US3843407A - Blade cleaning with reverse movement - Google Patents

Blade cleaning with reverse movement Download PDF

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Publication number
US3843407A
US3843407A US00391197A US39119773A US3843407A US 3843407 A US3843407 A US 3843407A US 00391197 A US00391197 A US 00391197A US 39119773 A US39119773 A US 39119773A US 3843407 A US3843407 A US 3843407A
Authority
US
United States
Prior art keywords
imaging surface
blade
cleaning
reversing
motion
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 - Lifetime
Application number
US00391197A
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English (en)
Inventor
B Thorp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Priority to US00391197A priority Critical patent/US3843407A/en
Priority to CA198,409A priority patent/CA1018244A/en
Priority to DE19742425682 priority patent/DE2425682A1/de
Priority to NL7409096A priority patent/NL7409096A/xx
Priority to JP1974092770U priority patent/JPS5438926Y2/ja
Priority to FR7428109A priority patent/FR2241813A1/fr
Priority to GB3639174A priority patent/GB1471343A/en
Application granted granted Critical
Publication of US3843407A publication Critical patent/US3843407A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • ABSTRACT F THE DISCLOSURE A method and apparatus for improving blade cleaning of an imaging surface in electrostatographic systems in which the imaging surface normally moves in only one direction, but intermittently stops, and is cleaned while it is moving in the normal direction by a contacting cleaning blade extending into the normal direction of movement of the imaging surface; comprising intermittently temporarily reversing the direction of movement of the imaging surface relative to this cleaning blade while maintaining the same contact of the cleaning blade with the imaging surface.
  • the intermittent reversing is done automatically in response to the intermittent stopstopping of the imaging surface.
  • the present invention relates to an improved apparatus and method for electrostatographic imaging surface cleaning by cleaning blades.
  • Exemplary xerographic blade type dry toner cleaning apparatus to which the present invention relates, is disclosed in U.S. Pats. Nos. 3,438,706, issued Apr. 15, 1969, to H. Tanaka et al.; 3,552,850, issued Jan. 5, 1971, to S. F. Royka et al.; 3,634,077, issued Jan. 11, 1972, to W. A. Sullivan; 3,660,863, issued May 9, 1972, to D. P. Gerbasi; 3,724,019, issued Apr. 3, 1973, to Alan L. Shanly; 3,724,020, issued Apr. 3, 1973, to Henry R. Till; and 3,740,789, issued June 26, 1973, to Raymond G. Ticknor. Pending applications of interest include U.S. applications Ser.
  • Toner cleaning systems with a polyurethene cleaning blade are commercially embodied in the Xerox Corporation 4000 and 3100 xerographic copiers.
  • the present invention is an improvement in this technology.
  • the single figure is a schematic perspective view of an exemplary electrostatographic blade cleaning system in accordance with the present invention.
  • an exemplary electrostatographic blade cleaning system 10 in accordance with the apparatus and method of the invention.
  • a rotatable photoreceptor drum 12 having the electrostatographic imaging surface 14 moving thereon.
  • the surface 14 is conventionally rotated in one direction during normal machine operations by a regular drum drive motor 16 through a conventional chain and sprocket drive connection to the drum 12 axis.
  • the drive motor 16 is powered by a conventional electrical power source 18 through the conventional machine controls and switches (not shown).
  • the normal direction of rotation of the drive motor 16 when it is being powered to drive the drum 12 is illustrated by the solid arrow 17 thereon.
  • the imaging surface 14 is shown being conventionally cleaned by a cleaning blade 20. It may be seen that the cleaning blade 20 is of the above-described scraping or chiseling type which contacts the imaging surface 14 at a cleaning edge 24 and extends toward the normal driven direction of motion of the surface 1'4, illustrated by the solid arrow 22. Thus, toner and any photoreceptor lubricant material on the imaging surface 14 will tend to accumulate on the cleaning edge 24 of the cleaning blade 20. This build-up of material can cause localized or total blade sealing failures, and, therefore, visible cleaning failures of the eventual copy.
  • the illustrated exemplary structure utilizes a reversing motor 26 which is intermitently connected to the photoreceptor drum 12 to reverse its direction when the imaging surface 14 is stopped by the removal of power to the drive motor '16.
  • This is accomplished here by having the reversing motor 26 mounted coaxially the shaft of the drive motor 16 adjacent its free end, i.e., opposite from the end which is connected to the drum sprocket drive.
  • a conventional normally disconnected (free-running) electrical clutch 28 is mounted between the reversing motor 26 and the main drive motor 16 so as to connect the two motors together only upon an electrical input to the electrical clutch 28.
  • This electrical input to the clutch 28 occurs here only upon actuation of a control switch 30. It may be seen that the switch 30 normally connects a first contact 31 to provide electrical power to the main drive motor 16 and prevent any power input to the electrical clutch 28. However, upon movement of the control switch 30 to a second contact 32, power is removed from the drive motor 1'6 so that the imaging surface 14 cornes to a stop. This connection to the second contact 32 also provides electrical power input to the electrical clutch 28, thereby connecting the reversing motor 26 to the shaft of the drive motor 16, and therebyrcausing the drive motor 16 to run in a reverse direction shown by the dashed line 34 thereon.
  • the reverse rotation of the drive motor 16 causes, through the same sprocket and chain drive connection normally used by the drive motor 16, the drum 12 to automatically reverse its direction of rotation and thereby change the direction of motion of the imaging surface 14 to the reverse direction illustrated by the dashed line 36.
  • the blade 20 thereby changes from a scraping to a wiping mode.
  • This reversal movement of the imaging surface 414 need not be long to achieve the desired results of breaking up or removal of build-up on the cleaning blade 20. Only a partial rotation in a reverse direction of the imaging surface is sufficient. A wiping action of the surface 14 against the blade of only one-quarter to one-half inch has been found sufficient to temporarily reseal cleaning blade defects causing toner streaking on copies.
  • This reversal movement is not required every time the imaging surface 14 is stopped. It may be provided only at intervals or periods determined by a number of machine stops or the like. However, it is preferred that the reversing occur automatically in response to the normal stopping of the imaging surface. Thereby there is no interruption of the normal machine operation.
  • any blade edge -tuckunders are relieved; secondly the thickness of the seal of toner and lubricant material at the blade edge can be reduced and made more uniform; and thirdly any contaminants present under the blade edge can be backed' out from beneath the blade.
  • the above embodiment provides the desired functions, steps and results of the invention with simple conventional apparatus and only aminor modification of an existing xerographic system.
  • Other suitable conventional apparatus which could be utilized to achieve the desired reverse rotation would be a conventional rotary solenoid, coupled to the drive motor 16 shaft, or a conventional slip clutch, or a conventional spring loaded over-running clutch which would be loaded in one direction with spring force by the normal rotation of the drive motor "16 shaft, and upon stopping of the drive motor 16 the stored spring force would act to rotate the motor 16 backwards for'a brief distance, thereby briefly rotating the imaging surface 14 backwards for a short distance,
  • the amount of reverse rotation can be Y limited, if desired, by a mechanical stop or by reducing the reversal spring loading in this case.
  • the solenoid or spring would provide the second or reversal driving force for such systems in place of a motor.
  • said reversing means includes additional drive means connected to said drive means and operative automatically to reverse the direction of movement of said drive means in response to said stopping of said imaging surface.
  • V 9 The method of Claim 8, wherein said imaging surface is normally fully rotated repeatedly in said one direction, and said intermittent reversing is for only a portion of a full rotation.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)
US00391197A 1973-08-24 1973-08-24 Blade cleaning with reverse movement Expired - Lifetime US3843407A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00391197A US3843407A (en) 1973-08-24 1973-08-24 Blade cleaning with reverse movement
CA198,409A CA1018244A (en) 1973-08-24 1974-04-29 Blade cleaning with reverse movement
DE19742425682 DE2425682A1 (de) 1973-08-24 1974-05-28 Verfahren und vorrichtung zum verbesserten reinigen einer abbildungsoberflaeche bei einem elektrostatografischen system mittels eines reinigungsblattes
NL7409096A NL7409096A (enrdf_load_stackoverflow) 1973-08-24 1974-07-04
JP1974092770U JPS5438926Y2 (enrdf_load_stackoverflow) 1973-08-24 1974-08-02
FR7428109A FR2241813A1 (enrdf_load_stackoverflow) 1973-08-24 1974-08-13
GB3639174A GB1471343A (en) 1973-08-24 1974-08-19 Blade cleaning with reverse movement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00391197A US3843407A (en) 1973-08-24 1973-08-24 Blade cleaning with reverse movement

Publications (1)

Publication Number Publication Date
US3843407A true US3843407A (en) 1974-10-22

Family

ID=23545657

Family Applications (1)

Application Number Title Priority Date Filing Date
US00391197A Expired - Lifetime US3843407A (en) 1973-08-24 1973-08-24 Blade cleaning with reverse movement

Country Status (7)

Country Link
US (1) US3843407A (enrdf_load_stackoverflow)
JP (1) JPS5438926Y2 (enrdf_load_stackoverflow)
CA (1) CA1018244A (enrdf_load_stackoverflow)
DE (1) DE2425682A1 (enrdf_load_stackoverflow)
FR (1) FR2241813A1 (enrdf_load_stackoverflow)
GB (1) GB1471343A (enrdf_load_stackoverflow)
NL (1) NL7409096A (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940282A (en) * 1973-06-29 1976-02-24 Xerox Corporation Blade cleaning of surfaces with reverse movement
US4076564A (en) * 1974-09-16 1978-02-28 Xerox Corporation Roughened imaging surface for cleaning
US4174172A (en) * 1976-12-17 1979-11-13 Xerox Corporation Cleaning methods and apparatus for a photocopying device
US4922305A (en) * 1989-09-14 1990-05-01 Xerox Corporation Apparatus for release of debris trapped between a blade and charge retentive surface
US5122839A (en) * 1991-04-22 1992-06-16 Xerox Corporation Dual action blade cleaner
US5239350A (en) * 1992-10-28 1993-08-24 Xerox Corporation Cleaning system failure detector
US5376990A (en) * 1993-01-04 1994-12-27 Xerox Corporation Method and apparatus for promoting uniform aging and extending photoconductor life
US5404200A (en) * 1993-06-22 1995-04-04 Xerox Corporation Method and apparatus for a self-recovering fuser and image receptor
WO1997012296A1 (en) * 1995-09-29 1997-04-03 Minnesota Mining And Manufacturing Company Apparatus and method for cleaning developer from an imaging substrate
US5713068A (en) * 1995-09-29 1998-01-27 Minnesota Mining And Manufacturing Company Apparatus and method for removing developer liquid from an imaging substrate
US5737673A (en) * 1995-09-29 1998-04-07 Minnesota Mining And Manufacturing Company Apparatus for removal of back-plated developer from a development device
US5754928A (en) * 1995-09-29 1998-05-19 Minnesota Mining And Manufacturing Company Squeegee apparatus and method for removing developer liquid from an imaging substrate
US5758236A (en) * 1995-09-29 1998-05-26 Minnesota Mining And Manufacturing Company Development apparatus for a liquid electrographic imaging system
US5802436A (en) * 1997-03-04 1998-09-01 Minnesota Mining And Manufacturing Company Apparatus for removal of back-plated developer from a development device
US5805963A (en) * 1995-09-29 1998-09-08 Minnesota Mining And Manufacturing Company Apparatus and method for removing developer liquid from an imaging substrate
US6091918A (en) * 1995-09-29 2000-07-18 Minnesota Mining And Manufacturing Company Squeegee apparatus and method for removing developer liquid from an imaging substrate
US6582769B2 (en) 2001-11-28 2003-06-24 Meadwestvaco Corporation Method for conditioning a metering blade
US20110150519A1 (en) * 2009-12-21 2011-06-23 Canon Kabushiki Kaisha Image forming apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5634917Y2 (enrdf_load_stackoverflow) * 1976-07-27 1981-08-17

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3438706A (en) * 1966-10-07 1969-04-15 Canon Kk Electrophotographic device

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940282A (en) * 1973-06-29 1976-02-24 Xerox Corporation Blade cleaning of surfaces with reverse movement
US4076564A (en) * 1974-09-16 1978-02-28 Xerox Corporation Roughened imaging surface for cleaning
US4174172A (en) * 1976-12-17 1979-11-13 Xerox Corporation Cleaning methods and apparatus for a photocopying device
US4922305A (en) * 1989-09-14 1990-05-01 Xerox Corporation Apparatus for release of debris trapped between a blade and charge retentive surface
US5122839A (en) * 1991-04-22 1992-06-16 Xerox Corporation Dual action blade cleaner
US5239350A (en) * 1992-10-28 1993-08-24 Xerox Corporation Cleaning system failure detector
US5376990A (en) * 1993-01-04 1994-12-27 Xerox Corporation Method and apparatus for promoting uniform aging and extending photoconductor life
US5404200A (en) * 1993-06-22 1995-04-04 Xerox Corporation Method and apparatus for a self-recovering fuser and image receptor
US5737673A (en) * 1995-09-29 1998-04-07 Minnesota Mining And Manufacturing Company Apparatus for removal of back-plated developer from a development device
US5713068A (en) * 1995-09-29 1998-01-27 Minnesota Mining And Manufacturing Company Apparatus and method for removing developer liquid from an imaging substrate
WO1997012296A1 (en) * 1995-09-29 1997-04-03 Minnesota Mining And Manufacturing Company Apparatus and method for cleaning developer from an imaging substrate
US5754928A (en) * 1995-09-29 1998-05-19 Minnesota Mining And Manufacturing Company Squeegee apparatus and method for removing developer liquid from an imaging substrate
US5758236A (en) * 1995-09-29 1998-05-26 Minnesota Mining And Manufacturing Company Development apparatus for a liquid electrographic imaging system
US5805963A (en) * 1995-09-29 1998-09-08 Minnesota Mining And Manufacturing Company Apparatus and method for removing developer liquid from an imaging substrate
US6091918A (en) * 1995-09-29 2000-07-18 Minnesota Mining And Manufacturing Company Squeegee apparatus and method for removing developer liquid from an imaging substrate
US5802436A (en) * 1997-03-04 1998-09-01 Minnesota Mining And Manufacturing Company Apparatus for removal of back-plated developer from a development device
US6582769B2 (en) 2001-11-28 2003-06-24 Meadwestvaco Corporation Method for conditioning a metering blade
US20110150519A1 (en) * 2009-12-21 2011-06-23 Canon Kabushiki Kaisha Image forming apparatus
US8718503B2 (en) * 2009-12-21 2014-05-06 Canon Kabushiki Kaisha Image forming apparatus
US20140286667A1 (en) * 2009-12-21 2014-09-25 Canon Kabushiki Kaisha Image forming apparatus
US9110433B2 (en) * 2009-12-21 2015-08-18 Canon Kabushiki Kaisha Image forming apparatus

Also Published As

Publication number Publication date
NL7409096A (enrdf_load_stackoverflow) 1974-09-25
GB1471343A (en) 1977-04-21
FR2241813A1 (enrdf_load_stackoverflow) 1975-03-21
DE2425682A1 (de) 1975-03-06
JPS5062537U (enrdf_load_stackoverflow) 1975-06-07
CA1018244A (en) 1977-09-27
JPS5438926Y2 (enrdf_load_stackoverflow) 1979-11-19

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