and the height L2 of the contact members 58, 59, and the distance between the photosensitive drum 2 and the corona discharger 5 mounted on the housing 14 is determined. The belt 12 and the photosensitive drum 2 are positioned relative to each other. Thereby, even if the transfer conveyance device 13 is removably attached to the frame 23, a highly accurate electrophotographic operation can be realized.

As described with reference to FIGS. 8 to 10, the drive roller 28 and driven roller 29 of the conveyance device 27 are removable from the housing 14. When the conveyance device 27 is mounted on the housing 14, the driven roller 29, which is connected to the drive roller 28 via the frame body 68, has the mounted bearing pieces 86, 87 connected to the spring pieces 93 attached to the housing 14.
．． 94 and is spring-biased to the side opposite to the ceiling plate 75.

Further, the pressing protrusion 1 formed on the frame 55 of the photosensitive drum 2
23 and 124 are the bearing pieces 86 when the conveyance device W27 is attached.
．． 87 that protrudes from the fitting grooves 88 and 89 and presses it. Therefore, the photosensitive drum 2 and the driven roller 28 are positioned.

In addition, the engagement protrusions 71 and 72 are connected to the engagement holes 8 of the pressing pieces 78 and 79.
1 and 81a, the housing 14 can be installed without wobbling.

By unitizing the conveyance device 27 so that it can be attached and detached from the housing 14 of the transfer conveyance device 213 in this way, it is possible to easily perform the aforementioned paper jams and various maintenance operations in the transfer conveyance device 13. , the usability is further improved.

Further, in this embodiment, the corona discharger 5 is configured to be detachable from the housing 14, but in order to prevent it from undesirably falling off during maintenance etc., the bearing piece 86 is attached as described above.
．． Either of the stepped surfaces 108, 108a of the corona discharger 87 is brought into contact with the retaining protrusion 110 of the corona discharger 5. As long as the conveyance device 27 is attached to the housing 14, it is possible to prevent the corona discharger 5 from undesirably falling off.

As explained with reference to FIG. 11, the conveyor belt 12 in the conveyor device 27 can be easily replaced. As a result, even if there is a need to replace the conveyor belt 12, such as when the electrostatic attraction effect of the conveyor belt 12 on the recording paper deteriorates, an ordinary user without specialized training can easily replace it. The usability of the electrophotographic apparatus 1 is also greatly improved in that it can be used for various purposes.

The shaft 54 of the photosensitive drum 2 is supported by support pieces 63 and 64 of the light source device 10 at both ends. Therefore, a distance corresponding to the height Hl described above can be set between am of the photosensitive drum 2 and the light source device 10. That is, even if the flash drum 2 is detachable from the electrophotographic apparatus 1, the distance between the axis of the photosensitive drum 2 and the light source device 10 when mounted can be set to a predetermined distance. That is, the light from the light source device 10 can always form a focused optical image on the photosensitive drum 2.

Effects of the Invention As described above, according to the present invention, by releasing the supporting state of at least one of the supporting means when carrying out repair and inspection of the carrying device, the carrying device can be easily released from the housing, and the carrying device can be easily released from the housing during the repair and inspection. Work can be done easily.

Further, the conveyance device includes a pair of support rollers, an endless conveyance belt wound around these rollers, and a frame between the support opening and the support opening. At this time, one side support roller of the pair of support rollers is rotatably supported by the housing by one support means, and the other side support roller is supported by an engagement piece provided on the frame and the other side provided on the howling. When the engagement state with the support means is released, it is released from the housing. In the case of the conveyance device having such a configuration example, the above-mentioned repair and inspection work can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electrophotographic apparatus 1 according to an embodiment of the present invention;
FIG. 2 is a plan view of the electrophotographic device 1, FIG. 3 is a front view of the electronic harp/insoument N1 with the side wall 43 of the frame 23 removed, FIG. 4 is a perspective view of FIG. 3, and FIG. An exploded perspective view of the electrophotographic apparatus 1, FIG. 6 shows the registration rollers 17,
7 is an enlarged perspective view of the vicinity of registration rollers 17 and 18, and FIG. 8 is a perspective view of the transfer conveyance device 13 seen from below in FIG. 5. 9 is an enlarged perspective view of the vicinity of the drive end 74 of the rotating shaft 31, FIG. 10 is a perspective view of the corona discharger 5 seen from above, and FIG.
1 is an exploded perspective view of the conveying device 27, and FIG. 12 is a cross-sectional view taken along the cut plane line of FIG. 11 from above. 1... Electrophotographic device, 2... Photosensitive drum, 5...
Corona discharger, 10... Light source device, 12... Conveyance belt, 13 Transfer conveyance device, 14... Housing, 20. Swinging member, 23 Frame, 24.25 Bin, 27
Conveyance device, 28... drive roller, 29... driven roller,
31 Rotating shaft, 38.39...Abutting member, 49.50
Bearing, 54... Shaft, 55 Frame, 56... Housing, 58.59... Contact member, 63.64 Support piece, 68
・Frame body, 78.79・Press piece, 85・Rotation shaft, 86.
87...Bearing piece, 98.99...Flange plate, 10
2,103...Coil spring agent Patent attorney Number of strokes
Figure 1 of Keiichi Section Figure 1

Claims (2)

[Claims] (1) Stored inside the machine and transfers the developer image onto recording paper;
In an electrophotographic apparatus including a transfer conveyance device that conveys recording paper after transfer, the transfer device and the recording paper conveyance device are installed in a housing provided in the transfer conveyance device, and the conveyance device is configured to convey the recording paper. The transport device is supported by the housing near the upstream end and the downstream end in the direction, respectively, by a pair of support means, and at least one of the support means is configured to be able to release the support state of the conveyance device from the housing. An electrophotographic apparatus, wherein the conveying device is released from the housing by releasing the support means on at least one side. (2) The conveyance device includes a pair of support rollers, an endless conveyance belt made of a dielectric material wound between each support roller, and disposed between each support roller, and each support roller is rotatably attached. The support roller on one side of the pair of support rollers is rotated by one support means near one end of the housing on the upstream side or the downstream side in the conveying direction of the recording paper. Supported with free movement,
The electronic photograph according to claim 1, characterized in that the frame body is provided with an engaging piece protruding from the other supporting means provided on the housing so as to be able to engage with/disengage from the other supporting means. Device.