JPH0138608Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electrophotographic copying apparatus in which a photoreceptor belt is assembled into a case to form a cartridge.

Conventionally, as shown in FIG. 1, a photoreceptor belt made into a cartridge simply incorporates a photoreceptor belt 3 wound around a driving roller 1 and a driven roller 2 inside a case. A case with a peripheral wall corresponding to the length of the body belt was required. This increases the size of the case, making it difficult to downsize the device itself and making it difficult to replace the photoreceptor belt.

The object of this invention is to provide an electrophotographic copying apparatus that can eliminate the above-mentioned drawbacks.

Examples of this invention will be described below based on the drawings.

FIG. 2 shows an electrophotographic copying apparatus according to an embodiment of this invention. In the figure, 11 is a glass on which an original is placed, 12 is an illumination unit, 13 is a reflection unit, 14 is an optical unit, and M is an optical unit. mirror, 1
5 is a belt photoreceptor unit, 16 is a charging charger, 17 is a developing unit, 18 is a transfer charger, 19 is a paper feeding unit, and 20 is a fixing unit.

As shown in FIGS. 3 and 4, the case 21 of the photoreceptor belt unit 15 has a charging window 22 on the upper surface of its peripheral wall, a developing window 23 on the front surface, and a transfer window 24 from the rear to the rear surface of the lower surface. is formed, and a cleaning unit 25 is provided inside.

The cleaning unit 25 has, for example, a toner bottle 26 integrally formed with the case 21, a cleaning blade 27 at one end, and a central portion supported by a shaft, and the other end and the toner bottle are connected by a spring 28. Part 2
It is composed of 9th magnitude.

Furthermore, inside this case 21, as shown in FIG.
4, 35, 36, and 37, respectively, guide members 38, 39 are provided at predetermined intervals from the upper and lower surfaces of the case 21, respectively, and a guide member 40 is provided between the guide rollers 35 and 36. It is provided. The photoreceptor belt 41 then passes from the guide roller 33, between the guide member 38 and the upper surface, around the drive roller 30, between the guide member 39 and the lower surface, around the take-up roller 31, and further on. From the winding roller 31 to the guide roller 34, then to the guide roller 35 and the guide member 40.
and a guide roller 36, and is wound around the guide roller 33 via a guide roller 37. Also, both sides of the photoreceptor belt 41 have earth bars 4.
It is grounded by 2.

Further, in order to load this case 21 into the main body of the apparatus, a guide claw 43 is provided on the upper surface of the case 21, and a protrusion 45 having a screw hole 44 for removably fixing the case 21 is provided on the front surface. and the rear surface (not shown), respectively.

To load the photoreceptor belt unit 15 into the main body of the apparatus, for example, as shown in FIG. The guide claw 43 of the case 21 is engaged with the rail 48 and inserted in the direction of arrow B, and the protrusion 45 is removably screwed into a screw hole 49 provided in the side plate 46. If the upper unit is of the open type, for example, as shown in FIG. It is removably screwed by a member 52.

Further, when the photoreceptor belt unit 15 is loaded into the main body of the apparatus, the charging charger 16 and the developing unit 1 provided in the main body of the apparatus as shown in FIG.
7. A charging window 22, a developing window 23, and a transfer window 24 formed in the case 21 correspond to the transfer charger 18, respectively.

Further, the drive roller 30 is configured such that, by this loading, a gear 53 attached thereto meshes with a drive gear 54 and rotates, as shown in FIG. 7, for example.

Next, the operation of the above will be explained.

After loading the photoreceptor belt unit 15, press the start button (not shown), and the photoreceptor belt 4 will start.
1 begins to move while its surface is charged by the charger 16. Almost at the same time as this movement, the illumination unit 12 starts scanning in the direction of arrow A, and at the same time, the reflection unit 12 moves in the direction of arrow A, forming an original image on the photoreceptor belt 41 moving through the developing window 23. A corresponding electrostatic latent image is formed, and this electrostatic latent image is visualized by the developing unit 17. The photoreceptor belt 41 further moves, and the visualized image is transferred onto a copy sheet by the transfer charger 18, and the transferred copy sheet is fixed by the fixing unit 20 and discharged. After the transfer, the photoreceptor belt 41 passes around the take-up roller 31 and passes through the guide rollers 35 and the guide member 4.
0 and the guide rollers 36, and further passes through the guide rollers 37 to the cleaning unit 2.
It is cleaned in step 5, moves to the guide roller 33, and rotates once. Meanwhile, the irradiation unit 12 finishes scanning and returns to its original position. Thereafter, by repeating this process, a large number of copies can be obtained in succession. The length of the photoreceptor belt used here is the maximum copy size + α (α is the irradiation unit 12
is long enough to absorb the return time of ), but there may be any number of segments.

As described above, in this invention, a charging window, a developing window, and a transfer window are formed on the peripheral wall of the case, which can be attached and detached within the housing. Since the photoreceptor belt is wound around a driving roller and a driven roller and moves in a meandering manner inside the case, the photoreceptor belt unit can be made smaller. The main body of the device can be made smaller, the photoreceptor belt can be easily replaced, the area around the photoreceptor belt can be maintained more freely, and the cleaning unit is installed inside the case. This has effects such as being able to prevent unnecessary toner from scattering after cleaning.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a conventional electrophotographic copying device, Fig. 2 is a cross-sectional explanatory view of an embodiment of this invention, Fig. 3 is a partially cutaway perspective view of the case, and Fig. 4 is a photoreceptor belt unit. 5 and 6 are explanatory views for attaching the photoreceptor belt unit to the main body of the apparatus, and FIG. 7 is an explanatory view for driving the drive roller. 12...Lighting unit, 21...Case, 22
...Charging window, 23...Development window, 24...Transfer window, 25...Cleaning unit, 30...
Drive roller, 31... Winding roller, 33...
Guide rollers, 34, 35, 36, 37... guide rollers, 41... photoreceptor belt.

Claims (1)

[Scope of utility model registration request] A case is removably installed below the illumination unit that scans inside the housing, and this case has a charging window for charging, a developing window for developing, and a transfer window for transferring images formed on its peripheral wall. 1. An electrophotographic copying apparatus, comprising: a cleaning unit; and a photosensitive belt that is wound around a driving roller and a driven roller and moves in a meandering manner.