US3809012A - Developer seal - Google Patents

Developer seal Download PDF

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Publication number
US3809012A
US3809012A US00309386A US30938672A US3809012A US 3809012 A US3809012 A US 3809012A US 00309386 A US00309386 A US 00309386A US 30938672 A US30938672 A US 30938672A US 3809012 A US3809012 A US 3809012A
Authority
US
United States
Prior art keywords
imaging surface
developer
drum
seals
sealing strip
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
US00309386A
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English (en)
Inventor
G Delvecchio
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 US00309386A priority Critical patent/US3809012A/en
Priority to CA182,359A priority patent/CA984133A/en
Priority to NL7315272A priority patent/NL7315272A/xx
Priority to GB5423373A priority patent/GB1438704A/en
Priority to JP48132100A priority patent/JPS4989538A/ja
Application granted granted Critical
Publication of US3809012A publication Critical patent/US3809012A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03G15/0801—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer for cascading

Definitions

  • Delvecchio May 7, 1974 1 DEVELOPER SEAL 57 ABSTRACT [75] Inventor: George 1).
  • Delvecchlo Briscoe Cove, A developer housing f l rrophotographic apparatus in which a developer with carrier beads which [73] Assignee: X x C ti Stamford, roll over part of the photoreceptor surface is applied C to a photoreceptor drum inside a developer housing engaging the drum.
  • This developer housing side or end [22] Flled' 241972 seal which may be integrally molded of rubber or [21] Appl, No.; 309,386 other suitable materials, includes a multiplicity of overlapping resilient deflector vanes projecting in the direction of drum surface movement.
  • the present invention relates to an improved seal for electrostatographic apparatus, and more specifically to a seal providing improved retention of xerographic developer.
  • developer escape and machine contamination thereby are long-standing ones in the electrostatography art.
  • Developer which typically includes small carrier beads and very fine toner particles thereon, is very difficult to confine. In operation the developer typically must be dry and electrostatically attractable and carry electrical charges. It is subject to considerable movement and agitation within the machine since it is normally cascaded, magnetically brushed, sprayed or otherwise vigorously applied to an imaging surface to be developed with the developer.
  • the photoreceptor surface being developed is subjected to thousands of carrier beads being rolled and bounced over the photoreceptor surface at any given moment of time.
  • Many of these carrier beads acquire a lateral component of movement and therefor tend to roll out to one end (edge) or the other of the photoreceptor drum surface, where the side (end) seals of the developer housing abuts the drum surface.
  • the laterially moving carrier beads are continuously attempting to escape under the end seals of the developer housing.
  • developer material tends to build up or accumulate at these developer housing end seals to interfere with or deteriorate the seals and to encourage further developer escape by virtue of its build-up or entrapment adjacent to or under the seals.
  • FIG. 1 is an exploded perspective view of developer housing seals in accordance with the present invention, showing the seals in their position at each side of the developer housing, only pulled away from their normal engagement with the xerographic drum for clarity;
  • FIG. 2 is a top view of the exemplary apparatus of FIG. 1 showing the seals in operation against the photoreceptor surface;
  • FIG. 3 is an enlarged cross-sectional view of one seal of FIGS. 1 and 2, taken in a plane perpendicular the drum surface and along the drum axis;
  • FIG. 4 is a further cross-sectional view taken along the line 4-4 of FIG. 3;
  • FIG. 5 illustrates the seal of FIGS. 14 in an exemplary xerographic apparatus.
  • FIGS. 1-5 there is shown therein an exemplary pair of seals 10 in accordance with the present invention, together with related exemplary portions of an otherwise conventional xerographic apparatus 20,
  • the pair of seals 10 comprise an outboard seal 10a, viewed exteriorly in FIG. 1, and an inboard seal 1012, view interiorly in FIGS. 1 and 5.
  • the two seals 10a and 10b are substantially identical, here being allochiral or mirror images of one another. The detailed configuration of both of the seals 10a and 10b is best shown in the enlarged cross-sectional views of FIGS. 3 and 4.
  • Both of the seals 10a and 10b are each preferably cast or molded as an integral, unitary structure of Hypalon rubber (chlorosulfonated polyethylene) or other suitable commercially available resilient sealing material which is not deteriorated by the developer materials and which will closely engage the photoreceptor surface, and be slidable thereagainst.
  • the seals may be cast or formed in the desired a'rcuate segment configurations, or made linearly and/or continuously as by strip molding, and then cut to the desired length and curved during installation to the desired configuration. The latter method of construction is possible because of the fact that the seal may be provided, as shown, in a consistent, even, repetitive pattern along its elongate dimension.
  • pair of seals 1 is illustrated here as the edge seal of a xerographic developer housing, that the same seal configuration may also be utilized at other xerographic drum locations for sealing purposes. Further, while only one sealing strip is required at each side, as shown, it will be appreciated that it is possible to parallel the sealing strips with additional seals for increased sealing assurance. It will also be appreciated that while the seals R are disclosed here as held against the photoreceptor drum by the developer housing itself, that other or additional means may be utilized to hold the seals in sealing engagement with the drum surface. For example, various conventional tension or retension means.
  • the seals are shown as edge seals for a developer housing 12 which is in sealing engagement with a segment of an imaging surface, here comprising a xerographic photoreceptor drum 14.
  • the seals 10 here serve as the sole seal between the edges of the developer housing and the drum M to retain developer 16 within the developer housing 12.
  • Other suitable or conventional seals will, of course, be provided at the top and bottom edges of the developer housing, as for example the magnetic seals l8 schematically illustrated in FIG. 5.
  • the present seals 10 are particularly designed for side (end) seals. That is, they are designed to provide a seal along the edges of the moving imaging surface extending in the direction of movement of that surface.
  • Each of the seals 10a and 101) are elongate resilient sealing strips fastened to one edge of the developer housing 12 and extending therefrom toward, and into sealing engagement with, the surface of the drum 14. Both of the sealing strips extend in their elongate dimension in the direction of movement of the drum surface 14 along one edge of the drum. That is, the sealing strips are in a plane perpendicular the axis of rotation of the drum, and extend along the circumferiential surface thereof, at each outside edge of the drum.
  • the latteral dimension or width of the sealing strips 10 is quite small in comparison to the width of the imaging surface so as not to obstruct any substantial area thereof. However, a portion of the sealing strip does extend for a short distance onto the surface of the drum 14 within the developer housing I2 as will be explained further herein.
  • Both of these seals Wu and Itlb although preferably a unitary structure, may be considered for purposes of description herein as having two portions serving two different functions; a first or outer portion 22 and a second or inner portion 24.
  • the first portion 22 comprises a continuous, uniform and linear sealing member or blade, whose lower surface continuously slidably engages the surface of the drum I4 to provide a continuous seal therewith. (Note FIG. 3).
  • This first portion 22 of the seal also provides for suitable mounting means, such as the rivets illustrated in FIG. 1, along its upper edge for mounting the entire sealing strip projecting from the edges of the developer housing side walls.
  • the second portion 24 of the seals Mia and 10b comprises a multiplicity of spaced apart and continuously overlapping thin directional deflecting vanes or fins 26 inside of the first seal portion 22. It may be seen that each of the vanes 26 is independently resiliently cantilevered from the inside surface of the first portion 22 of the sealing strips. Each deflecting vane 26 extends angularly inwardly on the imaging surface away from the first portion 22, and also extends angularly in the direction of movement of the imaging surface. Thus, the vanes 26 overlie and extend into a small edge area of the imaging surface. The vanes are positioned edge-wise to the drum surface, and their bottom edges sealingly engage the drum surface.
  • the primary function of the deflecting vanes 26, comprising the second portion 24 of each seal 10, is to extend deflectingly into the path of any developer on the imaging surface which should attempt to approach the first portion 22 of the seals, to deflect such developer back toward the central portion of the imaging surface and to prevent it from approaching or accumulating adjacent the first portion 22 of the seals. Any carrier beads which would normally roll into engagement with, escape under, or contaminate the seals are resiliently deflected away from the seals by the vanes 26.
  • any carrier bead approaching the seal 10 will impact angularly with the side of at least one surface of the vanes 26 and be deflected inwardly of the drum thereby.
  • the sealing strips 10a and llOb located at opposite sides of the developer housing together form a distinctive herringbone pattern as viewed against the drum surface.
  • the multiplicity of vanes 26 have a configuration of uniform comb teeth which are angularly mounted. The angular disposition of the vanes 26 is not critical. A suitable configuration is illustrated here with the vanes 26 all extending linearly from the first portion 22 of the seal at approximately 45, forming an accute angle therewith opening in the direction of movement of the drum surface.
  • vanes 26 are in a continuous band of uniform width in the direction of motion of the drum surface, that they are mutually supportive and to an extent are inherently redundant. Some of the vanes 26 may be frictionally engaged by the drum 141 surface to the extent that they are deformed inwardly against the first portion 26 of the seal, yet the remaining undeflected vanes 26 will continue to extend into the same path and sweep that same edge area of the drum 14 adjacent the first portion 22 clear of developer.
  • an elongate resilient sealing strip fastened to at least one edge of said developer housing and extending in said elongate dimension in the direction of movement of said imaging surface along at least one edge of said imaging surface
  • sealing strip having a first portion in continuous linear sealing engagement with said imaging surface
  • said sealing strip having a second portion comprising a multiplicity of spaced apart and continuously overlapping directional deflecting vanes inside of said first portion
  • said deflecting vanes extending angularly inwardly on said imaging surface from said first portion and extending angularly in the direction of movement of said imaging surface, overlying a small edge area of said imaging surface, to extend deflectingly into the path of said developer on said imaging surface,
  • said multiplicity of deflecting vanes being positioned to continuously deflect developer away from said first portion of said sealing strip.
  • said imaging surface is a cylindrical drum photoreceptor and said seal ing strip is in the form of an arcuate segment of the circumference of said drum at one side of said drum.
  • one of said sealing strips are each located at opposite sides of said developer housing and said imaging surface, and together said opposing sealing strips form a herringbone pattern.
  • sealing strip including said vanes, is an integral unitary molding of rubber.
  • each of said vanes is independently resiliently cantalevered from said first portion of said sealing strip.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
US00309386A 1972-11-24 1972-11-24 Developer seal Expired - Lifetime US3809012A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00309386A US3809012A (en) 1972-11-24 1972-11-24 Developer seal
CA182,359A CA984133A (en) 1972-11-24 1973-09-28 Developer seal
NL7315272A NL7315272A (enrdf_load_stackoverflow) 1972-11-24 1973-11-07
GB5423373A GB1438704A (en) 1972-11-24 1973-11-22 Electrostatographic apparatus comprising a movable imaging
JP48132100A JPS4989538A (enrdf_load_stackoverflow) 1972-11-24 1973-11-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00309386A US3809012A (en) 1972-11-24 1972-11-24 Developer seal

Publications (1)

Publication Number Publication Date
US3809012A true US3809012A (en) 1974-05-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00309386A Expired - Lifetime US3809012A (en) 1972-11-24 1972-11-24 Developer seal

Country Status (5)

Country Link
US (1) US3809012A (enrdf_load_stackoverflow)
JP (1) JPS4989538A (enrdf_load_stackoverflow)
CA (1) CA984133A (enrdf_load_stackoverflow)
GB (1) GB1438704A (enrdf_load_stackoverflow)
NL (1) NL7315272A (enrdf_load_stackoverflow)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872826A (en) * 1973-10-23 1975-03-25 Xerox Corp Development system seal
US3906899A (en) * 1974-06-10 1975-09-23 Xerox Corp Developer seal
US4040386A (en) * 1975-05-01 1977-08-09 Xerox Corporation Retractable edge seals for electrostatographic development systems
US4071296A (en) * 1975-02-19 1978-01-31 Agfa-Gevaert, Ag Electrostatic-copier cleaning device
US4108111A (en) * 1977-05-31 1978-08-22 Xerox Corporation Developer housing
US4108112A (en) * 1977-05-31 1978-08-22 Xerox Corporation Developer housing
JPS5459943A (en) * 1977-10-21 1979-05-15 Canon Inc Developing device
US4168901A (en) * 1975-01-21 1979-09-25 Canon Kabushiki Kaisha Developer housing sealing device for electrophotography
US4394086A (en) * 1982-03-24 1983-07-19 Xerox Corporation Particle containment apparatus
US4431297A (en) * 1980-12-17 1984-02-14 Konishiroku Photo Industry Co., Ltd. Copying machine for electrophotography
US4516849A (en) * 1982-04-04 1985-05-14 Mita Industrial Co., Ltd. Cleaning device for an electrostatic photographic copying machine
US4571060A (en) * 1984-10-22 1986-02-18 Xerox Corporation Housing seal
US4575219A (en) * 1983-02-21 1986-03-11 Ricoh Company, Ltd. Dry process developing apparatus having detachable screening member for developing unit
US4575217A (en) * 1984-12-04 1986-03-11 Eastman Kodak Company Apparatus for selectively sealing a discrete dielectric sheet developer station
US4897693A (en) * 1986-12-29 1990-01-30 Ricoh Company, Ltd. Magnetic particle carrying apparatus
US5134960A (en) * 1989-05-31 1992-08-04 Canon Kabushiki Kaisha Toner seal for developing unit in process cartridge
US5138382A (en) * 1991-03-27 1992-08-11 Xerox Corporation Apparatus and method for creating a developer housing seal via a curtain of carrier beads
US5166733A (en) * 1992-01-30 1992-11-24 Xerox Corporation Blade and seal for preventing migration of toner particles from a developer roll in an electrophotographic printer
US5172166A (en) * 1990-07-09 1992-12-15 Sharp Kabushiki Kaisha Developing apparatus
US5563687A (en) * 1990-12-11 1996-10-08 Xerox Corporation Piezo-active photoreceptor and system application
US5987277A (en) * 1996-06-06 1999-11-16 Brother Kogyo Kabushiki Kaisha System for transferring toner to and from a photosensitive drum in a printing process unit
WO2002084409A1 (en) 2001-04-12 2002-10-24 Lexmark International, Inc. Dynamic end-seal for toner development unit
WO2003027774A1 (en) 2001-09-27 2003-04-03 Lexmark International, Inc. Dynamic end seal for image forming apparatus
US20070140729A1 (en) * 2005-12-15 2007-06-21 Carter James A Ii Dynamic seal for component surfaces
US20090154951A1 (en) * 2007-12-18 2009-06-18 Benjamin Alan Askren Developer Roll Lip Seal
US20090154950A1 (en) * 2007-12-18 2009-06-18 Benjamin Erich Kant Upper Seal for Inhibiting Doctor Blade Toner Leakage
US8644725B2 (en) 2011-05-18 2014-02-04 Lexmark International, Inc. Multiple stiffness seal for imaging component surfaces
CN104375403A (zh) * 2013-08-13 2015-02-25 京瓷办公信息系统株式会社 显影装置以及图像形成装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5815791B2 (ja) * 1975-04-07 1983-03-28 株式会社ケイアイピ− デンシフクシヤキニオケルゲンゾウソウチ
JPH0344688A (ja) * 1989-07-12 1991-02-26 Konica Corp トナーシール方法及び装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332328A (en) * 1965-03-01 1967-07-25 Xerox Corp Xerographic developer seal and process
US3424131A (en) * 1964-09-30 1969-01-28 Xerox Corp Electroded cascade development system
US3635196A (en) * 1969-12-30 1972-01-18 Xerox Corp Pneumatically controlled seal
US3640246A (en) * 1969-11-07 1972-02-08 Xerox Corp Development apparatus for latent electrostatic images

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424131A (en) * 1964-09-30 1969-01-28 Xerox Corp Electroded cascade development system
US3332328A (en) * 1965-03-01 1967-07-25 Xerox Corp Xerographic developer seal and process
US3640246A (en) * 1969-11-07 1972-02-08 Xerox Corp Development apparatus for latent electrostatic images
US3635196A (en) * 1969-12-30 1972-01-18 Xerox Corp Pneumatically controlled seal

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872826A (en) * 1973-10-23 1975-03-25 Xerox Corp Development system seal
US3906899A (en) * 1974-06-10 1975-09-23 Xerox Corp Developer seal
US4168901A (en) * 1975-01-21 1979-09-25 Canon Kabushiki Kaisha Developer housing sealing device for electrophotography
US4071296A (en) * 1975-02-19 1978-01-31 Agfa-Gevaert, Ag Electrostatic-copier cleaning device
US4040386A (en) * 1975-05-01 1977-08-09 Xerox Corporation Retractable edge seals for electrostatographic development systems
US4108111A (en) * 1977-05-31 1978-08-22 Xerox Corporation Developer housing
US4108112A (en) * 1977-05-31 1978-08-22 Xerox Corporation Developer housing
JPS5459943A (en) * 1977-10-21 1979-05-15 Canon Inc Developing device
US4431297A (en) * 1980-12-17 1984-02-14 Konishiroku Photo Industry Co., Ltd. Copying machine for electrophotography
US4394086A (en) * 1982-03-24 1983-07-19 Xerox Corporation Particle containment apparatus
US4516849A (en) * 1982-04-04 1985-05-14 Mita Industrial Co., Ltd. Cleaning device for an electrostatic photographic copying machine
US4575219A (en) * 1983-02-21 1986-03-11 Ricoh Company, Ltd. Dry process developing apparatus having detachable screening member for developing unit
US4571060A (en) * 1984-10-22 1986-02-18 Xerox Corporation Housing seal
US4575217A (en) * 1984-12-04 1986-03-11 Eastman Kodak Company Apparatus for selectively sealing a discrete dielectric sheet developer station
US4897693A (en) * 1986-12-29 1990-01-30 Ricoh Company, Ltd. Magnetic particle carrying apparatus
US5134960A (en) * 1989-05-31 1992-08-04 Canon Kabushiki Kaisha Toner seal for developing unit in process cartridge
US5172166A (en) * 1990-07-09 1992-12-15 Sharp Kabushiki Kaisha Developing apparatus
US5563687A (en) * 1990-12-11 1996-10-08 Xerox Corporation Piezo-active photoreceptor and system application
US5138382A (en) * 1991-03-27 1992-08-11 Xerox Corporation Apparatus and method for creating a developer housing seal via a curtain of carrier beads
US5166733A (en) * 1992-01-30 1992-11-24 Xerox Corporation Blade and seal for preventing migration of toner particles from a developer roll in an electrophotographic printer
US5987277A (en) * 1996-06-06 1999-11-16 Brother Kogyo Kabushiki Kaisha System for transferring toner to and from a photosensitive drum in a printing process unit
WO2002084409A1 (en) 2001-04-12 2002-10-24 Lexmark International, Inc. Dynamic end-seal for toner development unit
US6487383B2 (en) * 2001-04-12 2002-11-26 Lexmark International, Inc. Dynamic end-seal for toner development unit
CN100403180C (zh) * 2001-09-27 2008-07-16 莱克斯马克国际公司 用于成像装置的动态端封
WO2003027774A1 (en) 2001-09-27 2003-04-03 Lexmark International, Inc. Dynamic end seal for image forming apparatus
EP2216687A1 (en) * 2001-09-27 2010-08-11 Lexmark International, Inc. Dynamic end seal for image forming apparatus
US6553195B2 (en) * 2001-09-27 2003-04-22 Kurt Matthew Korfhage Dynamic end seal for image forming apparatus
US7623807B2 (en) 2005-12-15 2009-11-24 Lexmark International, Inc. Dynamic seal for component surfaces
WO2007075357A2 (en) 2005-12-15 2007-07-05 Lexmark International, Inc Dynamic seal for component surfaces
US20070140729A1 (en) * 2005-12-15 2007-06-21 Carter James A Ii Dynamic seal for component surfaces
EP1977287A4 (en) * 2005-12-15 2011-06-22 Lexmark International Inc Intellectual Property Law Dept DYNAMIC SEALING FOR COMPONENT SURFACES
US20090154951A1 (en) * 2007-12-18 2009-06-18 Benjamin Alan Askren Developer Roll Lip Seal
US20090154950A1 (en) * 2007-12-18 2009-06-18 Benjamin Erich Kant Upper Seal for Inhibiting Doctor Blade Toner Leakage
US8099012B2 (en) 2007-12-18 2012-01-17 Lexmark International, Inc. Developer roll lip seal
US8116657B2 (en) 2007-12-18 2012-02-14 Lexmark International, Inc. Upper seal for inhibiting doctor blade toner leakage
US8644725B2 (en) 2011-05-18 2014-02-04 Lexmark International, Inc. Multiple stiffness seal for imaging component surfaces
CN104375403A (zh) * 2013-08-13 2015-02-25 京瓷办公信息系统株式会社 显影装置以及图像形成装置
CN104375403B (zh) * 2013-08-13 2018-10-19 京瓷办公信息系统株式会社 显影装置以及图像形成装置

Also Published As

Publication number Publication date
GB1438704A (en) 1976-06-09
NL7315272A (enrdf_load_stackoverflow) 1974-01-25
CA984133A (en) 1976-02-24
JPS4989538A (enrdf_load_stackoverflow) 1974-08-27

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