CA1069578A - Construction of a photosensitive drum - Google Patents
Construction of a photosensitive drumInfo
- Publication number
- CA1069578A CA1069578A CA242,292A CA242292A CA1069578A CA 1069578 A CA1069578 A CA 1069578A CA 242292 A CA242292 A CA 242292A CA 1069578 A CA1069578 A CA 1069578A
- Authority
- CA
- Canada
- Prior art keywords
- drum
- roller
- edge portions
- peripheral
- photosensitive drum
- 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.)
- Expired
Links
- 238000010276 construction Methods 0.000 title abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 238000005299 abrasion Methods 0.000 claims abstract description 5
- 230000003405 preventing effect Effects 0.000 claims abstract 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 7
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- -1 alumite Substances 0.000 abstract 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 2
- 235000010210 aluminium Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 101100536354 Drosophila melanogaster tant gene Proteins 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
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
- G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
- G03G15/751—Details relating to xerographic drum, band or plate, e.g. replacing, testing relating to drum
-
- 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
- G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
- G03G15/11—Removing excess liquid developer, e.g. by heat
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Wet Developing In Electrophotography (AREA)
- Photoreceptors In Electrophotography (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
CONSTRUCTION OF A PHOTOSENSITIVE DRUM
ABSTRACT OF THE DISCLOSURE
A photosensitive drum for use in electro-photographic apparatus of wet developing type comprising an excess developing solution removal roller which is jux-taposed to the drum with a given spacing by act of a pair of bearing rollers being in rolling contact with lateral edge portions of the peripheral durm surface. The above edge portions are coated with a layer or film of a material such as alumite, stainless steel, etc. for abrasion prevent-ing purpose to thereby preserve the operation of the removal roller.
ABSTRACT OF THE DISCLOSURE
A photosensitive drum for use in electro-photographic apparatus of wet developing type comprising an excess developing solution removal roller which is jux-taposed to the drum with a given spacing by act of a pair of bearing rollers being in rolling contact with lateral edge portions of the peripheral durm surface. The above edge portions are coated with a layer or film of a material such as alumite, stainless steel, etc. for abrasion prevent-ing purpose to thereby preserve the operation of the removal roller.
Description
BACKGROIJND OF THE INV~:NTION
The invention relates to the construction o~ a photosensitive drum which i~ used in an electrophoto-graphic apparatus of wet developing type.
_IEF DESCRIPTION OF THE DRAWINGS
~ igo 1 i8 a schematlc side elevation of a conventional electrophotographic mahine including a photo-sensitive drum and related parts;
Fig. 2 is a front view of an apparatus for ., removing an excess amount of developing solution, the photo-sensitive drum being shown as constructed in accordance wlth the prior art practice;
~ ig. 3 iB a fragmentary perspective view of the apparatus for removing an excess amount of developing solutlon, the photosensitive drum shown being con~tructed in accordance with one embodiment of the present invention;
~ ig. 4 18 a fragmentary cross section of the apparatus shown in Fig. 3; and Fig. 5 is a fragmentary section illustrating another embodlment of the photosensitive drum.
AB illustrated in ~ig. 1, in a ~et develop-ing proCesB ~ a photosensitive drum 1 is charged at a charing station 2, and is exposed to projected light to have an electrostatic latent image formed thereon, which image iB converted into a visual image at a'developing ' station 4. A~ter an excess amount of developing solution which remains on the photosen~itive drum 1 is removed by a roller 5, the visual lmage on the drum is transferred onto a transfer sheet 7 by means of a transfer charger S, and the transfer sheet iB separated from the drum at a separating station 8.
7 ~
'~
~ ~ ~7 ~
The remo~al of t~e exces~ amou~t of develop-irlg ~olution from the photosensitivë drum 1 takes place in the manner illustrated in Fig. 2. Specifically, the roller 5 is located ad~acent to the drum 1 with a given spacing t therebetween. A pair of bearing rollers 9 of diameter which is by 2t greater than that o~ the roller 5 are concentrically mounted on the opposit~ ends of a rotating shaft 11 which carries the roller 5. ~he rotat-ing shaft 11 is supported by a pair of bearing~ 12, and a compre~ion ~pring 14 interpo~ed between each of the bearing 12 and a stationary member 13 urges the bearing rollers 9 again~t the drum ~ur~ace along itB oppoBite lat-eral edges. ~he drum 1 and the roller 5 are driven counter-clockwise, as viewed in Fig. 1, whereby any exces~ amount of developing ~olutlon which i8 carried on the drum sur-fsce 18 removed as it passes through the close spacing t.
As mentioned previously, the bearing rollers 9 rotate in the opposite direction from that of the drum 1 wh~le bearing against the latter. A conventional photo-sensitive drum is made from a variety of materials taking into consideration the requirement for a reduced weight.
In one example, the drum is integrally molded from alumin-ium, and is then machined to a required configuration.
~hereupon, a photo~ensltive layer of a material such as selenium, for example, ie formed on the peripheral surface of the drum. When the drum 1 is made from a relatively ~oft material in this manner, the lateral edge region~ la of the drum will be sub~ected to abrasion because of the con~tant abutting engagement with the bearing rollers 9 which are made of a relatively hard material. As the abra-slon proceeds, the spacing t formed between the drum 1 and the roller 5 will decrease gradually, eventually causlng a serious lnfluence upon the image formed on the drum 1 ~ o6g~7~
such as erasure or distortion of the image.
SlJMMARY OF THE INVENTION
It is an object of the lnvention to over-come the abovementioned di~advantage of the prior art by providing a photosensitive drum of a ~imple construction which maintains a uniform effect in the removal of an exce~s amount of developing ~olution.
More particularly, there is provided:
in electrophot~graphic apparatus of wet developing type comprising a photosensitive drum supported for rotation and having a photosensitive layer formed on the peripheral surface thereof and an excess developing solution removal de-vice comprising an excess solution removal roller juxtaposed to said drum for rotation, means for urging said roller toward said drum and a pair of bearing rollers rotatably and concen-trically mounted on opposite ends of said removal roller so as to be in rolling contact with respective lateral edge portions of said peripheral drum surface to thereby maintain a given spacing between said drum and said removal roller, said photo-sensitive drum comprising a aluminum drum body and an abrasionpreventing layer formed of oxidized alumite and having a hardness greater than that of said drum body and coated .n said lateral edge portions of said peripheral drum surface.
DETAILED D~S~RIP~ION 0~ ~MBODIMENTS
Referring to ~ig. 3, there is shown a photo-8ensiti~e drum 21 which is constructed in accordance with one embodiment of the invention. Specifically, the oppo-~ite lateral edge regions of the peripherary of the drum are uniformly formed with a haxdened layer 22 of a given thic~ne88. The hardened layer may be iormed $n a number \~l - ...
~0~957~3 of ways. In one example, where the drum 21 18 formed of allLminium, the drum surface may be oxldized ln the region of the lateral edge8 to form an alumite Yilm which exhlb$ts a hlgh resistance to abrasion.
Referring to Fig. 4, the peripheral surrace -4a-7~
of the photoaensitlve drum 21 iR formed with a photosensi-tive layer 21a of a material such a~ selenium, for example, in its region located opposite to a roller 2~, which i~
clo~ely spaced therefrom with a given spacing t. Mounted on the opposite ends of a rotating shaft 25 which carries the roller 23 are a palr of rolling bearing~ 24 in concen-tric manner with the roller 23. The rolling bearings 24 are posltioned so a~ to bear against the hard0ned layer 22 on the photosensitive drum 21, and hav~e an outer dia-meter which i9 sized 80 that the spacing formed betweenthe roller 23 and the photosensitive layer 21a is equal to a given value t.
As shown in Fig. ~, the drum 21 rotates in the counterclockwise direction, indicated by an arrow A, a~ does the roller 23, whereby any excess amount of devel-oping eolutlon remainlng on the drum 21 i8 removed as it passee through the spacing t therebetween. The rolling bearin~ 24 which bear against the hardened layer 22 on the drum 21 rotate in a direction indicated by an arrow ~, as the drum 21 rotates. ~he pro~ision of the hardened layers 22 on the opposite lateral edge region~ of the drum prevents or minimizes the abrasion of the material of the drum. The similar effect can be achieved by providing a highly hard member 26 such as a stainless steel, for example, on the opposlte lateral edge regions of the drum 21, as illustrated in Fig. 5.
:: . : , . ..
. ; :, .
;: .
The invention relates to the construction o~ a photosensitive drum which i~ used in an electrophoto-graphic apparatus of wet developing type.
_IEF DESCRIPTION OF THE DRAWINGS
~ igo 1 i8 a schematlc side elevation of a conventional electrophotographic mahine including a photo-sensitive drum and related parts;
Fig. 2 is a front view of an apparatus for ., removing an excess amount of developing solution, the photo-sensitive drum being shown as constructed in accordance wlth the prior art practice;
~ ig. 3 iB a fragmentary perspective view of the apparatus for removing an excess amount of developing solutlon, the photosensitive drum shown being con~tructed in accordance with one embodiment of the present invention;
~ ig. 4 18 a fragmentary cross section of the apparatus shown in Fig. 3; and Fig. 5 is a fragmentary section illustrating another embodlment of the photosensitive drum.
AB illustrated in ~ig. 1, in a ~et develop-ing proCesB ~ a photosensitive drum 1 is charged at a charing station 2, and is exposed to projected light to have an electrostatic latent image formed thereon, which image iB converted into a visual image at a'developing ' station 4. A~ter an excess amount of developing solution which remains on the photosen~itive drum 1 is removed by a roller 5, the visual lmage on the drum is transferred onto a transfer sheet 7 by means of a transfer charger S, and the transfer sheet iB separated from the drum at a separating station 8.
7 ~
'~
~ ~ ~7 ~
The remo~al of t~e exces~ amou~t of develop-irlg ~olution from the photosensitivë drum 1 takes place in the manner illustrated in Fig. 2. Specifically, the roller 5 is located ad~acent to the drum 1 with a given spacing t therebetween. A pair of bearing rollers 9 of diameter which is by 2t greater than that o~ the roller 5 are concentrically mounted on the opposit~ ends of a rotating shaft 11 which carries the roller 5. ~he rotat-ing shaft 11 is supported by a pair of bearing~ 12, and a compre~ion ~pring 14 interpo~ed between each of the bearing 12 and a stationary member 13 urges the bearing rollers 9 again~t the drum ~ur~ace along itB oppoBite lat-eral edges. ~he drum 1 and the roller 5 are driven counter-clockwise, as viewed in Fig. 1, whereby any exces~ amount of developing ~olutlon which i8 carried on the drum sur-fsce 18 removed as it passes through the close spacing t.
As mentioned previously, the bearing rollers 9 rotate in the opposite direction from that of the drum 1 wh~le bearing against the latter. A conventional photo-sensitive drum is made from a variety of materials taking into consideration the requirement for a reduced weight.
In one example, the drum is integrally molded from alumin-ium, and is then machined to a required configuration.
~hereupon, a photo~ensltive layer of a material such as selenium, for example, ie formed on the peripheral surface of the drum. When the drum 1 is made from a relatively ~oft material in this manner, the lateral edge region~ la of the drum will be sub~ected to abrasion because of the con~tant abutting engagement with the bearing rollers 9 which are made of a relatively hard material. As the abra-slon proceeds, the spacing t formed between the drum 1 and the roller 5 will decrease gradually, eventually causlng a serious lnfluence upon the image formed on the drum 1 ~ o6g~7~
such as erasure or distortion of the image.
SlJMMARY OF THE INVENTION
It is an object of the lnvention to over-come the abovementioned di~advantage of the prior art by providing a photosensitive drum of a ~imple construction which maintains a uniform effect in the removal of an exce~s amount of developing ~olution.
More particularly, there is provided:
in electrophot~graphic apparatus of wet developing type comprising a photosensitive drum supported for rotation and having a photosensitive layer formed on the peripheral surface thereof and an excess developing solution removal de-vice comprising an excess solution removal roller juxtaposed to said drum for rotation, means for urging said roller toward said drum and a pair of bearing rollers rotatably and concen-trically mounted on opposite ends of said removal roller so as to be in rolling contact with respective lateral edge portions of said peripheral drum surface to thereby maintain a given spacing between said drum and said removal roller, said photo-sensitive drum comprising a aluminum drum body and an abrasionpreventing layer formed of oxidized alumite and having a hardness greater than that of said drum body and coated .n said lateral edge portions of said peripheral drum surface.
DETAILED D~S~RIP~ION 0~ ~MBODIMENTS
Referring to ~ig. 3, there is shown a photo-8ensiti~e drum 21 which is constructed in accordance with one embodiment of the invention. Specifically, the oppo-~ite lateral edge regions of the peripherary of the drum are uniformly formed with a haxdened layer 22 of a given thic~ne88. The hardened layer may be iormed $n a number \~l - ...
~0~957~3 of ways. In one example, where the drum 21 18 formed of allLminium, the drum surface may be oxldized ln the region of the lateral edge8 to form an alumite Yilm which exhlb$ts a hlgh resistance to abrasion.
Referring to Fig. 4, the peripheral surrace -4a-7~
of the photoaensitlve drum 21 iR formed with a photosensi-tive layer 21a of a material such a~ selenium, for example, in its region located opposite to a roller 2~, which i~
clo~ely spaced therefrom with a given spacing t. Mounted on the opposite ends of a rotating shaft 25 which carries the roller 23 are a palr of rolling bearing~ 24 in concen-tric manner with the roller 23. The rolling bearings 24 are posltioned so a~ to bear against the hard0ned layer 22 on the photosensitive drum 21, and hav~e an outer dia-meter which i9 sized 80 that the spacing formed betweenthe roller 23 and the photosensitive layer 21a is equal to a given value t.
As shown in Fig. ~, the drum 21 rotates in the counterclockwise direction, indicated by an arrow A, a~ does the roller 23, whereby any excess amount of devel-oping eolutlon remainlng on the drum 21 i8 removed as it passee through the spacing t therebetween. The rolling bearin~ 24 which bear against the hardened layer 22 on the drum 21 rotate in a direction indicated by an arrow ~, as the drum 21 rotates. ~he pro~ision of the hardened layers 22 on the opposite lateral edge region~ of the drum prevents or minimizes the abrasion of the material of the drum. The similar effect can be achieved by providing a highly hard member 26 such as a stainless steel, for example, on the opposlte lateral edge regions of the drum 21, as illustrated in Fig. 5.
:: . : , . ..
. ; :, .
;: .
Claims
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In electrophotographic apparatus of wet developing type comprising a photosensitive drum supported for rotation and having a photosensitive layer formed on the peripheral surface thereof and an excess developing solution removal de-vice comprising an excess solution removal roller juxtaposed to said drum for rotation, means for urging said roller toward said drum and a pair of bearing rollers rotatably and concen-trically mounted on opposite ends of said removal roller so as to be in rolling contact with respective lateral edge portions of said peripheral drum surface to thereby maintain a given spacing between said drum and said removal roller, said photo-sensitive drum comprising a aluminum drum body and an abrasion preventing layer formed of oxidized alumite and having a hardness greater than that of said drum body and coated on said lateral edge portions of said peripheral drum surface.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP129075A JPS5178333A (en) | 1974-12-28 | 1974-12-28 | KANKOTAIDORAMUNOKOZO |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1069578A true CA1069578A (en) | 1980-01-08 |
Family
ID=11497314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA242,292A Expired CA1069578A (en) | 1974-12-28 | 1975-12-22 | Construction of a photosensitive drum |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5178333A (en) |
| CA (1) | CA1069578A (en) |
| DE (1) | DE2558451C2 (en) |
| GB (1) | GB1481003A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5854960A (en) * | 1994-10-28 | 1998-12-29 | Indigo N.V. | Squeegee roller for imaging systems |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53103737U (en) * | 1977-01-26 | 1978-08-21 | ||
| JPS5819565Y2 (en) * | 1978-12-22 | 1983-04-22 | 株式会社東芝 | Photosensitive drum for electrophotography |
| US4364661A (en) * | 1980-05-13 | 1982-12-21 | Savin Corporation | Process and apparatus for transferring developed electrostatic images to a carrier sheet, improved carrier sheet for use in the process and method of making the same |
| JPS5778068U (en) * | 1980-10-30 | 1982-05-14 | ||
| DE3213797A1 (en) * | 1982-04-15 | 1983-10-20 | Hoechst Ag, 6230 Frankfurt | ELECTROPHOTOGRAPHIC COPYING METHOD AND DEVICE FOR REMOVING THE DEVELOPER LIQUID FROM A PHOTO CONDUCTOR SURFACE |
| DE3213798A1 (en) * | 1982-04-15 | 1983-10-20 | Hoechst Ag, 6230 Frankfurt | ELECTROPHOTOGRAPHIC COPYING METHOD FOR REMOVING DEVELOPER LIQUID FROM A PHOTO CONDUCTOR SURFACE |
| JPS62113111U (en) * | 1986-01-06 | 1987-07-18 | ||
| JPS6311665U (en) * | 1986-07-07 | 1988-01-26 | ||
| US5369477A (en) * | 1993-12-07 | 1994-11-29 | Hewlett-Packard Company | Liquid electrophotography fluid containment and belt tracking device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE514705A (en) * | 1951-06-25 | |||
| BE628026A (en) * | 1962-02-08 | |||
| US3367852A (en) * | 1964-10-29 | 1968-02-06 | United Aircraft Corp | Selected area hardcoating of aluminum |
| GB1198497A (en) * | 1966-11-15 | 1970-07-15 | Fuji Photo Film Co Ltd | Electrophotographic Print Marking Process for Metallic Materials |
| US3684368A (en) * | 1968-07-10 | 1972-08-15 | Hitachi Ltd | Xerographic apparatus |
| US3524799A (en) * | 1969-06-13 | 1970-08-18 | Reynolds Metals Co | Anodizing aluminum |
| CA964053A (en) * | 1971-07-08 | 1975-03-11 | Kazumi Umezawa | Liquid developing device in electrophotographic copying apparatus |
| JPS5022637A (en) * | 1973-06-26 | 1975-03-11 |
-
1974
- 1974-12-28 JP JP129075A patent/JPS5178333A/en active Granted
-
1975
- 1975-12-11 GB GB5082675A patent/GB1481003A/en not_active Expired
- 1975-12-22 CA CA242,292A patent/CA1069578A/en not_active Expired
- 1975-12-23 DE DE19752558451 patent/DE2558451C2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5854960A (en) * | 1994-10-28 | 1998-12-29 | Indigo N.V. | Squeegee roller for imaging systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5178333A (en) | 1976-07-07 |
| JPS5746551B2 (en) | 1982-10-04 |
| GB1481003A (en) | 1977-07-27 |
| DE2558451C2 (en) | 1981-09-24 |
| DE2558451A1 (en) | 1976-07-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |