EP0146945A2 - Appareil électrographique - Google Patents

Appareil électrographique Download PDF

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Publication number
EP0146945A2
EP0146945A2 EP84116042A EP84116042A EP0146945A2 EP 0146945 A2 EP0146945 A2 EP 0146945A2 EP 84116042 A EP84116042 A EP 84116042A EP 84116042 A EP84116042 A EP 84116042A EP 0146945 A2 EP0146945 A2 EP 0146945A2
Authority
EP
European Patent Office
Prior art keywords
sheet
copy
path
image
dimension
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.)
Granted
Application number
EP84116042A
Other languages
German (de)
English (en)
Other versions
EP0146945A3 (en
EP0146945B1 (fr
Inventor
Matthew J. Russel
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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
Priority claimed from US06/566,010 external-priority patent/US4477176A/en
Priority claimed from US06/575,966 external-priority patent/US4537493A/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0146945A2 publication Critical patent/EP0146945A2/fr
Publication of EP0146945A3 publication Critical patent/EP0146945A3/en
Application granted granted Critical
Publication of EP0146945B1 publication Critical patent/EP0146945B1/fr
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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0105—Details of unit
    • G03G15/0131—Details of unit for transferring a pattern to a second base
    • 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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
    • G03G15/6558—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point
    • G03G15/6561—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point for sheet registration
    • G03G15/6564—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point for sheet registration with correct timing of sheet feeding
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/00409—Transfer device
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00443—Copy medium
    • G03G2215/00447—Plural types handled

Definitions

  • the present invention relates to electrographic apparatus; more particularly, the present invention relates to electrographic apparatus which produces copies on copy sheets of at least first and second dimensions.
  • U.S. Patent No. 4,251,154 there is disclosed a technique in which color separation images of an original are superimposed upon a sheet to produce a color copy of the original.
  • the disclosed apparatus includes a movable image transfer member for receiving related transferable color separation images in non-overlapping image areas.
  • a transfer mechanism, mounted adjacent the image transfer member employs a register roller of a fixed dimension to successively position a receiver sheet in image transfer relation to the color separation images on the moving transfer member to superimpose the color separation images on the receiver sheet.
  • a problem with the disclosed apparatus is that it is limited to producing copies of a single dimension as measured in the direction of movement of the image transfer member. Although it would be possible to accommodate different copy sheet sizes by making the register roller of a dimension to handle the largest desired paper size, such an arrangement results in a loss of efficiency when copies on smaller copy sheets are desired.
  • electrographic apparatus for producing copies on copy sheets of at least first or second dimensions, said apparatus comprising a movable image transfer member upon which transferable unfixed images are formed, copy sheet positioning apparatus which includes first sheet positioning means located adjacent to said image transfer member, said first sheet positioning means defining a first path for a copy sheet of said first dimension and being operable to remove said copy sheet of said first dimension from transferable relationship with said image transfer member after transfer of one unfixed image to said sheet of said first dimension and to reposition said copy sheet in transferable relationship with a successive unfixed image on said image transfer member characterized in that a second sheet positioning means is provided which together said first sheet positioning means defines a second path for a copy sheet of said second dimension, said second sheet positioning means cooperating with said first sheet positioning means to remove said copy sheet of said second dimension from transferable relationship with said image transfer member after transfer of one unfixed image to said copy sheet and to reposition said copy sheet in transferable relationship with a successive unfixed image on said image transfer member.
  • a principal advantage of the present invention is that copies can be produced on copy sheets of different sizes, and the apparatus can be operated under optimum conditions for each of the sizes. Further, the disclosed apparatus for positioning copy sheets of at least two different sizes is particularly suitable for positioning copy sheets at multiple stations located along the image transfer member.
  • Electrographic apparatus 10 which is operable to produce copies of different dimensions in which a plurality of superimposed images are formed on a copy.
  • Electrographic apparatus 10 includes a flexible image transfer member in the form of a photoconductive belt 12 trained about rollers 14, 16, 18, 19, 20, and 22. Belt 12 is moved in a clockwise direction by means of a drive motor 24 which is linked to roller 22. Belt 12 has a plurality of sequentially spaced non-overlapping image areas which pass successively through a series of electrophotographic processing stations located along the path of belt 12.
  • Belt 12 preferably includes timing marks such as regularly spaced perforations 25 (Fig. 4A) which are sensed by sensor 26 to provide timing signals to logic and control unit (LCU) 28.
  • Logic and control unit 28 includes a microprocessor such as model 8085 available from the Intel Corporation of California.
  • An encoder 30 is also linked to roller 22 and produces timing signals for LCU 28 which are used with the timing signals from sensor 26 to control the operation of electrographic apparatus 10.
  • Transferable images are formed on belt 12 through the steps of charging, exposing, and developing.
  • a corona charger 32 applies a substantially uniform electrostatic charge on belt 12.
  • a light image of an original image is projected onto the charged belt to discharge those areas struck by light to form a latent electrostatic image corresponding to the original image.
  • related color separation latent electrostatic images are formed sequentially and in spaced relation on belt 12 by exposing an original 36 moved onto transparent platen 38 by means of feed rollers 40 and 42 or recirculating document feeder 44.
  • four sequential latent electrostatic images are formed on belt 12 by successively illuminating document 36 by means of xenon flash lamps 46 and 48 to produce light images which are projected upon belt 12 at exposure station 34 by means of mirrors 50 and 52 and projection optics 54.
  • Projection optics 54 are movable in order to permit enlarged or reduced images of the original document 36.
  • the document 36 for example, is illuminated four successive times to produce four related latent electrostatic separation images by successively inserting into light path 56, neutral density filter 58, red filter 60, green filter 62, and blue filter 64.
  • Filters 58, 60, 62, and 64 are sequentially activated by solenoids 66, 68, 70, and 72 respectively, which are selectively actuated by LCU 28.
  • solenoids 66, 68, 70, and 72 are selectively actuated by LCU 28.
  • Developer station 74 has a plurality of magnetic brush toning stations which are adjacent to but spaced from the path of belt 12. Thus, for four-color reproduction four magnetic brush toning stations are provided. Developer station 74 includes (1) black toning station 76 containing black toner particles to develop the black electrostatic latent image; (2) cyan toning station 78 containing cyan toner particles which are complementary in color to develop the red electrostatic latent image; (3) magenta toning station 80 containing magenta toner particles which are complementary in color to develop the green electrostatic latent image; and (4) yellow toning station 82 containing yellow toner particles which are complementary in color to develop the blue electrostatic latent image.
  • Backup rollers 84, 86, 88, and 90 are located on the opposite side of belt 12 and are selectively activated by solenoids 92, 94, 96, and 98 through control of LCU 28.
  • rollers 84, 86, 88, and 90 When one of rollers 84, 86, 88, and 90 is moved into contact with belt 12, belt 12 is deflected from its normal path into operative engagement with a respective magnetic brush so that charged toner particles of the engaged magnetic brush are attracted to the oppositely charged latent electrostatic image to develop the latent image into a transferable unfixed toner image.
  • LCU 28 actuates solenoid 92 to move roller 84 to deflect belt 12 so that the black image is developed by black toner particles brought up into contact with belt 12 by a magnetic brush at toning station 76.
  • solenoid 92 retracts roller 84 so that belt 12 returns to its non-deflected path. Similar operating cycles for stations 78, 80, and 82 are effected, so that the red latent electrostatic image is developed only with cyan toner particles, the green latent electrostatic image is developed only with magenta toner particles and the blue latent electrostatic image is developed only with yellow toner particles.
  • belt 12 is irradiated by post-development erase lamp 100 to reduce the electrostatic attraction between the toner image and the photoconductive belt.
  • apparatus 10 is operable to produce copies of standard office sizes such as 8-1/2 x 11 inches (0.216 x 0.28m) and 8-1/2 x 14 inches (0.216 x 0.356m) so that the short dimension, for example, 8-1/2 inches (0.216m), is oriented in the direction of belt movement in order to increase productivity.
  • Belt-12 has a width which is sufficient to contain an image of the longest copy to be produced.
  • belt 12 has a width of approximately 16 inches (0.406m) and would contain a series of non-overlapping image frames each having a first dimension of L1 (Fig. 4A, 4B) in the direction of movement of belt 12.
  • L1 is the sum of the image width plus an interframe distance 11 between copies; e.g., for an image width of 8-1/2 inches (0.216m) and an interframe distance of 1-1/2 inches (0.038m), Ll equals 10 inches (0.254m).
  • the length of belt 12 is equal to the number of image frames times Ll; e.g., a six-frame belt would have a 60-inch (1.524m) length.
  • apparatus 10 is operable to produce copies having widths of double the normal copy width such as widths used in books and magazines.
  • This mode is illustrated in Figs. 4C and 4D where belt 12 is divided into a series of image frames having a second dimension L2 which is large enough to produce copies of double copy size such as 17 by 11 inches (0.432 x 0.28m) (Fig. 4C) and 17 by 14 inches (0.432 x 0.356m) (Fi g . 4D) with an interframe distance 12 of 3 inches (0.038m).
  • LCU 28 is programmed to skip every second perforation 25 on belt 12 to control operation of apparatus 10.
  • Apparatus 10 is provided with a first supply 102 of copy sheets of a first dimension such as 8-1/2 x 11 inches (0.216 x 0.28m) and a second supply 104 of copy sheets of a second dimension such as 17 x 11 inches (0.432 x 0.28m).
  • An operator-selectable sheet size switch on control,and display panel 106 provides a signal to logic and control unit 28 to feed either a copy sheet of the first dimension from supply 102 or copy sheet of a second dimension from supply 104.
  • a vacuum feed roller 108 will separate a sheet 110 from supply 102 and move it into engagement with registration mechanism 112.
  • Mechanism 112 releases the copy sheet in timed relationship with the first toner image on belt 12 in advance of transfer station 114 which includes transfer charger l18 and detack charger 116.
  • transfer station 114 which includes transfer charger l18 and detack charger 116.
  • a charge opposite to the charge of the toner image is applied to the back of sheet 110 to transfer the first (black) electrostatic image from belt 12 to one side of sheet 110.
  • Sheet 110 and belt 12 then move under detack corona charger 116 which neutralizes the charge on sheet 110 so that it may be easily separated from belt 12.
  • copy sheet positioning apparatus 120 In order to register copy sheet 110 with the second (cyan) toner image on belt 12, the sheet bearing the black toner image is removed from transferable relationship with belt 12 and is repositioned in transferable relationship with the next successive toner image on belt 12.
  • copy sheet positioning apparatus 120 In order to effect removal and repositioning, according to the present invention, there are provided a plurality of copy sheet positioning apparatus spaced along belt 12 between transfer stations.
  • copy sheet positioning apparatus 120 is located adjacent to belt 12 opposite roller 16 between transfer stations 114 and 122;
  • copy sheet positioning apparatus 158 is located adjacent to belt 12 opposite roller 18 between transfer stations 122 and 161; and
  • copy sheet positioning apparatus 168 is located adjacent to belt 12 opposite roller 19 between transfer stations 161 and 172.
  • Copy sheet positioning apparatus 120, 158 and 168 are similar in construction and operation.
  • Copy sheet positioning apparatus 120 includes a first sheet positioning assembly for defining a first path for a copy sheet of a first dimension and a second copy sheet positioning assembly operating cooperatively with the first sheet positioning assembly for defining a second sheet path for a copy sheet of a second dimension.
  • first sheet positioning assembly includes a vacuum roller 124 spaced from belt 12 which is dimensioned to have a circumference equal to the length of image frame L1 and which defines a first path 126 around the periphery of roller 124.
  • a second copy sheet path 128 has a length equal to the dimension of image frame L2 and comprises a second copy sheet positioning assembly including vacuum roller 130 and movable plenum 132 and fixed plenum 134 located between vacuum rollers 124 and 130.
  • Sheet 110 then travels along with belt 12 to second transfer station 122 where second corona transfer charger 157 transfers the cyan toner image to sheet 110 in registration with the previously transferred black toner image.
  • Second detack corona charger 159 then neutralizes the charge on sheet 110 so that vacuum roller 156 (which is spaced from belt 12) of second copy sheet positioning apparatus 158 can remove sheet 110 from transferable relationship with belt 12 and move it around path 160 back into transferable relationship with the third (magenta) toner image.
  • Copy sheet l10 then moves with belt 12 under third transfer corona charger 162 which transfers the magenta toner image onto sheet 110 in registration with the previously transferred black and cyan toner images.
  • Detack charger 164 neutralizes the charge on sheet l10 so that sheet l10 may be removed from transferable relationship with belt 12 by means of vacuum roller 166 (spaced from belt 12) of third copy sheet positioning apparatus 168. Roller 166 moves sheet 110 around path 170 and repositions sheet 110 in transferable relationship with the fourth (yellow) and last toner image on belt 12. Sheet 110 then travels with belt 12 to fourth transfer station 172 where fourth transfer corona charger 174 transfers the yellow toner image onto sheet l10 in registration with the black, cyan and magenta toner images.
  • Fourth detack charger 176 neutralizes the charge on sheet 110 so that it is separated from belt 12 at roller 20 and transported by means of vacuum transport 178 into the nip formed by fuser rollers 180 and 182 to fuse the superimposed toner images to sheet 110. Sheet 110 is then fed into output tray 184.
  • a cleaning station 186 is provided to effect mechanical and electrical cleaning of photoconductive belt 12.
  • Station 186 includes a cleaning assist erase lamp 188 which exposes photoconductive belt 12 to radiation to substantially reduce any charge remaining on belt 12; a cleaning assist charger 190 which impresses an alternating current charge on belt 12 to neutralize the charges on untransferred toner particles; and a brush 192 to remove any residual toner from belt 12 so that belt 12 is ready for another electrophotographic cycle.
  • a copy sheet 194 of a second dimension (e.g., 17 x 11 inches (0.432 x 0.28m) is fed from supply 104 to registration mechanism 196 which registers sheet 194 with the first toner image on belt 12 - . Transfer of the. first toner image to sheet 194 is effected by transfer charger 118 and the charge on sheet 194 neutralized by detack charger 116.
  • Copy sheet positioning apparatus 120 operates to move sheet 194 around second path 128.
  • solenoid 136 has been actuated by LCU 28 to move plenum 132 to a closed position.
  • Stepper motor 198 is linked to rollers 124 and 130 and causes them to rotate in a counterclockwise direction.
  • LCU 28 also causes vacuum source 140 (Fig. 3) to apply a vacuum over conduits 146 and 142 to plenums 138 and 150 of roller 124 but not to plenum 148.
  • Vacuum source 140 also applies vacuum to plenums 132 and 134 respectively over conduits 200 and 202 and to plenum 204 of roller 130 over conduit 206.
  • vacuum roller 124 separates sheet 194 from transferable relationship with belt 12 and in association with roller 130 moves it along path 128.
  • the vacuum in plenum 138 is removed and sheet 194 travels with belt 12 to transfer station 122 where the second image is transferred onto sheet 194.
  • a second copy sheet positioning apparatus 158 (Fig. 1) removes sheet 194 from transferable relationship with belt 12 and repositions it in transferable relationship with the third toner image on belt 12.
  • Apparatus 158 is similar in construction to apparatus 120 and includes first vacuum roller 156, second vacuum roller 208 and vacuum plenums 212 and 214 located between rollers 156 and 208.
  • Roller 208 is operated in synchronism with roller 156 by means of stepper motor 210 linked to rollers 156 and 208 and vacuum plenums 212 and 214 located between- rollers 156 and 208.
  • Vacuum plenum 212 has been moved to a closed position by solenoid 216 so that after sheet 194 has been separated from belt 12 by roller 156, it moves along second path 217.
  • Copy sheet postioning apparatus 158 then repositions sheet'194 in registration with the third toner image on belt 12 which is transferred to sheet 194 at transfer station 161. Thereafter, sheet 194 is removed from transferable relationship with belt 12 at roller 19 by means of third copy sheet positioning apparatus 168 which includes vacuum rollers 166 and 218 rotated in synchronism by stepper motor 220. Apparatus 168 also includes vacuum plenums 222 and 224 located between rollers 166 and 218. Solenoid 226 has moved plenum 224 to its closed position so that when roller 166 has removed sheet 194 from transferable relationship with belt 12 sheet 194 is moved along a second path 228.
  • Sheet 194 is repositioned in transferable relationship with belt 12 in registration with the fourth toner image thereon.
  • the fourth image is transferred to sheet 194 in superimposed relationship with the first, second, and third toner images at transfer station 172.
  • sheet 194 is separated from belt 12 at roller 20 and transported by means of vacuum transport 178 to the nip of fuser rollers 180 and 182 which permanently fuse the toner images to sheet 194.
  • Sheet 194 is then fed to output tray 184.
  • the order of color separation image exposure, development, and transfer is selected in order of decreasing influence on sharpness of the reproduced composite image; for example, black, then cyan, then magenta, then yellow. Accordingly, the four transferred images yield a sharp full color reproduction of the original on the copy sheet.
  • the employment of four separate transfer corona charges and three separate copy sheet positioning apparatus interposed between the transfer charges provides for more accurate control of image transfer and superimposed image registration.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Electrophotography (AREA)
EP19840116042 1983-12-27 1984-12-21 Appareil électrographique Expired - Lifetime EP0146945B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US566010 1983-12-27
US06/566,010 US4477176A (en) 1983-12-27 1983-12-27 Apparatus for producing multiple image simplex and duplex copies in a single pass
US06/575,966 US4537493A (en) 1984-02-01 1984-02-01 Copy sheet positioning apparatus
US575966 1984-02-01

Publications (3)

Publication Number Publication Date
EP0146945A2 true EP0146945A2 (fr) 1985-07-03
EP0146945A3 EP0146945A3 (en) 1988-02-24
EP0146945B1 EP0146945B1 (fr) 1990-05-23

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EP19840116042 Expired - Lifetime EP0146945B1 (fr) 1983-12-27 1984-12-21 Appareil électrographique

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EP (1) EP0146945B1 (fr)
DE (1) DE3482341D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004443A1 (fr) * 1986-12-09 1988-06-16 Eastman Kodak Company Appareil de transfert par rouleau
WO1988005564A1 (fr) * 1987-01-27 1988-07-28 Eastman Kodak Company Appareil electrostatique pourvu d'un tambour de transfert
WO1988005563A1 (fr) * 1987-01-27 1988-07-28 Eastman Kodak Company Appareil electrostatique en couleurs pourvu d'un organe de transfert intermediaire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191465A (en) * 1978-07-03 1980-03-04 Eastman Kodak Company Apparatus for producing simplex of duplex copies
US4192607A (en) * 1978-07-12 1980-03-11 Eastman Kodak Company Apparatus for selectively copying documents from two different document feeders
US4251154A (en) * 1979-04-09 1981-02-17 Eastman Kodak Company Electrophotographic color copier
DE3341774A1 (de) * 1982-11-20 1984-05-24 Canon K.K., Tokio/Tokyo Bilderzeugungseinrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191465A (en) * 1978-07-03 1980-03-04 Eastman Kodak Company Apparatus for producing simplex of duplex copies
US4192607A (en) * 1978-07-12 1980-03-11 Eastman Kodak Company Apparatus for selectively copying documents from two different document feeders
US4251154A (en) * 1979-04-09 1981-02-17 Eastman Kodak Company Electrophotographic color copier
DE3341774A1 (de) * 1982-11-20 1984-05-24 Canon K.K., Tokio/Tokyo Bilderzeugungseinrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004443A1 (fr) * 1986-12-09 1988-06-16 Eastman Kodak Company Appareil de transfert par rouleau
WO1988005564A1 (fr) * 1987-01-27 1988-07-28 Eastman Kodak Company Appareil electrostatique pourvu d'un tambour de transfert
WO1988005563A1 (fr) * 1987-01-27 1988-07-28 Eastman Kodak Company Appareil electrostatique en couleurs pourvu d'un organe de transfert intermediaire

Also Published As

Publication number Publication date
EP0146945A3 (en) 1988-02-24
DE3482341D1 (de) 1990-06-28
EP0146945B1 (fr) 1990-05-23

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