US3740789A - Xerographic roller oscillating cleaning blade with drive mechanism therefor - Google Patents

Xerographic roller oscillating cleaning blade with drive mechanism therefor Download PDF

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Publication number
US3740789A
US3740789A US00183831A US3740789DA US3740789A US 3740789 A US3740789 A US 3740789A US 00183831 A US00183831 A US 00183831A US 3740789D A US3740789D A US 3740789DA US 3740789 A US3740789 A US 3740789A
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US
United States
Prior art keywords
blade
cutting edge
carriage
plate
xerographic
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Expired - Lifetime
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US00183831A
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English (en)
Inventor
R Ticknor
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Xerox Corp
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Xerox Corp
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Publication date
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    • 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
    • G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
    • G03G21/0011—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using a blade; Details of cleaning blades, e.g. blade shape, layer forming
    • G03G21/0029—Details relating to the blade support

Definitions

  • the apparatus includes an elastomeric doctor blade disposed across the path of movement of the plate and having a cutting edge thereon biased into contact with the photoconductive surface.
  • the blade is supported within a carriage and the carriage arranged to move along a path of travel substantially transverse to the path of movement of the plate.
  • operatively associated with the carriage is provided to periodically reposition the blade incrementally ong its path of travel thereby improving the blade efficiency and blade life as well as reducing the possibility of foreign matter from being permanently entrapped between the blade and the photoconductor.
  • a latent electrostatic image of an original to be reproduced is recorded upon an image retaining member and the image then made visible, or developed, by use of a finely divided toner material which has been specifically developed for this purpose.
  • the developed toner image is generally transferred from the xerographic plate to a final support material, such as paper or the like, and the image affixed thereto to form a permanent record of the original.
  • a preponderance of the toner material comprising the developed image is removed to the final support sheet, a small amount of residual toner nevertheless is retained upon the plate surface after the transfer operation. In order to preserve the integrityof the reusable plate, this vestige of toner must be cleaned therefrom before a new imaging cycle is initiated.
  • the cleaning of the xerographic plate may be accomplished in a number of different ways.
  • One prevalent technique is to remove the residual toner from the plate by means of an elastomeric doctor blade as disclosed in US. Pat. No. 3,660,863.
  • This particular type of cleaning necessitates that the cutting edge of the doctor blade be arranged in moving biased contact with the image bearing plate surface whereby the blade is caused to pass between the plate and any foreign matter supported thereon.
  • any defects or protrusions contained in or on the surface of the plate will in most instances cause ineffective cleaning and result in a rapid and uneven wearing of the blade due to high stresses produced in these localized regions.
  • Another object of this invention is to improve the efficiency of doctor blade cleaning in the automatic xerographic process.
  • a still further object of this invention is to prolong the life of a doctor blade used to clean residual toner material from an image retaining element.
  • Another object of this invention is to provide a doctor blade cleaning device that will substantially eliminate localized blade failures caused by irregularities in the surface of the member being cleaned.
  • a further object of this invention is to improve the quality of copy produced in an automatic xerographic reproducing machine.
  • a cleaning device comprised of at least one doctor blade member having a cutting edge riding in contact with a moving photoconductive plate and being of sufficient length to span the entire image recording area thereon, means to periodically reposition the blade in small increments along a path of travel that is transverse to the path of movement of the plate to facilitate cleaning, and control means to regulate the incremental stepping of the blade to sustain the reciprocal motion of the blade for at least as long as the plate is in motion thereby enhancing blade life and its cleaning efficiency.
  • FIG. 1 is a schematic view of an automatic xerographic reproducing machine incorporating the improved doctor blade cleaning apparatus of the present invention
  • FIG. 2 is a perspective view partiallybroken away showing the blade cleaning apparatus illustrated in FIG. 1.
  • an automatic xerographic reproducing machine incorporating the improved doctor blade cleaning apparatus of the present invention.
  • the copying machine employs a drum like member 10, the outer periphery of which is furnished with a suitable xerographic imaging or photoconductive material 11 in a manner known to those skilled in the art.
  • Drum 10 which is suitably journaled for rotation within the machine by means of a shaft 13, rotates in the direction indicated in FIG. 1 to bring the image retaining surface 11 thereof past a plurality of xerographic processing stations.
  • Suitable drive means (not shown) are provided to power and coordinate the motion of the various machine operating components whereby a faithful reproduction on the original input scene information is produced.
  • the various processing stations for producing a copy of the original are herein represented as blocks A, B, C, D and E.
  • station A a uniform charge is placed upon the photoconductive surface of the drum.
  • the charged drum surface is then passed through an exposure station B for illuminating the charged surface with a light image of the original input scene information whereby the charge is selectively dissipated in the light struck regions to record the original information in the fonn of a latent electrostatic image.
  • Means for applying toner material to the image bearing surface is provided at station C wherein the latent image is made visible.
  • the developed image is then brought into contact with the final support material 14 at station D and the toner image transferred from the plate surface to a final support sheet.
  • the improved doctor blade cleaning apparatus of the present invention removes residual toner material from the photoconductive surface in a manner to be explained in greater de- 1 blade should be equal to the width of the photoconductive layer supported on the drum surface plus the total amount that the blade is to be extended as it is stepped back and forth in a reciprocal manner over its prescribed path of travel.
  • the blade is also preferably positioned with the cutting edge extending towards the drum in a direction substantially opposed to the direction of drum movement so that the cutting edge thereon is caused to move between the residual toner and the drum surface to effect cleaning.
  • the relative angles between the blade surfaces and the plane tangent to the line of contact between the blade edge 22 and drum surface 11 is selected for optimum cleaning or toner removal effect.
  • Blade 20 is comprised of any suitable flexible material such as polyurethane or the like.
  • the elastomeric blade material employed should be relatively soft to prevent or minimize abrasion, scratching etc. of the photoconductive surface 11 and the material should have sufficient strength and resiliency to allow effective cleaning of surface 11.
  • toner particles removed from the drum surface are allowed to fall downwardly into contact with a sealing roll 25.
  • the cylindrical sealing roll has an extended surface thereon being at least equal in length to the width of the cylindrical drum surface.
  • the sealing roll is rotatably supported between the side walls of the cleaning housing so as to ride in pressure contact against the drum surface as the two members are rotated in the directions indicated.
  • An outer blanket 26, constructed of a relatively smooth resilient material is placed over the outside of the roll and the roll supported in relation to the xerographic plate so that the blanket is lightly biased into pressure contact against the drum surface.
  • the roll 25 serves as a movable seal to prevent the toner material cleaned from the drum surface by the blade from leaving the cleaning zone.
  • the roll also serves on the plate surface as an expedient for transporting the removed toner particles away from the photoconductive drum surface towards a toner collection station 31.
  • a pair of cooperating gear members 27, 28 (FIG. 2) having a 1 to 1 ratio coordinates the motion of the sealing roll with that of the xerographic drum so that the two contacting surfaces move at the same relative speed.
  • the cleaned or separated toner material in contact therewith is carried away from the drum area on the surface of the roll and the toner is then scraped from the roll surface by means of a scraper bar 30 and allowed to fall into the collecting station 31.
  • the toner is then picked up by a rotating paddle block 32 and pumped laterally to the rear of the housing into a storage area 35.
  • a second flexible scraper bar 36 is extended downwardly from the top wall of the housing and is arranged to span horizontally across the entire storage area of the housing.
  • the flexible scraper is adapted to clean residual toner material from the tips of the paddle block and also serves as a retaining wall to prevent toner materials stored within the storage area from being carried or migrating back into the cleaning region.
  • the doctor blade is periodically stepped in predetermined increments back and forth across the drum surface 11 over a path of travel substantially normal to the direction of motion of the drum.
  • the blade e1ement is supported within a U-shaped mounting bracket 40 and the bracket suspended from a support bar 42 by means of centrally located pivot pin 44.
  • the blade is free to swing about the axial center line of the pivot whereby the cutting edge of the blade is free to align itself across the width of the drum surface.
  • the support bar has rigidly affixed thereto a pair of hinges 46.
  • the hinges are both slidably and rotatably supported upon a hinge pin 47 anchored in the side walls of the housing.
  • the blade support assembly is offset horizontally from the hinge pin in the manner illustrated in FIG. 1 causing the entire assembly to want to rotate in a counter clockwise direction. This, in turn, mechanically biases the flexible blade into pressure contact with the drum surface with sufficient force to insure that a continuous unbroken line of contact is maintained between the cutting edge of the blade and the photoconductive surface being cleaned.
  • a drive mechanism acting in concert with a movable carriage 52.
  • the drive mechanism includes a ratchet 55, rotatably supported upon one end of tie rod 56 and being arranged to turn a cylindrical cam element 57 secured thereto.
  • Carriage 52 is slidably mounted upon the tie bar and is continually urged towards the cam element by means of a spring member 59 whereby cam follower 60, secured to the carriage, rides in contact with the contoured working profile of the cam.
  • Extended arm 61, of the carriage is provided with a slotted aperture 62 that operatively engages the raised portion of the right hand hinge 46.
  • the prescribed cam motion is translated through the movable carriage and the blade support assembly to produce a longitudinally back and forth motion of the blade across the drum surface over its predetermined path of travel.
  • the cam is adapted so as to translate a constant velocity to the blade holding element, however, any suitable motion producing efficient cleaning may be employed.
  • a speed control unit made up of pawl 70, which operatively engages ratchet 55, and a speed reducing gear 71 are secured to the paddle block shaft 73.
  • the reducing gear meshes with a drive pinion 74 which is driven by the sealing roll drive shaft 75.
  • the pawl is eccentrically mounted upon its supporting shaft so that the tip of pawl arm 77, which is adapted to engage the teeth of ratchet 55, advances the ratchet a predetermined distance for each revolution of the shaft.
  • a locking mechanism also is arranged to ride in engagement with the ratchet teeth and prevents the ratchet from slipping backwardly in a counter clockwise direction as the pawl arm is pulled back preparatory to the next subsequent advancing stroke.
  • the ratchet arrangement together with the reduction gear 71 are chosen to periodically turn the cam element relative to the drum speed thereby incrementally repositioning the blade el- 5 ement in a manner wherein the blade moves back and forth over a path of travel parallel to the drum surface.
  • Periodically repositioning the blade in increments of approximately 0.025 inches over a path of travel of about 0.25 inches while acting upon a photoconductive surface that is moving at approximately 3.5 inches per second has resulted in efficient plate cleaning with a minimum of blade wear.
  • different lengths and speeds might be contemplated and it should be clear that this disclosure is not necessarily confined to the details as set forth and it is intended to cover any such modifications or changes as may come within the scope of the following claims.
  • Means for cleaning residual toner particles from the surface of a movable image retaining member in preparation for imaging thereon including at least one blade like element having a cutting edge supported in contact with the surface of the image retaining member to be cleaned, the blade being of sufficient length to enable the cutting edge to span across the entire image retaining surface of said member,
  • Apparatus for cleaning a reusable movable xerographic plate including image retaining surface on said plate,
  • a carriage means for movably supporting said blade while in contact with said plate and being arranged to move said blade along a path of travel transverse to the moving xerographic plate
  • said reciprocating means includes a cylindrical cam having a working surface thereon being biased into contact with said carriage to impart a predetermined reciprocating motion to the carriage and said stepping means comprises a ratchet mechanism operatively connected to said cam and being arranged to periodically advance the working surface thereon whereby the carriage is incrementally advanced and returned over said path of travel.
  • said ratchet mechanism includes a pawl member in operative communication with said coordinating means.
  • a doctor blade cleaning apparatus of the type for removing residual toner particles from a reusable ph'otoconductive surface
  • said apparatus including means to move the photoconductive surface through a series of xerographic processing stations including an image .transfer station, support means, arranged to act upon the blade subsequent to the image transfer operation, for supporting the cutting edge of said blade in contact with the moving photoconductive surface whereby residual toner particles are removed from said photoconductive surface, the improvement comprising:

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)
US00183831A 1971-09-27 1971-09-27 Xerographic roller oscillating cleaning blade with drive mechanism therefor Expired - Lifetime US3740789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18383171A 1971-09-27 1971-09-27

Publications (1)

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US00183831A Expired - Lifetime US3740789A (en) 1971-09-27 1971-09-27 Xerographic roller oscillating cleaning blade with drive mechanism therefor

Country Status (9)

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US (1) US3740789A (enrdf_load_stackoverflow)
JP (1) JPS4843342A (enrdf_load_stackoverflow)
BE (1) BE789327A (enrdf_load_stackoverflow)
CA (1) CA991250A (enrdf_load_stackoverflow)
FR (1) FR2155320A5 (enrdf_load_stackoverflow)
GB (1) GB1403440A (enrdf_load_stackoverflow)
IT (1) IT967796B (enrdf_load_stackoverflow)
NL (1) NL7212330A (enrdf_load_stackoverflow)
SE (1) SE377202B (enrdf_load_stackoverflow)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927937A (en) * 1972-11-10 1975-12-23 Rank Xerox Ltd Cleaning assembly for an electrostatographic device
US4111545A (en) * 1975-02-06 1978-09-05 Xerox Corporation Vibrating blade cleaner
US4133073A (en) * 1976-04-14 1979-01-09 F.Lli Marzoli & C. S.P.A. Cleaning device for the scraper blades associated with rotating separation and/or clearing rollers for a textile fibre web in spinning machines
US4218131A (en) * 1975-01-17 1980-08-19 Canon Kabushiki Kaisha Cleaning device
US4218132A (en) * 1977-12-20 1980-08-19 Konishiroku Photo Industry Co., Ltd. Drum cleaning apparatus for electrophotographic copying machine
US4323306A (en) * 1975-01-17 1982-04-06 Canon Kabushiki Kaisha Developer cleaning device for electrophotography
US4400082A (en) * 1981-03-20 1983-08-23 Minolta Camera Kabushiki Kaisha Cleaning apparatus
US4499827A (en) * 1983-03-22 1985-02-19 Dai Nippon Insatsu Kabushiki Kaisha System for automatically removing dust from plate cylinders of printing press
US4509225A (en) * 1983-01-20 1985-04-09 Minnesota Mining And Manufacturing Company Pressure roll cleaning system
US4522487A (en) * 1979-06-08 1985-06-11 Tokyo Shibaura Denki Kabushiki Kaisha Sealing device for electrostatic copying machine
US4533035A (en) * 1984-01-04 1985-08-06 Material Control, Inc. Conveyor belt cleaner
US4533037A (en) * 1983-03-09 1985-08-06 Material Control, Inc. Telescoping conveyor belt cleaner
US4535883A (en) * 1983-03-09 1985-08-20 Material Control, Inc. Shock mount telescoping conveyor belt cleaner
US4577955A (en) * 1983-11-18 1986-03-25 Ricoh Company, Ltd. Electrophotographic copying apparatus including a guillotine cleaner blade arrangement and method of operation
DE3531581A1 (de) * 1984-09-06 1986-03-27 Sharp K.K., Osaka Reinigungsvorrichtung fuer elektrofotografische kopiergeraete
US4707115A (en) * 1986-08-28 1987-11-17 Xerox Corporation Device for cleaning a charging member
US4982239A (en) * 1987-08-07 1991-01-01 Canon Kabushiki Kaisha Image forming apparatus having reciprocating cleaning means
US5143555A (en) * 1990-02-21 1992-09-01 International Paper Company Travelling doctor blade
US5213040A (en) * 1991-12-03 1993-05-25 Toshiba Kikai Kabushiki Kaisha Automatic cleaning apparatus for gravure plate cylinders
US6463254B1 (en) 2001-05-09 2002-10-08 Lexmark International, Inc. Toner cleaner system vibrator and method
US20100150626A1 (en) * 2008-12-11 2010-06-17 Walter Kopp Cleaning arrangement for a moving element to be cleaned in an electrographic printing apparatus
EP2950161A1 (en) * 2014-05-27 2015-12-02 KYOCERA Document Solutions Inc. Cleaning device
US11294322B2 (en) * 2018-09-17 2022-04-05 Hewlett-Packard Development Company, L.P. Cleaning of print apparatus components with rotation and oscillation

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5539388Y2 (enrdf_load_stackoverflow) * 1974-09-06 1980-09-13
JPS5853547Y2 (ja) * 1974-09-26 1983-12-06 ミノルタ株式会社 転写型複写機における転写紙分離装置
JPS5339237Y2 (enrdf_load_stackoverflow) * 1975-09-11 1978-09-22
JPS5327851U (enrdf_load_stackoverflow) * 1976-08-17 1978-03-09
JPS5713566Y2 (enrdf_load_stackoverflow) * 1977-04-30 1982-03-18
JPS638917Y2 (enrdf_load_stackoverflow) * 1980-11-12 1988-03-16
CN116986238B (zh) * 2023-09-26 2023-12-26 常州市水利规划设计院有限公司 一种水利工程用物料输送装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2323983A (en) * 1941-06-21 1943-07-13 United Biscuit Company Of Amer Doctor blade mechanism
US2544557A (en) * 1945-03-01 1951-03-06 Messrs Walmsleys Bury Ltd Oscillating doctor for paper machines
US3552850A (en) * 1968-02-01 1971-01-05 Xerox Corp Lubricated blade cleaning of imaging photoconductive members
US3634077A (en) * 1968-08-26 1972-01-11 Xerox Corp Method and apparatus for removing a residual image in an electrostatic copying system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2323983A (en) * 1941-06-21 1943-07-13 United Biscuit Company Of Amer Doctor blade mechanism
US2544557A (en) * 1945-03-01 1951-03-06 Messrs Walmsleys Bury Ltd Oscillating doctor for paper machines
US3552850A (en) * 1968-02-01 1971-01-05 Xerox Corp Lubricated blade cleaning of imaging photoconductive members
US3634077A (en) * 1968-08-26 1972-01-11 Xerox Corp Method and apparatus for removing a residual image in an electrostatic copying system

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927937A (en) * 1972-11-10 1975-12-23 Rank Xerox Ltd Cleaning assembly for an electrostatographic device
US4218131A (en) * 1975-01-17 1980-08-19 Canon Kabushiki Kaisha Cleaning device
US4323306A (en) * 1975-01-17 1982-04-06 Canon Kabushiki Kaisha Developer cleaning device for electrophotography
US4111545A (en) * 1975-02-06 1978-09-05 Xerox Corporation Vibrating blade cleaner
US4133073A (en) * 1976-04-14 1979-01-09 F.Lli Marzoli & C. S.P.A. Cleaning device for the scraper blades associated with rotating separation and/or clearing rollers for a textile fibre web in spinning machines
US4218132A (en) * 1977-12-20 1980-08-19 Konishiroku Photo Industry Co., Ltd. Drum cleaning apparatus for electrophotographic copying machine
US4522487A (en) * 1979-06-08 1985-06-11 Tokyo Shibaura Denki Kabushiki Kaisha Sealing device for electrostatic copying machine
US4400082A (en) * 1981-03-20 1983-08-23 Minolta Camera Kabushiki Kaisha Cleaning apparatus
US4509225A (en) * 1983-01-20 1985-04-09 Minnesota Mining And Manufacturing Company Pressure roll cleaning system
US4535883A (en) * 1983-03-09 1985-08-20 Material Control, Inc. Shock mount telescoping conveyor belt cleaner
US4533037A (en) * 1983-03-09 1985-08-06 Material Control, Inc. Telescoping conveyor belt cleaner
US4499827A (en) * 1983-03-22 1985-02-19 Dai Nippon Insatsu Kabushiki Kaisha System for automatically removing dust from plate cylinders of printing press
US4577955A (en) * 1983-11-18 1986-03-25 Ricoh Company, Ltd. Electrophotographic copying apparatus including a guillotine cleaner blade arrangement and method of operation
US4533035A (en) * 1984-01-04 1985-08-06 Material Control, Inc. Conveyor belt cleaner
DE3531581A1 (de) * 1984-09-06 1986-03-27 Sharp K.K., Osaka Reinigungsvorrichtung fuer elektrofotografische kopiergeraete
US4707115A (en) * 1986-08-28 1987-11-17 Xerox Corporation Device for cleaning a charging member
US4982239A (en) * 1987-08-07 1991-01-01 Canon Kabushiki Kaisha Image forming apparatus having reciprocating cleaning means
US5143555A (en) * 1990-02-21 1992-09-01 International Paper Company Travelling doctor blade
US5213040A (en) * 1991-12-03 1993-05-25 Toshiba Kikai Kabushiki Kaisha Automatic cleaning apparatus for gravure plate cylinders
US6463254B1 (en) 2001-05-09 2002-10-08 Lexmark International, Inc. Toner cleaner system vibrator and method
US20100150626A1 (en) * 2008-12-11 2010-06-17 Walter Kopp Cleaning arrangement for a moving element to be cleaned in an electrographic printing apparatus
US8340561B2 (en) * 2008-12-11 2012-12-25 OCé PRINTING SYSTEMS GMBH Cleaning arrangement for a moving element to be cleaned in an electrographic printing apparatus
DE102008061638B4 (de) * 2008-12-11 2017-02-23 Océ Printing Systems GmbH & Co. KG Reinigungsanordnung für ein bewegtes zu reinigendes Element bei einem elektrografischen Druckgerät
EP2950161A1 (en) * 2014-05-27 2015-12-02 KYOCERA Document Solutions Inc. Cleaning device
US11294322B2 (en) * 2018-09-17 2022-04-05 Hewlett-Packard Development Company, L.P. Cleaning of print apparatus components with rotation and oscillation

Also Published As

Publication number Publication date
CA991250A (en) 1976-06-15
BE789327A (fr) 1973-03-27
JPS4843342A (enrdf_load_stackoverflow) 1973-06-22
DE2243491A1 (de) 1973-04-05
FR2155320A5 (enrdf_load_stackoverflow) 1973-05-18
IT967796B (it) 1974-03-11
DE2243491B2 (de) 1976-06-24
NL7212330A (enrdf_load_stackoverflow) 1973-03-29
SE377202B (enrdf_load_stackoverflow) 1975-06-23
GB1403440A (en) 1975-08-28

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