EP0473303A1 - Electrophotograhic apparatus - Google Patents
Electrophotograhic apparatus Download PDFInfo
- Publication number
- EP0473303A1 EP0473303A1 EP91307250A EP91307250A EP0473303A1 EP 0473303 A1 EP0473303 A1 EP 0473303A1 EP 91307250 A EP91307250 A EP 91307250A EP 91307250 A EP91307250 A EP 91307250A EP 0473303 A1 EP0473303 A1 EP 0473303A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- unit
- image forming
- developing unit
- forming unit
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1803—Arrangements or disposition of the complete process cartridge or parts thereof
- G03G21/1817—Arrangements or disposition of the complete process cartridge or parts thereof having a submodular arrangement
- G03G21/1821—Arrangements or disposition of the complete process cartridge or parts thereof having a submodular arrangement means for connecting the different parts of the process cartridge, e.g. attachment, positioning of parts with each other, pressure/distance regulation
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1661—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
- G03G2221/1651—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts for connecting the different parts
- G03G2221/1654—Locks and means for positioning or alignment
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
- G03G2221/1678—Frame structures
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
- G03G2221/18—Cartridge systems
- G03G2221/183—Process cartridge
- G03G2221/1846—Process cartridge using a handle for carrying or pulling out of the main machine
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
- G03G2221/18—Cartridge systems
- G03G2221/183—Process cartridge
- G03G2221/1853—Process cartridge having a submodular arrangement
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Electrophotography Configuration And Component (AREA)
Abstract
Description
- The present invention relates to an electrophotographic apparatus and, more particularly, to an electrophotographic apparatus provided with a detachable image forming unit and a detachable developing unit.
- Generally, the image forming unit of an electrophotographic apparatus is replaced frequently with a new one because of its life shorter than those of other components, and the developing unit of the same is removed frequently to replenish the same with a toner. As shown in Fig. 7, a conventional electrophotographic apparatus is provided with an
image forming unit 56 comprising awaste toner container 54, aphotoconductive drum 55 and a charger, a developingunit 59 comprising atoner container 57 provided with a developing roller, a blade and a stirrer, and atoner cartridge 58 combined with thetoner container 57, abasket 50 having a partly open bottom wall,handles 51 andslots photoconductive unit 57 and the developingunit 59, and placed in a housing having an open upper surface. Theimage forming unit 56 is received in thebasket 50 withbearings 60 rotatably supporting thephotoconductive drum 55 received in theslots 52 of thebasket 50, and the developingunit 59 is received in thebasket 50 withprojections 61 projecting outward in opposite directions, respectively, from thetoner container 57 received in theslots 53. A sheet transportation path along which a sheet is transported, a transfer unit for transferring a toner image formed on thephotoconductive drum 55 to a sheet and a fixing unit for fixing the toner image transferred from thephotoconductive drum 55 to the sheet to the same, not shown, are arranged in the housing. An exposure unit, not shown, for applying light signals representing picture information to thephotoconductive drum 55 is provided on a top cover, not shown, covering the open upper surface of the housing. - In removing the
image forming unit 56 and the developingunit 59 from the housing, the top cover is opened and thebasket 50 is held at thehandles 51 and lifted up. In placing theimage forming unit 56 and the developingunit 59 in the housing, thebasket 50 containing theimage forming unit 56 and the developingunit 59 is placed in the housing. - The electrophotographic apparatus shown in Fig. 7, however, needs the
basket 50 as an additional part only for removing theimage forming unit 56 and the developingunit 59 from and placing the same in the housing. Since thebasket 50 is comparatively large, the housing must be formed in a comparatively large size and hence the cost of the electrophotographic apparatus increases accordingly. - It is a first object of the present invention to provide an electrophotographic apparatus provided with an image forming unit and a developing unit which can detachably be installed in a housing without using any additional part, such as a basket.
- A second object of the present invention is to facilitate removing an image forming unit and a developing unit from and placing the same in a housing.
- A third object of the present invention to provide a processing unit comprising, in combination, an image forming unit and a developing unit.
- A fourth object of the present invention is to facilitate separating an image forming unit from a developing unit.
- The present invention provides an electrophotographic apparatus comprising: a housing containing a sheet transportation path, a transfer unit and a fixing unit, and having an open upper surface; a top cover holding an exposure unit and pivotally supported on the housing so as to cover the open upper surface of the same; an image forming unit comprising at least a photoconductive drum and a charger; a developing unit provided with a toner container; holding members disposed in the housing on the opposite sides, respectively, of the sheet transportation path to hold the image forming unit and the developing unit so as to be removed upward therefrom; supporting members provided in the developing unit to support the image forming unit; and handles attached to the developing unit so as to extend upward from the developing unit.
- The image forming unit is supported on the supporting members of the developing unit. Therefore, the image forming unit can be removed together with the developing unit from the housing by holding the developing unit at the handles and lifting up the developing unit after turning the top cover to open the open upper surface of the housing. Thus, the image forming unit and the developing unit can be removed from and placed in the housing without requiring any additional parts.
-
- Figure 1 is an exploded perspective view of an electrophotographic apparatus in a first embodiment according to the present invention;
- Figure 2 is a side view of a combination of an image forming unit and a developing unit;
- Figure 3 is a side view of the image forming unit;
- Figure 4 is a side view of the developing unit;
- Figure 5 is a schematic plan view showing the positional relation between the image forming unit and the developing unit;
- Figure 6 is a perspective view of an electrophotographic apparatus in a second embodiment according to the present invention; and
- Figure 7 is an exploded perspective view of a conventional electrophotographic apparatus.
- An electrophotographic apparatus in a first embodiment according to the present invention will be described with reference to Figs. 1 to 5. Referring to Figs. 1 to 5, a
top cover 2 is joined pivotally to a housing 1 so as to close the open upper surface of the housing 1. Side plates 4 are disposed in the housing 1 on the opposite sides, respectively, of a sheet transportation path 3 formed in the housing 1. A transfer unit, not shown, for transferring a toner image formed on the outer circumference of aphotoconductive drum 10, which will be described later, to a sheet, a fixing unit 5 for fixing the toner image transferred to the sheet to the same, and adelivery roller 6 are arranged along the sheet transportation path 3. Animage forming unit 7 and a developingunit 8 are disposed above the sheet transportation path 3 in the housing 1. Theimage forming unit 7 comprises awaste toner container 9, thephotoconductive drum 10 supported for rotation on thewaste toner container 9, and acharger 11 for applying a voltage to thephotoconductive drum 10, attached to thewaste toner container 9. Thewaste toner container 9 is provided withbearings 12 for supporting thephotoconductive drum 10 for rotation at the opposite ends thereof. The side plates 4 are provided withU-shaped slots 13 for receiving and locating thebearings 12 so that thebearings 12 can be removed upward therefrom. The developingunit 8 comprises a developing device, a blade, a stirrer, atoner container 14 containing the developing device, the blade and the stirrer, and atoner cartridge 15 having an opening in its lower surface and inserted in an opening formed in the upper wall of thetoner container 14. Pins 16 project outward from the opposite side walls of thetoner container 14. The side plates 4 is provided also with U-shapedslots 17 for receiving and locating thepints 16.Handles 18 are fixed to the opposite side walls of thetoner container 14 so as to project upward. Thehandles 18 are formed of a soft material, such as polypropylene, and capable of being bent at their base ends. Thehandles 18 are attached to thetoner container 14 at positions in a vertical plane including the center of gravity of the combination of theimage forming unit 7 and the developingunit 8 in a state where half the toner contained in thetoner cartridge 15 has been consumed. - As shown in Fig. 2 to 5,
pins 19 project outward from the opposite side walls of theimage forming unit 7, and supportingmembers 20 provided with U-shaped slots for receiving thepins 19 are provided on the inner surfaces of the opposite side walls of the developingunit 8. As shown in Fig. 1, anexposure unit 21 for applying light signals representing image signals to thephotoconductive drum 10 is attached to the inner surface of thetop cover 2. A delivery tray, not shown, is formed on the top surface of thetop cover 2. - As shown in Fig. 6, the position of the developing
sleeve 10a of the developingunit 8 relative to thephotoconductive drum 10 is determined by means ofgap adjusting disks 10c attached to theshaft 10b of the developingsleeve 10a. The developingsleeve 10a is disposed relative to thephotoconductive drum 10 so that thegap adjusting disks 10c are in rolling contact with the circumference of thephotoconductive drum 10. - The
image forming unit 7 is held stably in place with thebearings 12 received in theslots 13 and with thepins 19 received in the slots of the supportingmembers 20 of the developingunit 8. The developingunit 8 is held stably in place with thepins 16 received in theslots 17 and with the opposite ends of the developing roller thereof in contact with part of theimage forming unit 7. In removing the developingunit 8 together with theimage forming unit 7 from the housing 1, the developingunit 8 is held at thehandles 18 and the same is lifted up together with theimage forming unit 7 after turning thetop cover 2 to open the open upper surface of the housing 1. Thus, any additional parts are not needed to remove the developingunit 8 and theimage forming unit 7 together from and to place the same in the housing 1. Thus, the electrophotographic apparatus comprises a reduced number of parts, the housing 1 can be formed in a reduced size, and the electrophotographic apparatus can be fabricated at a reduced cost. Since thehandles 18 of the developingunit 8 can be bent at the respective base ends, the developingunit 8 can be packed for transportation in a small package. - Since the
image forming unit 7 is combined with the developing unit simply by inserting thepins 19 thereof in the U-shaped slots of the supportingmembers 20 of the developingunit 8, theimage forming unit 7 can readily be separated from the developingunit 8 simply by pulling up theimage forming unit 7 relative to the developingunit 8. Theimage forming unit 7 and the developingunit 8 can readily be assembled simply by lowering the image forming unit relative to the developingunit 8 so that thepins 19 are received in the supportingmembers 20. - An electrophotographic apparatus in a second embodiment according to the present invention will be described with reference to Fig. 6, in which parts like or corresponding to those of the electrophotographic apparatus in the first embodiment will be denoted by the same reference characters and the description thereof will be omitted. The developing
unit 8 of the electrophotographic apparatus in the second embodiment is provided withhinged handles 18, and theimage forming unit 7 of the same is provided with a L-shaped handles 7a. - The
image forming unit 7 is replaced with a new one at the termination of itsphotoconductive drum 10, while the developingunit 8 maintains its functions for a considerable long time only if the same is replenished with the toner. Thehandles 7a of theimage forming unit 7 enables removing only theimage forming unit 7 from the housing 1 to simplify replacing thephotoconductive drum 10 with a new one. Thehandles 18 of the developingunit 8 enables removing the developingunit 8 together with theimage forming unit 7 from the housing 1 to replace thephotoconductive drum 10 in replenishing the developingunit 8 with the toner. - Thus, the electrophotographic apparatus in accordance with the present invention comprises a housing containing a sheet transportation path, a transfer unit and a fixing unit, and having an open upper surface; a top cover holding an exposure unit and pivotally supported on the housing so as to cover the open upper surface of the same; an image forming unit comprising at least a photoconductive drum and a charger; a developing unit provided with a toner container; holding members disposed in the housing on the opposite sides, respectively, of the sheet transportation path to hold the image forming unit and the developing unit so as to be removed upward therefrom;supporting members provided in the developing unit to support the image forming unit; and handles attached to the developing unit so as to extend upward from the developing unit. Since the image forming unit is supported on the supporting members of the developing unit, the image forming unit can be removed together with the developing unit from the housing by holding the developing unit at the handles and lifting up the same after turning the top cover to open the open upper surface of the housing. Therefore, any additional parts are not needed to remove the image forming unit and the developing unit from and placing the same in the housing, so that the electrophotographic apparatus has a reduced number of parts, the housing can be formed in a reduced size, and the electrophotographic apparatus can be fabricated at a reduced cost.
Claims (6)
- An electrophotographic apparatus comprising:
a housing containing a sheet transportation path, a transfer unit and a fixing unit, and having an open upper surface;
an image forming unit comprising a photoconductive drum and a charger;
holding members disposed on the opposite sides of the sheet transportation path arranged in the housing to hold the image forming unit and the developing unit so that the image forming unit and the developing unit can be removed upward therefrom;
supporting members provided in the developing unit to support the image forming unit; and
handles provided in the developing unit so as to extend upward. - An electrophotographic apparatus according to Claim 1, wherein said handles are formed of a soft material.
- An electrophotographic apparatus according to Claim 1, wherein said handles are supported for turning.
- An electrophotographic apparatus according to Claim 1, wherein bearings rotatably supporting the photoconductive drum are received in holding members provided on said housing.
- An electrophotographic apparatus according to Claim 1, wherein said supporting members provided in the developing unit have U-shaped slots opening upward, respectively, the image forming unit is provided with pins extending so as to be received in the U-shaped slot of said supporting members, and the image forming unit is supported detachably on the developing unit with the pins received in the U-shaped slots of said supporting members.
- An electrophotographic apparatus according to Claim 1, wherein the image forming unit is provided with handles.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP89083/90 | 1990-08-24 | ||
JP1990089083U JP2530562Y2 (en) | 1990-08-24 | 1990-08-24 | Electrophotographic equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0473303A1 true EP0473303A1 (en) | 1992-03-04 |
EP0473303B1 EP0473303B1 (en) | 1994-01-05 |
Family
ID=13960973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91307250A Expired - Lifetime EP0473303B1 (en) | 1990-08-24 | 1991-08-07 | Electrophotograhic apparatus |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0473303B1 (en) |
JP (1) | JP2530562Y2 (en) |
KR (1) | KR920004922A (en) |
DE (1) | DE69100931T2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4138079A1 (en) * | 1991-04-17 | 1992-10-22 | Samsung Electronics Co Ltd | ELECTROPHOTOGRAPHIC PROCESSING UNIT |
DE4317392A1 (en) * | 1992-05-27 | 1993-12-02 | Sharp Kk | Image prodn. unit e.g. laser printer - with photo-receiving drum for transferring image formed on peripheral surface of drum on to transfer material with rotating drum and surrounding unit designed as process-exchange set |
EP0576758A2 (en) * | 1992-06-30 | 1994-01-05 | Canon Kabushiki Kaisha | Image forming system within which process cartridge is mountable |
EP0590940A2 (en) * | 1992-09-28 | 1994-04-06 | Fujitsu Limited | Process cartridge and image-forming apparatus |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4757344A (en) * | 1985-07-16 | 1988-07-12 | Ricoh Company, Ltd. | Imaging apparatus with detachable cartridges |
US4866482A (en) * | 1986-10-24 | 1989-09-12 | Ricoh Company, Ltd. | Image forming device for electrostatic recording apparatus having a slidable replacement holding case |
US4891678A (en) * | 1987-06-17 | 1990-01-02 | Ricoh Company, Ltd. | Electrostatic recording apparatus having a cooled and insulated waste toner container |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61230159A (en) * | 1985-04-04 | 1986-10-14 | Minolta Camera Co Ltd | Image forming device |
JPH064350Y2 (en) * | 1986-09-09 | 1994-02-02 | 東京電気株式会社 | Electrophotographic device |
JPH01136944U (en) * | 1988-03-11 | 1989-09-19 |
-
1990
- 1990-08-24 JP JP1990089083U patent/JP2530562Y2/en not_active Expired - Lifetime
-
1991
- 1991-08-07 EP EP91307250A patent/EP0473303B1/en not_active Expired - Lifetime
- 1991-08-07 DE DE69100931T patent/DE69100931T2/en not_active Expired - Fee Related
- 1991-08-13 KR KR1019910013962A patent/KR920004922A/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4757344A (en) * | 1985-07-16 | 1988-07-12 | Ricoh Company, Ltd. | Imaging apparatus with detachable cartridges |
US4866482A (en) * | 1986-10-24 | 1989-09-12 | Ricoh Company, Ltd. | Image forming device for electrostatic recording apparatus having a slidable replacement holding case |
US4891678A (en) * | 1987-06-17 | 1990-01-02 | Ricoh Company, Ltd. | Electrostatic recording apparatus having a cooled and insulated waste toner container |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 11, no. 107 (P-563)(2554), 4 April 1987; & JP - A - 61254956 (RICOH) 12.11.1986 * |
PATENT ABSTRACTS OF JAPAN vol. 11, no. 395 (P-650)(2842), 24 December 1987; & JP - A - 62159157 (YAMANASHI DENSHI KOGYO) 15.07.1987 * |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4138079A1 (en) * | 1991-04-17 | 1992-10-22 | Samsung Electronics Co Ltd | ELECTROPHOTOGRAPHIC PROCESSING UNIT |
DE4138079C2 (en) * | 1991-04-17 | 1997-11-13 | Samsung Electronics Co Ltd | Electrophotographic process unit |
DE4317392A1 (en) * | 1992-05-27 | 1993-12-02 | Sharp Kk | Image prodn. unit e.g. laser printer - with photo-receiving drum for transferring image formed on peripheral surface of drum on to transfer material with rotating drum and surrounding unit designed as process-exchange set |
US5353100A (en) * | 1992-05-27 | 1994-10-04 | Sharp Kabushiki Kaisha | Image apparatus with removable process kit rotatable about a photoreceptor shaft |
DE4317392C2 (en) * | 1992-05-27 | 2002-12-05 | Sharp Kk | Electrophotographic printer |
EP0576758A2 (en) * | 1992-06-30 | 1994-01-05 | Canon Kabushiki Kaisha | Image forming system within which process cartridge is mountable |
EP0576758B1 (en) * | 1992-06-30 | 1998-02-18 | Canon Kabushiki Kaisha | Image forming system within which process cartridge is mountable |
EP0590940A2 (en) * | 1992-09-28 | 1994-04-06 | Fujitsu Limited | Process cartridge and image-forming apparatus |
EP0590940A3 (en) * | 1992-09-28 | 1995-07-26 | Fujitsu Ltd | Process cartridge and image-forming apparatus. |
EP0837374A2 (en) * | 1992-09-28 | 1998-04-22 | Fujitsu Limited | Image-forming apparatus |
EP0837374A3 (en) * | 1992-09-28 | 1998-10-21 | Fujitsu Limited | Image-forming apparatus |
Also Published As
Publication number | Publication date |
---|---|
EP0473303B1 (en) | 1994-01-05 |
DE69100931T2 (en) | 1994-07-21 |
JPH0446448U (en) | 1992-04-20 |
DE69100931D1 (en) | 1994-02-17 |
JP2530562Y2 (en) | 1997-03-26 |
KR920004922A (en) | 1992-03-28 |
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