US3842273A - Corona generator cleaning apparatus - Google Patents

Corona generator cleaning apparatus Download PDF

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Publication number
US3842273A
US3842273A US00380302A US38030273A US3842273A US 3842273 A US3842273 A US 3842273A US 00380302 A US00380302 A US 00380302A US 38030273 A US38030273 A US 38030273A US 3842273 A US3842273 A US 3842273A
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United States
Prior art keywords
wire
cleaning
shield
operative
edge
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
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US00380302A
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English (en)
Inventor
Buskirk W Van
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
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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 US00380302A priority Critical patent/US3842273A/en
Priority to CA198,603A priority patent/CA1028387A/en
Priority to DE19742424835 priority patent/DE2424835A1/de
Priority to SE7406925A priority patent/SE7406925L/
Priority to FR7423102A priority patent/FR2238175B1/fr
Priority to BE146417A priority patent/BE817485A/xx
Priority to AU71171/74A priority patent/AU7117174A/en
Priority to BR5813/74A priority patent/BR7405813D0/pt
Priority to NL7409632A priority patent/NL7409632A/xx
Priority to ES428358A priority patent/ES428358A1/es
Priority to IT7425274A priority patent/IT1017231B/it
Priority to GB3193274A priority patent/GB1458088A/en
Application granted granted Critical
Publication of US3842273A publication Critical patent/US3842273A/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
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0258—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices provided with means for the maintenance of the charging apparatus, e.g. cleaning devices, ozone removing devices G03G15/0225, G03G15/0291 takes precedence

Definitions

  • An improved apparatus for cleaning the discharge electrode or electrodes of a corona generating device.
  • the apparatus includes a cleaning element which is adapted to traverse the operative length of the electrode. An edge of the cleaning element engages the electrode to provide an effective scraping action on the surface thereof to clean the debris such as dust particles and toner particles therefrom.
  • the element cocks in operation to provide a first edge for scraping the electrode when the element is traversed in a first direction and a second edge for scraping the electrode when the element is traversed in an opposing direction.
  • the cleaning element also includes means for cleaning the shield of the corona generator.
  • An electrostatographic reproducing apparatus incorporating the aforenoted cleaning apparatus also forms part of the instant invention.
  • Corona generating devices are employed for a variety of purposes in electrostatographic reproducing machines including, for example, charging of the electrostatic imaging plate; electrostatic transfer of a developed image to an image receiving member; removal of background toner particles from a developed electrostatic latent image; and cleaning of the electrostatic imaging plate by neutralizing the charge on residual toner particles.
  • cornoa generating device is described in detail in U.S. Pat. No. 2,836,725 issued to Vyverberg. This device is usually comprised of at least one corona discharge electrode or coronode wire which is partially surrounded by a conductive shield.
  • this corona generating device is adapted to provide a uniform electrostatic charge on the desired surface, dust particles, toner particles, or other debris accummulating on or about the coronode wire and shield can cause non-uniform generation of corona current along the length of the coronode wire and may reduce the magnitude of the corona current generated.
  • a charging corona generator It is particularly desirable for a charging corona generator to deposit a uniform layer of electrostatic charges on the surface of the electrostatic imaging plate in order to provide high quality images.
  • Contaminated coronode wires provide non-uniform corona generation along their length and, therefore, non-uniform charge deposition on the imaging plate.
  • Thecreation of a corona current is predominately determined 'by the potential difference between the coronode wire and the shield.
  • Dust particles and toner particles which accumulate on the inner walls of the shield produce deleterious effects, particularly for a grounded metal shield.
  • These particles are comprised of dielectric material which can store the charged ions communicated thereto from the coronode wire.
  • a voltage is provided on the contaminated portion of the inner wall of the surrounding shield resulting in a non-uniform potential difference between the coronode wire and the shield with consequentvariations in corona discharge along the length of the corona generator.
  • This latter problem is particularly associated with corona generating devices employing a metallic shield.
  • a dielectric shield constructed, for example, of a plastic material such as Teflon or Mylar the accumulation of such particles on the shield has no appreciable effect on the corona generated current uniformity.
  • an improved apparatus for cleaning the discharge electrode of a corona generating device. Contrary to the approaches of the prior art in accordance with this invention the cleaning is accomplished by scraping the discharge electrodes.
  • the apparatus in accordance with this invention includes a cleaning element which is adapted to traverse the operative length of the electrode. An edge of this cleaning element engages the electrode to provide an effective scraping action on the surface of the electrode to clean debris such as dust particles and toner particles therefrom.
  • the element cocks in operation to provide a first edge for scraping the electrode when the element is traversed in a first direction and a second edge for scraping the electrode when the element is traversed in an opposing direction.
  • the cleaning element also includes means for cleaning the shield of the corona generator.
  • the discharge electrode preferably comprises a coronode wire. Due to the cocking action of the cleaning element the coronode wire is normally deflected so that it is biased into contact with the scraping edge of the cleaning element. Therefore, the cleaning element preferably is disengaged from the wire in the home position to allow the wire to assume its proper undeflected position.
  • FIG. 1 shows schematically an electrostatographic reproducing'machine in accordance with this invention.
  • FIG. 2 is a perspective view of a corona generator cleaning apparatus in accordance with this invention.
  • FIG. 3 is a partial cross-sectional view of the cleaning I
  • FIG. 5 is a partial cross-sectional view of the cleaning apparatus of this invention traversing in an opposing direction.
  • FIG. 6 is a perspective view of an alternative embodiment of a cleaning apparatus in accordance with this invention.
  • FIG. 7 is a bottom view of the device of FIG. 6 showing the cocking action.
  • FIG. 8 is a front view of a cleaning member in accordance with a preferred embodiment of this invention.
  • FIG. 1 there is shown by way of example an electrostatographic reproducing machine 1 which incorporates the improved corona generator cleaning apparatus 2 of the present invention.
  • the reproducing machine 1 depicted in FIG. 1 illustrates the various components utilized therein for xerographically producing copies from an original.
  • the cleaning apparatus of the present invention is particularly well adapted for use in an automatic xe rographic reproducing machine 1 it should become evident from the following description that it is equally well suited for use in a wide variety of electrostatographic systems and isnot necessarily limited in its application to the particular embodiment shown herein.
  • the reproducing machine illustrated in FIG. 1 employs an image recording drum-like member 10, the outer periphery of which is coated with a suitable photoconductive material 11.
  • a suitable photoconductive material is disclosed in U.S. Pat. No. 2,970,906, issued to Bixby in 1961.
  • the drum 10 is suitably journaled for rotation within a machine frame (not shown) by means of a shaft 12 and rotates in the direction indicated by arrow 13, to bring the image retaining surface thereon past a plurality of xerographic processing stations.
  • Suitable drive means (not shown) are provided to power and coordinate the motion of the various cooperating machine components whereby a faithful reproduction of the original input scene information is recorded upon a sheet 14 of final support material such as paper or the like.
  • FIG. 1 The various processing stations for producing a copy of an original are herein represented in FIG. 1 as blocks A to E.
  • the drum 10 moves photoconductive surface 11 through charging station A.
  • charging station A an electrostatic charge is placed uniformly over the photoconductive surface 11 of the drum 10 preparatory to imaging.
  • the charging may be provided by corona generating device of a type described in U.S. Pat. No. 2,836,725, issued to Vyverberg in 1958.
  • drum 10 is rotated to exposure station B where the charged photoconductive surface 11 is exposed to a light image of the original input scene information, whereby the charge is selectively dissipated in the light exposed regions to record the original input scene in the form of a latent electrostatic image.
  • a suitable exposure system may be of the type described in U.S. Pat. application, Ser, No. 259,181, filed June 2, 1972, or U.S. Pat. No. 3,330,181 issued to Jakobson in 1967.
  • drum 10 rotates the electrostatic latent image recorded on the photoconductive surface 11 to development station C wherein a conventional developer mix is applied to the photoconductive surface 11 of the drum l0 rendering the latent image visible.
  • a suitable development station is disclosed in U.S. Pat.
  • the developed image on the photoconductive surface 11 is then brought into contact with a sheet 14 of final support material within a transfer station D and the toner image is transferred from the photoconductive surace 11 to the contacting side of the final support sheet 14.
  • the final support material may be paper, plastic, etc., as desired.
  • the sheet with the image thereon is advanced to a suitable fuser 15 which coalesces the transferred powder image theretojOne type of suitable fuser is described in- U.S. Pat. No. 2,701,765, issued to Codichini, et al. in 1955.
  • the sheet 14 is advanced by rolls 16 to catch tray 17 for subsequent removal therefrom by the machine operator.
  • the residual toner particles remaining on the photoconductive surface 11 after the transfer operation are removed from the drum 10 as it moves through cleaning station E.
  • the residual toner particles are first brought under the influence of a cleaning corona generating device 18 adapted to neutralize the electrostatic charge remaining on the toner particles.
  • the neutralized toner particles are then mechanically cleaned from the photoconductive surface 11 by conventional means as, for example, the use of a resiliently biased knife blade asset forth in U.S. Pat. No. 3,660,863, issued to Gerbasi in 1972.
  • the sheets of final support material 14 processed in the automatic xerographic reproducing machine will be stored in the machine within a removable paper cassette 19.
  • a suitable paper cassette as set forth in U.S. Pat. application, Ser. No. 208,138 field Dec. 15, 1971.
  • the copier in accordance with this invention can also have the capability of accepting and processing copying sheets of varying lengths.
  • the length of the copy sheet of course, being dictated by the size of the original input scene information, recorded on the photoconductive surface 11.
  • the paper cassette 19 is preferably provided with an adjustable feature whereby sheets of varying length and width can be conveniently accommodated therein.
  • the cassette 19 is filled with a stack of final support material of preselected size and the cassette 19 is inserted into the machine in operable relationship with a pair of feed rolls 20.
  • the top most sheet 21 of the stack is separated and forwarded from the stack into the transfer station D by means of registration rolls 22.
  • the corona generator shown in FIG. 2 comprises the charging corona generator A of the apparatus 1 of FIG. 1.
  • Thegenerator 30 comprises a partially surrounding shield 31 and a coronode wire 32.
  • the coronode wire 32 acts as a corona discharge electrode. While only one discharge electrode is shown, the corona generator may have any desired number of electrodes.
  • the shield 31 is formed of metal and is connected to ground potential.
  • the coronode wire 32 is connected to a suitable source ofhigh voltage (not shown) by means of wire 33.
  • the wire 32 in the embodiment shown is stationary and is supported at both of its ends by means of clamps 34.
  • the wire 32 is held taut between the clamps 34 so that it is uniformly positioned at a proper distance from the photoconductive surface 11.,As previously noted, the environment in an electrostatographic reproducing machine is not sufficiently clean to maintain the shield 31 and coronode wire 32 free from contamination by dust particles, toner particles or other debris.
  • a slot 35 is provided in the back portion 36 of the shield 31 to provide for communication with a cleaning means 37.
  • the cleaning means 37 is positioned within the shield 31 and about the coronode wire 32 so that it can be traversed along the operative length of the wire and shield.
  • the cleaning means is operative to clean the coronode wire 32 and preferably also the shield 31.
  • the cleaning means 37 in accordance with this invention comprises a movable member 38 or cleaning element having a body portion 39 with a slot 40 therein so that the element may be fit about the coronode wire 32.
  • Two legs 41 project outwardly from the body portion 39 in parallel alignment on either side of the slot 40.
  • a carriage member 42 having a slot 43 therein adapted to pivotably receive the legs 41 of the element 38 is provided which is adapted to shuttle back and forth in substantial axial alignment with the coronode wire 32.
  • the legs 41 of the cleaning element 38 are preferably pivotably secured within the slot 43 of the carriage member 42 by means of pin 44 so that the cleaning element may cockin one or the other directions of travel.
  • the legs 41 of the cleaning element 38 protrude through the slot 35 in the back of the shield 31.
  • the slot 35 is in axial alignment with the wire 32 and is operative to guide the cleaning element 38 along the wire.
  • the cleaning element 38 is driven to and fro along the wire 32 by means of a cable drive 50.
  • the cable drive comprises a first cable portion 51 connected between a first tab 52 of the carriage member 42 and an automatic return means 53 via pulley 54.
  • the return means 53 preferably comprises a spring loaded rewind mechanism of conventional design.
  • A. second cable portion 55 is provided which is connected via pulley 56 between a second tab 57 of the carriage member 42 and a means 58 for actuating the cleaning means 37.
  • the actuation means 58 shown in FIG. 2 comprises a knob which permits the operator to manually pull on the cable 55 to thereby cause the cleaning means 37 to traverse the wire 32 and shield 31 in a first direction over the operative lengths thereof.
  • the cleaning means 37 Upon releasing the knob 58 the cleaning means 37 is caused to traverse the wire 32 and shield 31 in the opposing direction automatically by operation of the spring biased rewind mechanism 53.
  • the length of the slot 35 governs the distance over which the cleaning means 37 may be traversed.
  • the length which is employed is at least as great and preferably greater than the operative length of the wire 32 and shield 31.
  • the cleaning element 38 shown in FIG. 2 includes a means 60 for cleaning the inside portion 61 of the shield 31.
  • the cleaning means 60 preferably comprises brushes formed of any desired material and having any desired structure such as, for example, fiberous or foam-like.
  • One particularly useful material is sold under the trademark Velcro by the l-Ieartwell Corporation, 9035 Dennis Boulevard, Los Angeles, Calif.
  • This material consists of loop-type fibers 62 as better shown in FIG. 8, which are formed of a material such as nylon.
  • This type of brush 60 has proved to be highly effective since the fibers 62 have increased stiffness by virture of their looped nature.
  • the shield 31 as shown in FIG. 2 has a structure designed to provide improved strength in consideration of the slot 35 which is provided in it.
  • the shield 31 preferably comprises a member of rectalinear cross-section having a channel defined by surface 61 of substantially hemospherical cross-section formed therein.
  • FIG. 3 shows the cleaning apparatus 2 in the home position H.
  • the home position as the term is employed in accordance with this invention, comprises the starting position or rest position for the cleaning element 38 when it is not actuated.
  • the home position of the shield 32 is provided with ramps which contact the shoulders 71 (FIG. 8) of the cleaning element 38 to force the element out of engagement with the coronode wire 32. It is desirable to maintain the distance between the wire 32 and the photoreceptive surface 11 substantially constant along the length of the wire, and, therefore, when the cleaning apparatus 2 is not in use it should be disengaged from the wire so as to avoid any deflection thereof.
  • the carriage 42 and cleaning element 58 are caused to traverse the coronode wire 32 in a first direction as shown by arrow in FIG. 4 toward the end of travel position 73 of the slot 35. Since the cleaning element 38 is pivoted in the carriage 42, it cocks away from the direction of travel during traverse so that at least one first edge 81 of the cleaning element is caused to engage the wire 32 and scrape its surface clean of any contaminants.
  • the engagement provided in accordance with this invention is unique as compared to the prior art devices in that an edge of the cleaning member is caused to scrape rather than just wipe the wire to remove contaminants.
  • an effective cleaning apparatus 2 which comprises an element 38 having at least one edge 81 which is operative to scrape the wire 32 to remove contaminants therefrom.
  • the cleaning element 38 traverses the wire 32 until it reaches its end of travel position 73 which is near the end of the wire 32 and outside the operable zone of the wire. At this time the knob 58 is released and the cleaning element is caused to traverse the wire 32 in the opposing direction as shown by arrow 82 in FIG. 5 back towards the home position H under the action of the spring rewind mechanism 53. Upon changing directions the cleaning element 38 cocks longitudinally away from the direction of travel so that at least one second edge 83 is caused to engage the wire 32.
  • the cleaning element 38 engage the wire 32 so as to deflect it and thereby be biased against it during the cleaning operation as shown in FIGS. 4 and 5.
  • the slot 40 width is selected to provide the best scraping action for the largest portion of the cir' cumference of the wire 32. Therefore, the slot 40 size is selected such that the width of the slot is about the same as the diameter of the wire 32. Preferably the width of the slot is within about +0.000 inch and 0.005 inch of the diameter of the wire 32.
  • the bottom of the slot 40 as shown in FIG. 8 preferably conforms to the shape of the wire 32 which in the embodiment shown is circular.
  • the rest position of the wire is shown as the dashed line ,R in FIGS. 4 and 5.
  • the amount of deflection shown is exaggerated for purposes of illustration.
  • the actual deflection of the wire would generally be less than about 0.060 inch and preferably less than about 0.025 inch.
  • the slot width may be set as desired.
  • the preferred slot 40 width provides for the optimum cleaning action for the greatest portion of the circumference of the wire.
  • the edges 81 and 83 are effective to clean this latter surface irrespective of the slot 40 width. This latter approach also would provide less wear on the wire due to cleaning.
  • the preferred approach provides the best cleaning, and, therefore, the most uniform charge distribution from the cleaned wire.
  • the shield cleaning means 60 is effective to wipe the shield 31 clean during both the initial traverse and the return traverse of the cleaning element 38.
  • FIGS. 6 and 7 there is shown an alternative embodiment of this invention wherein the carriage 42' is connected to the cables 51 and 55 at points 52' and 57 spaced apart transverse to the direction of travel and the wire 32 axis such that the cleaning element 38 is caused to be cocked transverse to the direction of travel and the wire axis.
  • This cocking action may be provided in place of the previously described action with reference to FIGS. 4 and 5 by rigidly mounting the cleaning element 38 to the carriage 42' or alternatively a combination of cocking actions both in the transverse and longitudinal directions with reference to the wire 32 axis and the direction of travel may be provided by allowing the cleaning element 38 to pivot in the carriage 42 as shown.
  • the carriage 42' includes the slot 43' which is adapted to receive the legs 41 of the cleaning element 38.
  • the legs 41 are pivotably secured within the slot 43' by means of the pin 44'.
  • the corona generator 30 shown in FIG. 6 is a partial view of the one shown in FIG. 2 and the means 58 for actuating the cleaning means 37 and the means 53 for returning the cleaning means to its home position would be arranged substantially as set forth in FIG. 2.
  • FIG. 7 the transverse cocking action of the cleaning element 38 of FIG. 6 is illustrated.
  • the cleaning element 38 By cocking the cleaning element 38 transverse to the axis of the wire 32 at least a first pair of edges and 91 are caused to scrapingly engage the wire during its initial traverse.
  • at least a second pair of edges 92 and 93 are urged into scraping engagement'with the wire 32.
  • the wire 32 is deflected laterally in different directions on the opposing sides 94 and 95 of the cleaning element 38. It should be recognized that this type of transverse cocking action would provide an effective cleaning action by providing more than one edge 90 and 91 or 92 and 93 to scrapingly engage the wire 32.
  • the cleaning means 37 also includes brushes 60 adapted to clean the shield 31.
  • the body 39 of the cleaning element 38 includes two slots which serve to define two arms 101 for supporting the brushes 60 which is adapted to clean the shield 31.
  • the arms 101 serve to act as cantilevers to increase the bias between the brushes and the shield and thereby provide improved cleaning of the shield 31.
  • the cleaning element 38, the brushes 60, the carriage 42, the pin 44, the pulleys 54 and 56, and the cables 51 and 55 are all constructed of non-conductive materials such as, for example, nylon, which will not breakdown at the potentials employed for corona generation.
  • scraping refers to the removal of material from the surface of the discharge electrode by stroking with an edged element as described above.
  • the material which forms the edge should preferably be relatively hard, as for example, have a hardness of about 80 Shore A durometer.
  • the scraping action described herein is distinguishable from the wiping action of prior art devices since wiping comprises rubbing with a relatively soft material rather than stroking with a relatively hard edged element.
  • electrostatography refers to the formation and utilization of electrostatic charge patterns for the purpose of recording and reproducing patterns in viewable form.
  • Electrostatography specifically includes, while not being limited to, electrography wherein an insulating medium is employed to form without the aid of electromagnetic radiation latent electrostatic charge patterns for producing a viewable record and electrophotography which employs a photoresponsive medium to form with the aid of electromagnetic radiation, latent electrostatic charge patterns for producing a viewable record.
  • a cleaning apparatus for a corona generating device comprising at least one stationary discharge electrode wire and means for cleaning said wire, the improvement wherein said cleaning means comprises: an element having at least one edge which is operative to deflect and scrape said wire to remove contamination therefrom, means for traversing said element in operative engagement along said wire between a home position and an end of travel position and means for disengaging said edge from said wire at said home position.
  • An apparatus as in claim 1 further including a partially surrounding shield about said electrode wire and means associated with said cleaning means for cleaning the interior of said shield.
  • a cleaning apparatus for a corona generating device comprising at least one stationary discharge electrode wire and means for cleaning said wire, the improvement wherein said cleaning means comprises an element which is operative to deflect and scrape said wire to remove contaminants therefrom, means for traversing said element in operative engagement with said wire in a first direction and in an opposing direction, and means for cocking said element in a given direction with respect to said wire during traverse in said first direction to provide at least one first edge which is operative to engage and scrape said at least one wire and means for cocking said element in a direction opposed to said given direction during traverse in said opposing direction to provide at least one second edge which is operative to engage and scrape said at least one wire.
  • traversing means comprises means for actuating said element to traverse it in said first direction to said end of travel position and means for automatically returning said element to said home position when traversing said element in said opposing direction.
  • An apparatus as in claim 7 further including a partially surrounding shield about said electrode and means associated with said cleaning means for cleaning the interior of said shield.
  • said element includes: a body portion adapted to be positioned within the interior of said shield, a slot provided in said body portion adapted to receive said wire, legs attached to said body portion on either side of said slot, and wherein a slot is provided in said shield through which said legs can protrude, said apparatus further including a carriage member adapted to pivotably receive said legs of said cleaning element, said legs being pivotably engaged to said carriage and wherein said traversing means drives carriage in said first direction and in said opposing direction.
  • said traversing means includes a first cable portion connected between said carriage member and said return means and a second cable portion connected between said carriage member and said actuating means.
  • said means for cleaning said shield comprises brushes and wherein said brushes comprise a plurality of loop-type fibers extending outwardly from said cleaning element and operative to engage the interior of said shield.
  • said cleaning element further includes arms on opposing sides of said slot which are adapted to support brushes for cleaning said shield in a cantilever fashion whereby said brushes are resiliently engaged against said shield.
  • an electrostatographic reproducing apparatus including: an electrostatic imaging member, means for forming an electrostatic image on said member, means for developing said electrostatic image, and at least one corona generating device comprising at least one stationary discharge electrode wire and means for cleaning said wire, the improvement wherein said cleaning means comprises: an element having at least one edge which is operative to deflect and scrape said wire to remove contamination therefrom, means for traversing said element in operative engagement along said wire between a home position and an end of travel position and means for disengaging said edge from said wire at said home position.
  • An apparatus as in claim 17 further including a partially surrounding shield about said electrode and means associated with said cleaning means for cleaning the interior of said shield.
  • an electrostatic reproducing apparatus including: an electrostatic imaging member, means for forming an electrostatic image on said member, means for developing said electrostatic image, and at least one corona generating device comprising at least one discharge electrode wire and means for cleaning said discharge electrode, the improvement wherein said cleaning means comprises: an element which is operative to deflect and scrape said wire to remove contaminants therefrom, means for traversing said element in operative engagement with said wire in a first direction and in an opposing direction and means for cocking said element in a given direction with respect to said wire during traverse in said first direction to provide at least one first edge which is operative to engage and scrape said at least one wire and means for cocking said element in a direction opposed to said given direction during traverse in said opposing direction to provide at least one second edge which is operative to engage and scrape said at least one wire.
  • traversing means comprises means for actuating said element to traverse it in said first direction to said end of travel position and means for automatically returning said element to said home position when traversing said element in said opposing direction.
  • An apparatus as in claim 20 further including a partially surrounding shield about said electrode and means associated with said cleaning means for cleaning the interior of said shield.
  • traversing means comprises means for actuating said element to traverse it in a first direction to said end of travel position and means for automatically returning said element to said home position when traversing said element in an opposing direction to said home position.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
US00380302A 1973-07-18 1973-07-18 Corona generator cleaning apparatus Expired - Lifetime US3842273A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US00380302A US3842273A (en) 1973-07-18 1973-07-18 Corona generator cleaning apparatus
CA198,603A CA1028387A (en) 1973-07-18 1974-04-25 Corona generator cleaning apparatus
DE19742424835 DE2424835A1 (de) 1973-07-18 1974-05-22 Koronagenerator-reinigungsvorrichtung
SE7406925A SE7406925L (enrdf_load_stackoverflow) 1973-07-18 1974-05-24
FR7423102A FR2238175B1 (enrdf_load_stackoverflow) 1973-07-18 1974-07-03
BE146417A BE817485A (fr) 1973-07-18 1974-07-10 Appareil pour le nettoyage du generateur d'effet corona pour machine electrostatigraphique de reproduction de documents
AU71171/74A AU7117174A (en) 1973-07-18 1974-07-12 Cleaning apparatus
BR5813/74A BR7405813D0 (pt) 1973-07-18 1974-07-15 Aparelho aperfeicoado de limpeza para dispositivo gerador de efeito coroa
NL7409632A NL7409632A (enrdf_load_stackoverflow) 1973-07-18 1974-07-16
ES428358A ES428358A1 (es) 1973-07-18 1974-07-17 Aparato de limpieza para dispositivo generador de efecto corona.
IT7425274A IT1017231B (it) 1973-07-18 1974-07-17 Apparecchiatura particolarmente per la pulitura dell elettrodo o degli elettrodi di un dispositivo a scarica corona per macchine elettrostatografiche
GB3193274A GB1458088A (en) 1973-07-18 1974-07-18 Corona generator cleaning apparatus

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Application Number Priority Date Filing Date Title
US00380302A US3842273A (en) 1973-07-18 1973-07-18 Corona generator cleaning apparatus

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US3842273A true US3842273A (en) 1974-10-15

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US00380302A Expired - Lifetime US3842273A (en) 1973-07-18 1973-07-18 Corona generator cleaning apparatus

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US (1) US3842273A (enrdf_load_stackoverflow)
AU (1) AU7117174A (enrdf_load_stackoverflow)
BE (1) BE817485A (enrdf_load_stackoverflow)
BR (1) BR7405813D0 (enrdf_load_stackoverflow)
CA (1) CA1028387A (enrdf_load_stackoverflow)
DE (1) DE2424835A1 (enrdf_load_stackoverflow)
ES (1) ES428358A1 (enrdf_load_stackoverflow)
FR (1) FR2238175B1 (enrdf_load_stackoverflow)
GB (1) GB1458088A (enrdf_load_stackoverflow)
IT (1) IT1017231B (enrdf_load_stackoverflow)
NL (1) NL7409632A (enrdf_load_stackoverflow)
SE (1) SE7406925L (enrdf_load_stackoverflow)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3958877A (en) * 1975-04-10 1976-05-25 Xerox Corporation Half-tone screen with cleaning means for an electrophotographic printing machine
US3961848A (en) * 1975-04-11 1976-06-08 Xerox Corporation Electrophotographic printing machine with halftone screen cleaning
US3965400A (en) * 1975-02-24 1976-06-22 Xerox Corporation Corona generating device with improved built-in cleaning mechanism
US3978379A (en) * 1974-11-20 1976-08-31 Xerox Corporation Corona generating device with an improved cleaning mechanism
US4038546A (en) * 1976-05-03 1977-07-26 Xerox Corporation Cleaning apparatus for a corona generating device
US4516848A (en) * 1982-03-05 1985-05-14 Tdk Corporation Charging device for an electrostatic copying machine
US4575329A (en) * 1984-01-09 1986-03-11 Andreas Ahlbrandt Electrode element for corona treater
EP0224820A1 (de) * 1985-11-25 1987-06-10 Siemens Aktiengesellschaft Corotrondrahtkassette für elektrofotografische Druck- oder Kopiergeräte
US4711564A (en) * 1985-12-03 1987-12-08 Siemens Aktiengesellschaft Mechanism for the drive of actuation elements movable in sealed regions of non-mechanical printer or copier means
US4788573A (en) * 1984-05-24 1988-11-29 Canon Kabushiki Kaisha Image forming apparatus
US4885466A (en) * 1987-09-25 1989-12-05 Ricoh Company, Ltd. Corona wire cleaning device utilizing a position detection system
US4908513A (en) * 1987-09-25 1990-03-13 Konica Corporation Charging apparatus
EP0365345A3 (en) * 1988-10-21 1991-03-13 Mita Industrial Co., Ltd. A corona wire cleaning device for a corona unit
US5012093A (en) * 1988-08-29 1991-04-30 Minolta Camera Co., Ltd. Cleaning device for wire electrode of corona discharger
US5089850A (en) * 1986-05-16 1992-02-18 Sharp Kabushiki Kaisha Image forming unit with a charger wire and optics cleaning mechanism
US5146269A (en) * 1989-06-23 1992-09-08 Minolta Camera Kabushiki Kaisha Image forming apparatus having self-diagnostic function
US5223896A (en) * 1989-06-23 1993-06-29 Minolta Camera Kabushiki Kaisha Image forming apparatus having self-diagnostic function relating to the potential of the photoreceptor
US5250991A (en) * 1991-05-24 1993-10-05 Canon Kabushiki Kaisha Image forming apparatus including cleaning means for cleaning charging means
US5392099A (en) * 1992-09-25 1995-02-21 Mita Industrial Co., Ltd. Image forming apparatus having cleaning member for cleaning charging wire
US5436713A (en) * 1993-08-20 1995-07-25 Xerox Corporation Apparatus for removing residual developer material from a surface of a printing machine
US5485251A (en) * 1993-09-06 1996-01-16 Mita Industrial Co., Ltd. Cleaning device for an electrostatic charger
US5594532A (en) * 1995-03-15 1997-01-14 Dataproducts Corporation Cartridge, cartridge cleaning apparatus and method for cleaning a corona wire
US5687054A (en) * 1996-03-08 1997-11-11 Konica Corporation Corona charging apparatus
US5697019A (en) * 1994-12-27 1997-12-09 Samsung Electronics Co., Ltd. Cleaning device of corona charging unit in image forming apparatus
US20030180065A1 (en) * 2001-02-28 2003-09-25 Walgrove George R. Mechanism and method for cleaning corona wires
US20050207778A1 (en) * 2004-03-17 2005-09-22 Kabushiki Kaisha Toshiba Charger and image forming apparatus
US7043176B1 (en) 2002-09-26 2006-05-09 Eastman Kodak Company Apparatus and method for damping a corona wire in an electrographic printer
US20070065173A1 (en) * 2005-09-16 2007-03-22 Xerox Corporation Cleaning system for a charging device in a xerographic printer
US20070151455A1 (en) * 2005-07-06 2007-07-05 Gates Peter J Cleaning device
US20080260417A1 (en) * 2007-04-20 2008-10-23 Kyocera Mita Corporation Charging device and image forming apparatus having the same
US20110274459A1 (en) * 2010-05-07 2011-11-10 Toshiba Tec Kabushiki Kaisha Image forming apparatus, charging apparatus and cleaning method of charging apparatus

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DE2706599C2 (de) * 1977-02-16 1982-12-23 Siemens AG, 1000 Berlin und 8000 München Reinigungseinrichtung für einen Zwischenträger bei einem nach dem elektrostatischen Prinzip arbeitenden Druck- oder Kopiergerät
DE3116421C2 (de) * 1981-04-24 1983-03-31 Siemens AG, 1000 Berlin und 8000 München Anordnung zur Steuerung der Reinigungseinrichtungen in einem nichtmechanischen Druck- oder Kopiergerät
US4566777A (en) * 1982-08-23 1986-01-28 Canon Kabushiki Kaisha Process kit for image forming apparatus
GB2231842B (en) * 1986-05-16 1991-05-01 Sharp Kk Electrographic image recording apparatus
US5170314A (en) * 1989-02-03 1992-12-08 Konica Corporation Charging apparatus

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US2614901A (en) * 1949-08-04 1952-10-21 Carlyle W Jacob Recording head for facsimile reproduction and the like
US2725304A (en) * 1951-08-31 1955-11-29 Haloid Co Process for developing an electrostatic latent image
US2811135A (en) * 1954-12-29 1957-10-29 Haloid Co Powder charging device
US3339069A (en) * 1964-10-14 1967-08-29 Xerox Corp Corona charging device with means to prevent toner dust contamination
US3471695A (en) * 1967-05-22 1969-10-07 Xerox Corp Corona charging apparatus with means to urge a flow of aeriform fluid across the corona wires
US3496352A (en) * 1967-06-05 1970-02-17 Xerox Corp Self-cleaning corona generating apparatus
US3499143A (en) * 1968-05-21 1970-03-03 Pitney Bowes Inc Electrostatic charger with resuppliable corona wire

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978379A (en) * 1974-11-20 1976-08-31 Xerox Corporation Corona generating device with an improved cleaning mechanism
US3965400A (en) * 1975-02-24 1976-06-22 Xerox Corporation Corona generating device with improved built-in cleaning mechanism
US3958877A (en) * 1975-04-10 1976-05-25 Xerox Corporation Half-tone screen with cleaning means for an electrophotographic printing machine
US3961848A (en) * 1975-04-11 1976-06-08 Xerox Corporation Electrophotographic printing machine with halftone screen cleaning
US4038546A (en) * 1976-05-03 1977-07-26 Xerox Corporation Cleaning apparatus for a corona generating device
US4516848A (en) * 1982-03-05 1985-05-14 Tdk Corporation Charging device for an electrostatic copying machine
US4575329A (en) * 1984-01-09 1986-03-11 Andreas Ahlbrandt Electrode element for corona treater
US4788573A (en) * 1984-05-24 1988-11-29 Canon Kabushiki Kaisha Image forming apparatus
EP0224820A1 (de) * 1985-11-25 1987-06-10 Siemens Aktiengesellschaft Corotrondrahtkassette für elektrofotografische Druck- oder Kopiergeräte
US4746796A (en) * 1985-11-25 1988-05-24 Siemens Aktiengesellschaft Corotron wire cassette for electrophotographic printer or copier devices
US4711564A (en) * 1985-12-03 1987-12-08 Siemens Aktiengesellschaft Mechanism for the drive of actuation elements movable in sealed regions of non-mechanical printer or copier means
US5089850A (en) * 1986-05-16 1992-02-18 Sharp Kabushiki Kaisha Image forming unit with a charger wire and optics cleaning mechanism
US4885466A (en) * 1987-09-25 1989-12-05 Ricoh Company, Ltd. Corona wire cleaning device utilizing a position detection system
US4908513A (en) * 1987-09-25 1990-03-13 Konica Corporation Charging apparatus
US5012093A (en) * 1988-08-29 1991-04-30 Minolta Camera Co., Ltd. Cleaning device for wire electrode of corona discharger
EP0365345A3 (en) * 1988-10-21 1991-03-13 Mita Industrial Co., Ltd. A corona wire cleaning device for a corona unit
US5023748A (en) * 1988-10-21 1991-06-11 Mita Industrial Co., Ltd. Corona wire cleaning device for a corona unit
US5223896A (en) * 1989-06-23 1993-06-29 Minolta Camera Kabushiki Kaisha Image forming apparatus having self-diagnostic function relating to the potential of the photoreceptor
US5146269A (en) * 1989-06-23 1992-09-08 Minolta Camera Kabushiki Kaisha Image forming apparatus having self-diagnostic function
US5250991A (en) * 1991-05-24 1993-10-05 Canon Kabushiki Kaisha Image forming apparatus including cleaning means for cleaning charging means
US5392099A (en) * 1992-09-25 1995-02-21 Mita Industrial Co., Ltd. Image forming apparatus having cleaning member for cleaning charging wire
US5436713A (en) * 1993-08-20 1995-07-25 Xerox Corporation Apparatus for removing residual developer material from a surface of a printing machine
US5485251A (en) * 1993-09-06 1996-01-16 Mita Industrial Co., Ltd. Cleaning device for an electrostatic charger
US5697019A (en) * 1994-12-27 1997-12-09 Samsung Electronics Co., Ltd. Cleaning device of corona charging unit in image forming apparatus
US5594532A (en) * 1995-03-15 1997-01-14 Dataproducts Corporation Cartridge, cartridge cleaning apparatus and method for cleaning a corona wire
US5687054A (en) * 1996-03-08 1997-11-11 Konica Corporation Corona charging apparatus
US20030180065A1 (en) * 2001-02-28 2003-09-25 Walgrove George R. Mechanism and method for cleaning corona wires
US6868242B2 (en) * 2001-02-28 2005-03-15 Eastman Kodak Company Mechanism and method for cleaning corona wires
US7043176B1 (en) 2002-09-26 2006-05-09 Eastman Kodak Company Apparatus and method for damping a corona wire in an electrographic printer
US20050207778A1 (en) * 2004-03-17 2005-09-22 Kabushiki Kaisha Toshiba Charger and image forming apparatus
US7003243B2 (en) 2004-03-17 2006-02-21 Kabushiki Kaisha Toshiba Charger and image forming apparatus
US20060002733A1 (en) * 2004-03-17 2006-01-05 Kabushiki Kaisha Toshiba Charger and image forming apparatus
US7110695B2 (en) 2004-03-17 2006-09-19 Kabushiki Kaisha Toshiba Charger and image forming apparatus
US20070151455A1 (en) * 2005-07-06 2007-07-05 Gates Peter J Cleaning device
US20070065173A1 (en) * 2005-09-16 2007-03-22 Xerox Corporation Cleaning system for a charging device in a xerographic printer
US7412186B2 (en) * 2005-09-16 2008-08-12 Xerox Corporation Cleaning system for a charging device in a xerographic printer
US20080260417A1 (en) * 2007-04-20 2008-10-23 Kyocera Mita Corporation Charging device and image forming apparatus having the same
US20110274459A1 (en) * 2010-05-07 2011-11-10 Toshiba Tec Kabushiki Kaisha Image forming apparatus, charging apparatus and cleaning method of charging apparatus
US8630561B2 (en) * 2010-05-07 2014-01-14 Kabushiki Kaisha Toshiba Image forming apparatus, charging apparatus and cleaning method of charging apparatus

Also Published As

Publication number Publication date
CA1028387A (en) 1978-03-21
BR7405813D0 (pt) 1975-05-20
IT1017231B (it) 1977-07-20
GB1458088A (en) 1976-12-08
DE2424835A1 (de) 1975-01-30
ES428358A1 (es) 1976-09-16
SE7406925L (enrdf_load_stackoverflow) 1975-01-20
AU7117174A (en) 1976-01-15
FR2238175A1 (enrdf_load_stackoverflow) 1975-02-14
NL7409632A (enrdf_load_stackoverflow) 1974-09-25
FR2238175B1 (enrdf_load_stackoverflow) 1977-10-07
BE817485A (fr) 1974-11-04

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