JPS5960449A - Electrophotographic process unit - Google Patents

Abstract

PURPOSE:To prevent the deterioration of a photoreceptor by covering a photosensitive drum with a light shielding member in the stage of drawing out a process unit. CONSTITUTION:A process unit contg. a developing device 5, a cleaner 14 and a photosensitive drum 3 is slid on rails 18a, 18b and is drawn from the body of a copying machine to permit inspection and replacement. When external light is irradiated on the photosensitive surface of the drum 3, the photoreceptor deteriorates and therefore, openings A, C for exposure and an opening B for transferring of the process unit are covered with a light shielding material. When the engaging members 27, 36 on the process unit side engage with the detaining members 33, 39, 40 provided to the body of the copying machine, a cover 26 of the photosensitive drum displaces so as to cover the opening B, a window cover 36 so as to cover the opening C and a rotary cover 34 so as to cover the opening A. The member 27 and the cover 26 are connected by means of ropes 31, 32 via a pulley.

Description

[Detailed description of the invention]

The present invention relates to a photographic processing unit. Here, the Kameko photo process unit and H,,'Tji,
An electrophotographic photoreceptor and a few other items are placed in a frame that can be removed from a predetermined position fiffi in the main body of the secondary photographic device. C〈One process means accommodation 1-tax >-s
5゜so

[The process means are a charger that is applied to the photoconductor, and a static T+L latent image development II! cleaning device, cleaning device, etc. for removing toner remaining on the photoreceptor, image (step formation 70)
This is one of the methods for applying a predetermined process JI4 to a photoreceptor in order to perform a sesquiescence process, and what is Gunko Photoso's fθ body? The above-mentioned process means (%) contain means for housing and supporting, transfer paper conveying means, fixing means for fixing the first toner image transferred from the photoreceptor onto the transfer paper, etc., and are surrounded by an exterior plate. To tell. Now, in the case of ``Ruco Photography System'', it is necessary to maintain the developer of the photoconductor as a carrier, dispose of the waste toner that has been cleaned from the transfer body, and clean the FF electric wire. ,
Depending on the need for replacement of various consumable parts or adjustment tubes, there is a membership fee for doing so.Most of the above work was concentrated around the photoconductor and was traditionally time-consuming, but in recent years, photoconductor and the developing device, cleaner, charger, etc. σ) The process means around the photoreceptor are housed in one frame. This unit is pulled out from the same position as the main body of the device II
Install the unit for each frame into the J function (; 4, or 1, remove it from the main body and install the 1 function V (;q form 17,
The following features are proposed: 1. A photographic device operator has been proposed to make each of the above tasks easier to perform. ing. In this way, the work efficiency is improved, the work time can be shortened, and the running cost is reduced by 1U.
7.C, and it is also possible to do it by the serviceman's own hands.Also, it becomes possible to fade the developing device to the same color as that of other colors. In addition, image forming means such as a photoreceptor, a developer, a cleaner, and a charger are integrated into the frame in a W-like manner. By configuring the process unit and replacing the entire unit when replacing the body, it is possible to reduce maintenance work. With such a configuration, the user especially Periodic maintenance required 1 (for each unit of process 144M)
Since it can be simply replaced and the maintenance work required by Lipisman can be removed or reduced by 1f, work efficiency is greatly improved. 'Also. Toner storage for other colors (also, by replacing the process unit, it is possible to create a single image of the desired color)
Alternatively, there are advantages such as being able to be used interchangeably with a process unit incorporating another developing device, such as the ability to use a developing device that is similar to the original image.On the other hand, these electronic During photo mounting, during maintenance work or replacement of the process unit, the photoreceptor must be removed from a predetermined position within the main body of the electrophotographic system +W.V-
Therefore, there is a risk that the photoreceptor may be exposed to external light. Such exposure of the photoreceptor to external light affects the performance of the photoreceptor and accelerates the deterioration of the photoreceptor. This V is inconvenient when using organic photoconductors, zinc oxide, selenone, or other forest materials that are susceptible to deterioration due to strong light as photoreceptors. If you use it for a long time (・also σ), you will need to be very careful because 7:C (1) is used.On the other hand, in the process unit mentioned above,
・In order to form an image (σ), an opening or aperture is formed in the frame to irradiate the photoreceptor with light.1. C, for example, to allow image light to pass through, or to remove static electricity from the photoreceptor 1. It is an opening for allowing light to pass through for purposes such as recovering from fatigue. As mentioned above, when the device is removed from the predetermined position σ) in the main body of the unit, or when replaced, external light is exposed to the photoreceptor through the 11+14zσ) opening. It causes inconvenience and ends with 5. The present invention has been made in view of the following circumstances. The present invention will be described in detail below with reference to the drawings. First, an electrophotographic copying machine using an embodiment of the process unit σ according to the present invention will be explained. 6 FIG. In the figure, (S, 14: 2 from a transparent member such as glass) Dx draft is placed, K is a double movement slide. It is an imaging optical system that includes a large number of small diameter imaging elements such as lenses, etc., and is fixed to the first plate 16 inside the main body X. The first original Y placed on the table is irradiated by the first lamp L, and the reflected light image is this one.
The photosensitive drum 3 is subjected to slit exposure through the opening A formed in the frame of the unit 170. Note that this exposure 1° \3 is 'J
lh Rotate in the direction of the arrow around 311. 4 is a charger, for example, a zinc oxide photosensitive layer or an organic photoconductor photosensitive layer 3a, etc. is covered with the first photosensitive drum 3. ] The first drum 3, which has been uniformly charged by the device 4, is subjected to image exposure of the reflected light image by the element 2, so that the static image and the latent 1 image form the shape li.
d first. reactor. This Shizuka submarine fjJ! is first visualized by a developing device 5 consisting of a magnet rt-ra 5a and a toner reservoir 5b. On the other hand, the sheet P on the transfer paper storage box S (which can be attached to and detached from the main body 0, 10
The information will be sent to the FIC transcription department. At step 1-, the toner image on the photosensitive drum 3 is transferred onto the sheet P by the transfer discharger 8. After that, the driver is separated by a separation mechanism 9 (for example, a separation belt or a separation corona discharger).
The first sheet P separated from the first sheet P is guided to the fixing device 11 by the guide 10'', and after the toner image on the sheet Δ-hiσ is fixed, the first sheet P is discharged onto the tray 13 by the discharge roller 12. In addition, guide 10.10', 10'', rollers 6, 7, 12
゜Transfer discharger 811 molecular stage 9. The fixing device 11 is fixedly supported in the main body ) After the toner image is transferred,
The residual toner on the drum 3 is removed by a cleaner 4. This cleaner 14 includes a blade 141 that is in contact with the drum 3, a waste toner reservoir 141), and a blade 141 that is in contact with the drum 3.
A scooping sheet 14Q is used to catch the waste toner removed from the surface of the drum 30 by a filter. Drum 3 is
After this, the residual charge on the top and surface of the housing 1 is removed through an opening provided in the reflective shade 15 to reflect the light emitted from the lamp L onto the document Y. First thing. (
Like this 1. (Exposure before photosensitive charging by the charger 4 is called pre-exposure.) On the other hand, before the document table starts moving forward and during the backward movement, the charger 4 applies an elbow rest to the non-image area on the drum 3.]
When the load was removed, the load was exposed to light (blank exposure) through the lamp Q and removed from the first filter. Next, the configuration of one embodiment of the process unit according to the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, and 6. This process unit) U is mainly used for the frame 17 (in order to prevent light exposure to the photoconductor, whether it is made of opaque synthetic resin or metal, the drum is housed in the frame 17). 3. Charger 4%, imager 5, cleaner] 4. In addition, unit U and other process means 1, if necessary, for example, a separate corona. It may be placed between the discharger 9 and the cleaner 14, and may include a corona discharger, etc. for filtration and static elimination (it may also include a 5° drum and at least one other process means). The configuration of the shunting frame 17 will be explained based on FIGS. 1 and 4. FIG. 4 is a perspective view of the frame 17 with each process means removed. Side plate 17aS
The first side plate 17b, which is fixed to the side plate 17b, and the first side plate 17b, is mutually fixed to the side plate 17b. A right stay 17 and a left stay 17d form a box-like structure, and a charger support plate 19 (described later) covers the upper left side, and a developer cover 20 covers the upper right side. On the outside of the right stay 170 and on the outside of the left stay 17d are the upper first
Each guide member 17e. 17f are fixed, and these guide members 17e. 17f is fixed in the copying machine main body and other process means are operated to position and support the first . reactor. And when you take it out of the copier body, which is a single process unit. Open 15 the exterior plate Z' (front door) of the main body in direction b (Fig. 2), and open the plate 17 provided on the front side plate 17a.
? IR coffin, guided in the direction of the arrow, part +: 4'18a. 1) Just pull it out under the guidance of unit) U & when installing it in the specified position inside the main body. Do the opposite of the above. FIG. 2 shows the state in which the process unit is attached to and detached from the main body of the copying machine during the first filtering process. , (In this figure, it is easy to see that they are in a detached state (1), the frame 17 is excluded, and the drum 3, charger 4, developer 5, cleaner J4θ) are all shown (6) unit) inside the main body of U. When the installation in the positive position is completed, the front door Z
"% - Lift up in the opposite direction as shown by the arrow [and close.] Next, we will explain how to attach the 7-1 to the frame 17 of each process means in the wooden embodiment. First, attach the band 1% unit 4. The method will be explained based on Figures 1 and 3). Figure 3 (
``In the wood cover unit 2, remove the front plate J7a and remove 12, and check the installation status of each 1 piece forming piece.
It is something. In this figure, the first positioning and holding member indicated by a two-dot chain line is a member installed on the front side plate 17a. 1. 'c: to, kobi) The first member, indicated by the two-point chain, can be held lightly. Under this configuration;)
7. The first plate member 19 (made of gold, opaque synthetic resin, etc., is used to prevent external light from being exposed to the photoreceptor) forming the upper part of the frame body. The leg portion 4al installed on the shield plate 4a is slidably aligned with the guide 20 and positioned at 11. Charger 4
When taking out the unit), by pulling the charger 4 towards the frame 170 taking out (one direction 1) (Fig. 4), the legs 4a+ are pushed into the guide 20 and pulled out. . Next, the method for interviewing unit U on drum 3 will be explained based on figures C4, 8'3, 4, 5 and 6. Here, FIG. 5 shows the opening part A for exposure (explanation including the drive l, 3 when each of the light shielding means 1 and 1 is closed), and FIG. This is a drawing showing the means for blocking the image exposure and blank dust light from the central axis cross section of Drano. A first flange 3a is provided on both end surfaces of the drum 3 in the central axis direction. 31) is press-fitted and fixed in the first position. ! , flange 3a. A drum 6''1 positioning shafts 3al, 3b are fixed to the drum 6''1, and bearings 3a, 3b are fitted into the outer periphery of the positioning shafts 3a, 3b. 3a, 3blK, 5 positioning shafts 3a, 3b are rotatably supported (FIGS. 5 and 6), while the front plate 17 of the frame 17
a, rear side plate 17bll! - CEF 1 and 2t U-shaped grooves 17at, I7b, are formed, and these grooves 17a, 17L1. bearing 3at v 3
By dropping b* and supporting the drum 3, the drum 3 as a whole is supported in the frame 17 (Fig. 3.4). A drum presser foot 1111 ] 9a, ] 91) is provided, and the tip of this leg is made of an elastic material such as a gono, and 1.
7. Upper jtl-: Fit into the grooves 17af and 17ht. The bearings aat, 3b, fx that press the drum presser 4'4' 19a+1]9t)t are fixed on the first side, and the drum presser legs 19a, 191) are fixed on the drum presser legs 19a, 191).
*t19b, is provided, and this fixed 11'l']
9a2.19b, The receivers formed on the front and rear side plates 17F and 17b of the fj frame are fixed at the portions 17a*117')* with stators such as screws IR, 19F1st19b*,
The plate member 19 constitutes the frame 17 as a whole. (3rd.
4, 5.6). Due to this. The drum 3 is a drum holding member 19Fl+, 19bt
2). /
[The flange 3b is formed with a gear portion, and the drum 3 is rotated by connecting this gear portion to a drive source (not shown) provided on the main body of the copying machine. Further, this gear portion transmits the driving force to the magnet roller 5a of the developing device 5 in the process unit. Also, plate-shaped members]
To 9 (fulcrum part) 9a4.1911. (19114
(not shown) is formed by the fulcrum part 19841.
19134G''j Outside frame 14 d of cleaner 14 (il
The shafts 14d, , 14dt (14(1, &
! (not shown) Pc, SoJL-t'OL engagement,
'Ci b. As shown in Figures 3 and 5, the axes 14d, , I
The fulcrum part 19a4+l9b has a two-sided grooved shape with an opening that fits into the attachment/detachment. In the assembled state, the shape that allows rotation about the shaft 14 (II, 14dt) can be removed, or when the drum is replaced, it can be removed from the frame 17 in the direction of arrow 1. d+, l 4 d
rotation around t]1 is possible. Either the removal in the direction of arrow E or the rotation in the direction of arrow F, the plate member 19Tt! , the drum 3 is retracted from above, so the drum 3 can be taken out from the frame 17 in the direction of arrow E and replaced 1+J'. Next, the method of attaching the developing unit 5 to the unit U will be explained based on Figure 3.4.5. a, axes J7a, 17b3 and 17a” provided at positions facing the rear i11.ll plate 17b;
By removably mounting the first stone 1a on 171.14, a predetermined gap σ) is formed between the first stone 16 positioned in the frame 17 and the photoreceptor 3. reactor. Also frame 5C
There are axes 5Cz5Cz, p, jl, (5C
1tAlthough not shown, the shaft 5q is located at an opposing position ji' (Ic and tl) in the direction of the drum center axis. - On the male front side plate 17a and the rear side plate 17b, shafts 17aH171) are placed at positions facing each other! and [1'llll 17a,
, 17b@i+"zsetarat,'11111
7ae+17b, Lenoku-17a, , 17b were installed so that they could rotate around the human body. It's okay. So

[,te l/ /(-17as, Bb, and axis 17at
, 17') and e respectively.
@ Part 1. te(・ro. Therefore, this spring 17a
Due to the tension of o, 17')s, Reno (-17rl tortoise.]7b, presses shaft 5 and 1+502, developing device 5tj
Be sure to hold it in the frame 17. Amada developing device 5 tr) A fulcrum portion 19as formed by an upwardly curved plate-like member 191C. 19b,? Turn 8I!'I in the direction of the arrow (l) in the center and 17
J-capable cover 21 is provided 1. It's cool (-2
1! One end rests on the shaft t71 provided on the rear side plate 171) and falls toward the phenomenon device 5.1. (This is how the developing device 5 and its surrounding parts are configured.) The cover 21 is rotated and retracted in the direction of the arrow G, and the flange 17b is 17"%. The frame 17 can also be taken out in the direction of the arrow I. Next, install the cleaner unit U-\ of the cleaner 14. The method is shown in Figures 3 and 4. Cleaner frame 14d
On both sides in the drum center axis direction, there are shafts 14ds + 14d4, 14ds + 14d,
are formed (the axes 14d4 + l4ds are not shown), and these axes form the front plate 17a of the frame 17. Rear 1111 plate 17bK installed groove 17 RIQ
The blade 14a is placed in the attaching/detachable position at +I 7b+*, so that the blade 14a is brought into contact with the drum 3 and positioned at the 5th position. There are shafts 14a and 14d on both sides of the cleaned cleaner frame 14d.
8 (14da is not shown) are formed at opposing positions, one side plate 17a, 17b Vl is the shaft 17 all
+ 171)++ (17bll 'tl not shown)
4111117 al,
. 171) l/% capable of rotating nJ around u] 7
Flltl 17 b,. is installed. Reno' 17i1+t, 1
VC between 7b+t and grooves 17a+o, 171)+o,
The springs 17a, . . . , 17111g (17bts not shown) are attached to the first piece. 0 mouths. This σ〕r'' 17a...
, 17b+, due to the tension 6 +/A -178+* 1
17t) n is the shaft 14dy + 14"s of the cleaner, and the IJ-su 14 is securely held in the frame 17,
reactor. Maroku: Cleaner 14 is -11 in the case of developer 5 mentioned above.
to ie. Lever 17 Rat 117b+t 'l' arrow Jσ)
By avoiding the direction 11ul lJ+1, iJ, you can take out one frame 17 in the direction of the arrow σ). kl) to the process unit! A transfer aperture B is formed in the transfer section where the transfer discharger 8 faces the light apertures A and C and the drum. The entry of external light through the opening h'' - Photosensitivity 11 - \ causes a bad shadow.Therefore, the first step is to close the maggot opening if'i.
7'+-BrJ-1! Suyu::tsu]・112. Sumi and l↓Roga1,7-σ)l)11. ldoIshishi1(l
From ¥6j onwards - F Nori 11' (〆]ゝ沙きさお], 7)
.ヰzu, t:iQ 1. 14 is the blockage point 14, when the professional knee knit is removed from the body of the machine, and when it is removed from the machine, it is placed in the block 14.
La l (I. Kon)'! , l11gUY two bodies・\σ
) Evening 1 Heat 'r, feeling of influence) The 4th body is in agony (especially the roughness of the 1st stone time) 1. It must be done reliably/, C. Opening and closing of [1 fM, ili! + I hope it's a work] It's because it's a lot of things, and I'm going to have a good time with ffi. (↑, 1'1) As a matter of upbringing & talent, it is the sergeant who is to be disposed of as much as possible to make it 1st and 5th. Consideration 1. Tenasao], Tamoσ
) to explain the light-shielding mechanism that closes the exposure aperture (4-).
The transfer phase is open when the transfer phase is open.
-(: c・ru place Nt, deciding part?t 1sa, ]
8-b is also indicated by a two-dot chain line (there is a hair). FIG. The state in FIG. 9 shows the position of the light shielding mechanism when the opening B is open, and the front plate 17a side of the frame body is indicated by a two-dot chain line (-).On the other hand, as shown in FIG. The state of the light-shielding mechanism (L-r shows the state in which the opening B is closed).On the outer surface of the front plate 17a and the rear plate 17I of the frame 17, there are shafts 1 at opposing positions.
7a14+ 17b+i- and 17a, l. 17b+s is formed with the first shaft 17a, 4 and ttlz
The levers 22 and 23 are rotatably attached to the levers 22 and 23.The levers 22 and 23 have shafts 22., 23. fixed at 1"C, and these shafts 221.23. A spring 24°25 is installed between the shafts 17aH@, 17b+w.The holes 22□23 provided in the levers 22 and 23 are made of opaque synthetic resin, metal, etc., and are made of a photoreceptor. Pins 26. and 26. protruding from the cover 26, which can block external light, are loosely fitted together.
6s? 264 pins are fixed, and 268 pins are fixed.
．． 26. Arc-shaped groove 17a+m11 that guides the slider
7b and ^ are formed in the front 1m plate 17a and rear (rule i 17b) of the V-frame J7.On the other hand, a guide groove 17d is formed in the left stay 17d of the frame 17. Bd,
A slidable slide member 27 is installed therein. Also, left stay 17d and shaft 17dt. 17rl, , 17d4 are fixed and rotatable around the first pulley 28.29.30
is installed 7:, and one end of a wire 31 is fixed to one end of the cover 26, and this wire 3I is connected to the pulley 3.
The other end is fixed to the slide member 27 via 0. One end of a wire 32 is fixed to the other end of the cover 26, and the other end of this wire is fixed to the slide member 27 via pulleys 28 and 29'. Behind the left stay 17d in Fig. 1f and 259, there is a member shown by a two-dot chain line.
3, the first one is configured as shown below. Transfer opening I
The light-shielding mechanism of step 3 operates as follows. First, 3rd and 9th
In the state where the unit shown in the figure C-Iroyo 5 is positioned at a predetermined position in the main body of the copying machine, the cover 2
Reference numeral 6 indicates that the levers 22 and 23 are being moved in the direction of the arrow N by the springs 24 and 25, but the slide member 27 is in contact with the locking member 33, so that the groove 17d1 is 1. Since the cover 26 is prevented from moving, the cover 26 is in a position retracted from the transfer section opening B.
remains in the first open position, and the process unit abuts against the locking member 33 in the guide groove 17d. As the member 27 moves, the cover 26 is pulled by the spring 24.25 and moves in the direction of the arrow N (Fig. 3), so that the slide member 27 moves toward the end 17dll of the guide groove 17d.
When the first point is reached, the point shown by the two-dot chain line (26) in FIG.
Completely close the opening 13!・At this time, external light is exposed to the photoreceptor.1. ff1Hc is reached to the extent that it is prevented from occurring. This r&process unit U is further pulled out in the direction of the arrow and taken out from the main body of the copying machine. cover 26
Also prevents damage to the aperture B through (ty) photoreceptor σ). Insert unit U into the copying machine body [7. 1+: y vj to set in the predetermined position ji4, ``2
7 is still in contact with 33 -C groove 17cl, by moving 4 in the middle M and M direction, the cover 26 moves in the opposite direction vr to N, and moves g'! + L. Unit (・ is inside the main body Set it in a predetermined position 7 (with the surface side opening 10 open 2).Next, explain about the light shielding device f1q of the exposure dose (1A.゜5
(Using Figure 3H7 to block the open IJA, the machine t
1. I will explain about. 5, as is clear from the explanation of the process of forming both stools on the main body of the copying machine at the beginning and from FIG. [2] The first plate-like member 1 shown in Fig. 15 and 7 is
9 (image exposure) Y: and rung Q are open ITI A for performing blank exposure. A fulcrum portion 198s HI 91)a is formed in the folded plate-like portion Uxq, and these fulcrum portions have shafts 19a, , ] 9
1) y is fixed and remains the first. and river 119 ay,
J 91-+, with K' as the center of the horizontal axis, the opening A can be rotated to open and close.
A cover 34 (made of opaque synthetic resin, metal, etc.) is installed. In the dark state shown in FIGS. 3 and 5, the cover 34 is in contact with the top surface of the plate-like member 19 and is not opened [1A]. , C is in the state. Now, the process unit U performs tasks such as replacing the developing device and replacing the drum.
In the opposite direction (1)') - \, 1 [i.e., inside the copying machine main body \\ When inserted (Fig. 6), the sloped portion 341h'' formed at the end of the cover 34 - H ~ Ride on the oblique part of the guide member 35 fixed to the main body of the beach.Then, the process unit is further inserted, and the inclined part 34 is guided to the guide member 35. As a whole, the axis 9a?
In this way, the user rides on the guide member 35 with his or her mouth completely open and comes to rest. In this state, the optical system 2
It is possible to perform horizontal image exposure and 4 blank lights using lamp Q.
[It is. When the process unit is removed from the direct copying machine main body, the operation of the cover 34 is the reverse of the above operation, and the inclined portion 34. fJ'' - from guide member 35 to orchid 1
When the cover 34 is turned by gravity, it returns to the first state shown in FIGS.
A is Units) Before removing from the UY main body, make sure that the letter is completely
It's Rono. This prevents the drum 3 from being exposed to external light, and also prevents damage to the drum from exposure to outside light. Note that the cover 34 may be biased to rotate in the S direction by a spring. Next, the structure of the light shielding function in the open c+ CK will be explained based on Figures 1 and 3°5.8. Plate-shaped member 19'' - blind cover 36 (first layer made of opaque synthetic resin, metal, etc.)
is slidably placed in the elongated hole 36. of this cover 36.
, 36. There is a guide bin I provided in the plate-like portion 4]19.
9a, l I 9t)s is loosely fitted in the first place. Therefore, the cover 36 can be slid in the direction of arrow 0 in FIG. 8 to open and close it. Further, the cover 36 and the first plate provided on the plate-like member 19. Between the tabanekage I 9ao H] 91)e, the spring 37.38 is applied once and the cover 36 is moved; il-1
Biased in the C closed direction [Stay at 7. In this way, 1.
In this state, the cover 36 is in the plate-like portion 14' 19 vC. 1. Close the opened opening C to prevent further exposure to the photoreceptor. It is in a state of being Similarly to the above-mentioned opening B, when the process unit is moved in the direction of insertion (1)' into the main body, the cover 36 The inclined portion 36. formed at the end of the copying machine is guided by guide members 39, 40 (Figs. 1 and 8) fixed to the main body of the copying machine, and as shown in Fig. 8, the inclined portion 36. The position (double-dot chain line) where the opening Ct was opened is moved to the opening position IVI where the opening C is opened, and the process unit is moved to the predetermined position in the copying machine main body.
\When the crotch is closed, it is completely open [JC is at rest in the open state (to the solid line, and in this state, the photoconductor can be pre-exposed. Note that Fig. 1 shows the opening 1 "C" is shown in the open state.The operation of the cover 36 when the process unit is taken out from the copying machine main body. ″−
PU Jido shoes (+1'39?">R', Ot, 721 temple, Kak(-369-1, t": Ne 37.38). 1.Return to the original state and remove the unit)U from the main unit.Open LI to 4611.
CIJ' - Completely closed 1st. The drum 3 is exposed to external light (6), and the depth (1°) is 7. c <, and damage to the drum σ due to the opening C being passed through is also prevented. In the above actual example, the light shield + *) work, first the 6 obi, the plate-shaped part tAK that holds the vessel, and the σ) installed against the plate-like part tAK that holds the vessel, and this member is , since it has both the functions of fixing the drum (it also has a part of the light-shielding function), it has the effect of making it multi-functional. It's a big deal.There is a risk of malfunction due to the shading device and the fact that it is simple. Since it can be configured into a small, light mouse, handling of the unit is easy. In addition, copies are made while being pulled out from a predetermined position inside the copying machine body (there are some types that can be held outside the copying machine body).The first is the internal material 17e on the process unit side that was exposed to acid in this practical example. ,
17f and positioning on the copying machine main body side y) Members 18a, 1
8b k part + t] 8a, ] sb The unit drawer is engaged with a stopper at the side end so that it cannot be removed from the process unit 'x' PM 4 machine body. Therefore, there is essentially no difference between such a process unit and the process unit shown in the actual example, which can be removed as a unit from the main body, and the light shielding mechanism can be easily applied. FIG. 10 shows another embodiment of the present invention, in which the photoreceptor and process means are
Although it is removable, it is a cartridge type process unit in which the photoreceptor and each processing means are integrally constructed. When using the unit containing the developer, the entire unit is replaced and installed in the main body of the copying machine. Charger 4
．． Current status 5. The cleaner I4 is integrally inserted into the mold frame 17' at 17. Even in such a cartridge type unit, the exposure opening A, C1 and the transfer opening 1] are opened, and when the unit is removed from the copying machine body or before it is installed in the copying machine body, the above-mentioned implementation is still possible. I think the same treatment is required. The light shielding mechanism for closing the transfer opening B in this example is the same as that in the sister example described above. On the other hand, the light-shielding mechanism for closing the image exposure openings A and C is also the same mechanism as in the previous example, but in this example it is installed in a frame 17' integrally formed with a mold. Since the light shielding effect of this embodiment is the same as that of the previous embodiment, a description of the operation and effect will be omitted. In addition, in the embodiment, both a slide type cover and a rotation type cover were used to close the exposure opening, but depending on the sergeant, one or the other type may be used. Of course. The material of the cut cover may be an elastic material such as metal, resin, or rubber, but it goes without saying that it may be made of an opaque material or a non-transparent material. Of course, it is also possible to use a filter material that blocks light of a wavelength that gives a 100% off, or a member that attenuates external light to a level that does not adversely affect the photoreceptor. For convenience, such a filter material light-attenuating member will also be referred to as a light shielding member.The present invention is applicable not only to ordinary copying machines, but also to a method of exposing a Kameko photographic photoreceptor to light using a laser beam or a light emitting diode array in response to an electrical signal. It can also be applied to an electrophotographic apparatus.In addition to the process unit shown in this example, there is one shown in FIG. The opening is closed when the unit is taken out from a predetermined position inside the main body of the copying machine. Fig. 11 (N is the system example shown in Fig. 11 with a lens 2 for condensation ''f added, and (B) is the lens 2 and separation means. (separation bell)) 46V added, (C) is the charger cleaner excluded, (IJ is the charger and developer excluded, (Noke cleaner excluded), (1-load developer excluded) In addition to this, it is conceivable to install a corona discharger for static elimination under the glass, but in any case, the unit consists of a photosensitive drum and at least other components. The type 1. containing one process means is good, and a cartridge type like the one shown in Fig. 11 may also be used. Since it is linked to the attachment/detachment operation of the process unit, light shielding is performed automatically, and it is possible to avoid forgetting to do so when manually shielding the light. Since the photoreceptor (drum) is exposed to outside light for a very short time, the photoreceptor (drum) is completely protected from the effects of outside light.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a copying machine using one example of the process unit according to the present invention, and Fig. 2 shows the frame of the process unit when the process unit is pulled out from the copying machine main body. Compositional explanation drawing, @
Figure 5 + 6 + 7 + 8 is a diagram explaining the eye mechanism of the exposure aperture, and Figure 9 is a diagram explaining the light shielding mechanism of the transfer aperture. FIG. 10 is a diagram illustrating an actual example of a cartridge type process unit according to the present invention, and FIGS. This is a drawing. Un process unit, X is the electrophotographic apparatus main body, A, C
1 is an exposure aperture, B is a transfer aperture, 3 is an electrophotographic photosensitive drum, 4 is a charger, 5 is a developer, and 14 is a cleaner. 26
, 34.36 is the cover. 3Z Utah (Sun) (C)

Claims (1)

[Claims] (1) An electrophotographic photoreceptor and at least one other process means are housed in a frame that is removably attached to a predetermined position in the main body of the electrophotographic apparatus. When installed in the predetermined position,
The housing is retracted from the closed position 14 to the open position by engaging with a working member provided in the main body, and when removed from the predetermined position of the process unit, the locking with the working member is released and the housing is opened. The electrophotographic process unit according to claim 1, which moves from the position to the closed position.