US3615129A - Duplexing xerographic reproducing machine with a copy sheet reversing station - Google Patents

Duplexing xerographic reproducing machine with a copy sheet reversing station Download PDF

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Publication number
US3615129A
US3615129A US752075A US3615129DA US3615129A US 3615129 A US3615129 A US 3615129A US 752075 A US752075 A US 752075A US 3615129D A US3615129D A US 3615129DA US 3615129 A US3615129 A US 3615129A
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Prior art keywords
sheet
sheets
copy
duplexing
xerographic
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US752075A
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English (en)
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William A Drawe
John W Wagner
John F Wirley
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Xerox Corp
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Xerox Corp
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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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G03G15/232—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member
    • G03G15/234—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member by inverting and refeeding the image receiving material with an image on one face to the recording member to transfer a second image on its second face, e.g. by using a duplex tray; Details of duplex trays or inverters

Definitions

  • a xerographic reproducing device capable of being selectively operated in either of two modes.
  • the first mode involves the conventional xerographic reproduction of originals onto one side of sequentially fed copy sheets.
  • the second mode is a duplexing mode wherein the copy sheets are fed through an alternate path to sequentially and automatically produce printed material on both sides of copy sheets. Conversion to the duplexing mode is achieved by the actuation of a single switch which diverts the movement of copy sheets with fused xerographic images to a duplexing tray.
  • the original being copied may then be changed and the image bearing sheets, retained in the duplexing tray, fed through the reproducing apparatus again for creating images on the second side of the sheets.
  • This invention relates in general to continuous and automatic xerographic reproducing machines, and in particular, to improved xerographic reproducing machines capable of continuously and automatically forming images on either one or both sides of sequentially fed copy sheets.
  • a xerographic surface comprising a layer of photoconductive insulating material afiixed to a conductive backing is used to support electrostatic images.
  • the Xerographic surface is electrostatically charged uniformly over its surface and then exposed to a light pattern of the image being reproduced to thereby discharge the charge in the areas where light strikes the layer.
  • the undischarged areas of the layer thus form an electrostatic charge pattern in conformity with the configuration of the original light pattern.
  • the latent electrostatic image then can be developed by contacting it with a finely divided electrostatically attractable material such as a powder.
  • a finely divided electrostatically attractable material such as a powder.
  • the powder is held in image areas by the field of the electrostatic charges on the layer. Where the charge field is greatest, the greatest amount of material is deposited; where the charge field is least, little or no material is deposited.
  • a powder image is produced in conformity with the light image of copy being reproduced.
  • the powder is subsequently transferred to a sheet of paper or other surface and suitably affixed thereto to form a permanent print.
  • a reproducing machine having a plurality of copy sheet feed paths to permit fused xerographic copy to be moved exterior of the xerographic reproducing machine, or, in the alternative, to permit the fused Xerographic copy to be moved to an internal dupleXing station. From this duplexing station, the copy sheets may be fed through the reproducing elements to create copy on the second sides of the sheets so that the resulting copy sheets contain printed matter on both sides thereof.
  • FIG. 1 illustrates schematically a preferred embodiment of a xerographic reproducing machine constructed in ac cordance with the instant invention
  • FIG. 2 is a schematic illustration of the machine as shown in FIG. 1 but includes various timing switches;
  • FIG. 3 is a front view of the control panel of the xerographic machine.
  • FIGS. 4a, 4b, 4c, 4d, 4e and 4] are schematic electrical diagrams of the electrical components of the xerographic machines.
  • the automatic Xerographic reproducing apparatus comprises a Xerographic drum-shaped surface 10 including a photoconductive layer or light-receiving surface on a conductive backing. This surface is mounted on a shaft 12 journaled in a frame to rotate in the direction of the arrow to cause the drum surface sequentially to pass a plurality of Xerographic processing stations.
  • An exposure station B at which alight or radiation pattern of copy to be reproduced is projected onto the drum surface to dissipate the drum charge in the exposed areas thereof and thereby form a latent electrostatic image of the copy to be reproduced;
  • a developing station C at which a xerographic developing material including toner particles having an electrostatic charge opposite to that of the electrostatic latent image are cascaded over the drum surface, whereby the toner particles adhere to the latent electrostatic image to form a xerographic powdered image in the configuration of the copy being reproduced;
  • a transfer station D at which the xerographic powder image is electrostatically transferred from the drum surface to a transport material or drum surface;
  • the various charging functions are carried out by corotrons positioned around the periphery of the drum. These include the charging corotron 14, the transfer corotron 16 and the neutralization corotron 18.
  • the optical image is projected onto the rotating drum from a support member which consists of a transparent curved platen on copy board 20 illuminated by banks of suitable lamps LMPs.
  • the image on the copy board is scanned by an oscillating object mirror 22 and projected through a fixed lens 24 and reflected from a fixed image mirror 26 to a fixed light shield 28.
  • the timed relationship between the object mirror 22 and rotation of the drum permits the dissipation of the charge on the photoconductive surface to correspond to the image being reproduced.
  • the primary path of travel for copy sheets to receive toner powder images transferred from the drum includes suitable sheet feeding elements housed in a sheet forwarding assembly 30.
  • This assembly acts to sequentially forward sheets to the bottom of the first or A transport 32 which is a vacuum conveyor.
  • a first set of stop register fingers RSl acts to align and temporarily stop the leading edge of each copy sheet to thereby permit it to be moved into contact with the rotating drum in alignment with the toner image to be transferred.
  • the copy sheet is removed from the drum and transported by means of the second or B transport 36.
  • the fuser rolls 38 and 40 which affix the toner image to the copy sheet for creating a permanent copy.
  • the next conveying element is the third or C transport 42 which moves the copy sheet to an elevated location for depositing it in the copy catch tray 44 associating with exterior of the xerographic reproducing machine.
  • an alternate copy sheet path includes a pivotable deflector plate 46 positioned between the fuser rollers 38 and 40 and the C transport 42. As shown in the dotted line position of FIG. 1, the plate is positioned to permit copy to pass thereover and deposit it in copy catch tray 44. When, however, it is moved by the solenoid SOL-1D into the solid line position of FIG. 1, it will deflect the copy sheet with fused images past a first pair of guide plates 48 onto a third or D transport belt 50, and into contact with initial guide plate 52 and then into duplexing tray 54. It is then possible after the predetermined number of copy sheets has been fed through this path into the duplexing tray 54 to sequentially feed these sheets through the xerographic reproducing cycle once again for creating images on the reverse side thereof.
  • pivot fingers 56 As sheets with fused images on one side thereof, are entering the duplexing tray 54, pivot fingers 56, operable off of solenoid SOL-4D, are in an activated position extending through the feed belts 58. Pivot fingers 56 guide the leading edges of copy sheets entering the duplexing tray and prohibit them from contacting and binding on the friction surface of the belts 58. After the run of sheets has entered the tray, the fingers 56 retract so that the sheets can rest in facing contact with the belts for being sequentially refed through the xerographic transfer and fusing stations.
  • solenoid SOL-5D to energize the belts 58 to feed the sheet in contact therewith upwardly.
  • This depression of the START-PRINT button also allows solenoid SOL3D to be periodically tripped to urge pressure fingers 60 into contact with the sheets being fed so that good frictional contact can be made between the belts 58 and the sheet in contact therewith.
  • SOL3D is operable off of limit switch 28LS on the main cam bank of the machine.
  • Rotation of the belts 58 also rotates the lower feed rolls 62 and 64 to feed the sheet through the lower guide plates 66, through upper feed rolls 68 and 70, through upper guide plates 72 and into contact with the A transport 32. At this point the sheet is in the conventional feed path corresponding to the non-duplex mode. It can then be fed by the A transport 32, into contact with the first stop register fingers RS-l for receiving transferred toner images by conventional feeding through the xerographic transfer station D.
  • the sheet being held by stop register fingers RS2 is released at the proper time by the influence of a newly provided limit switch 36LS on the machine cam bank. Actuation of 36LS moves the register fingers RS2 out of interfering contact with the sheet and de-energizes solenoid SOL-2D to close the rotating upper pinch rolls 68 and 70 to drive this sheet into contact with the A transport and primary stop register fingers RS-l in the conventional non-duplexing manner. Actuation of 3615 also reactivates the solenoid SOL-5D to yet feed a third sheet from the duplexing tray 54 so that this third sheet can move up to the stop register fingers RS2 to replace the sheet previously fed out into contact with the primary stop register fingers RS-l.
  • the limit switch 27LS acts to trip the solenoid SOL5D to remove power from the belts 53 and lower feed rolls 62 and 64 so long as the sheet being brought from the duplexing tray 54 has advanced far enough that it trips limit switch XLS. If the following sheet should be advanced late from the duplexing tray, it will continue to be fed upwardly until it trips XLS.
  • this feeding of sheets for the duplexing mode continues in a sequential manner until all of the sheets are fed. Termination of the duplexing sheet feeding operation is accomplished by copycount coincidence being reached between the number of sheets dialed on the programmer and the pulsation of the programmer as counted by 27LS.
  • the control panel of the apparatus as shown in. FIG. 3 is also substantially the same as that described in the aforementioned Osborne patent. There is, however, a modification in the lower righthand corner thereof. This modification includes a DUPLEX ON switch and a DUPLEX OFF switch and a pair of lamps LMP-Sl and LMP-SZ marked DUPLEX SIDE 1 and DUPLEX SIDE 2 respectively.
  • the SPECIAL DOCUMENT light has been removed from the disclosed Osborne et al. machine along with its accompanying function.
  • the operator In order to operate the machine in the conventional non-duplexing mode, the operator merely depresses the DUPLEX OFF switch, dials the desired number of copy sheets on the selector knobs 81A, 82A, and SSA with the POWER ON switch depressed and then presses the START PRIINT button. The dialed number of copies of the original are then created and fed out into the copy catch tray. -When, however, an operator wishes to run the machine in the duplex mode, he will operate in the same manner as before, but, instead of depressing the DUPLEX OFF switch, he will depress the DU- FLEX ON switch.
  • the depression of the START PRINT button will cause the dialed number of copies to be created and fed into the duplexing tray 54.
  • the lamp LMP-Sl behind the DUPLEX SIDE 1 indicator will become inactivated and will illuminate LMPASZ to indicate that the machine is ready to begin creating copy on the reverse sides of the copy sheets in the duplexing tray.
  • the operator may then take the original document off the platen member 20 and replace it with another document, the contents of which are desired to be reproduced on the opposite side of the cop'y' sheets.
  • the depression of the START BRINT button will then refeed the copy sheets from. the duplexing tray through the xerographic transfer station to form the powdered image on the reverse side of the copy sheets. Further movement through the fuser and along the C transport 42 will deposit the copy sheets into the copy catch tray with xerographic reproductions on both sides thereof.
  • the sheet feeding elements adiacent the duplexing tray will continue to feed all of the copy sheets therefrom. until coincidence is again reached between the copy count indicator and the preselected dialed number of copies.
  • circuitry as shown in FIGS. 40, 4b, 4c, and 4d. These electrical schematics are substantially the same as those shown and described in the aforementioned Osborne patent. Various parts of the circuitry, however, have been removed since their functions are no longer necessary, desired or expedient. For example, the interlocked circuits and abort circuit have been removed.
  • a duplexing drawer interlodk limit switch DLS has been added to the circuit to insure that the machine cannot operate unless the drawer housing containing the D transport 48 has been slid into the machine.
  • These elements have been made slidable on a drawer for clearance in the event of a paper jam in this region in a manner similar to the B transport drawer mounting described in the aforementioned Osborne patent.
  • FIGS. 4e and 4 are supplemental t0 the circuitry of FIGS. 4a, 4b, 4c and 4d to accommodate the duplexing functions.
  • FIG. 4] may generally be referred to as the duplexing standby circuit.
  • the power-on button In order to operate the machine, the power-on button must first be depressed to bring the fuser temperature up to an operational degree. The operator would then press either the duplex-on or duplex-off button depending on the mode desired to be made. The machine will remain in the mode that it was last operated. If it is desired, for example, to make a duplex run, and the machine was last run in the non-duplex mode, the DUPLEX ON button would have to be depressed. When operating in the duplex side 1 mode, SOL-4D is not energized. Therefore, fingers 56 extend through belts 58 to guide copy sheets entering the duplexing tray 54.
  • the depression of the DUPLEX ON switch, which is connected to line 147, pulls in relay XOR-1, which has three contacts. Pulling in relay XOR sets up the circuit for the standby duplex circuit. .As its first contact XOR-1 closes, it pulls in relay IYCR and ZYOR. Contact 1YC R1 is the holding contact for the IYOR and ZYCR coils to keep them energized after the programmer reaches coincidence and TCRZ is opened. This closes contact lYCtR- 2A to light lamp LMP-S1 to indicate we are ready to operate in the DUPLEX SIDE 1 mode.
  • duplex side 1 we supply power to the divertor solenoid SOL-1 so that the divertor plate 46 will direct copy sheets onto the duplexing transport 50 and into the duplexing tray 54.
  • This also acts to feed copy sheets in the normal mode of operation through the xerographic transfer station D until the number of sheets passing 8LS and the transfer station D causes the copy count indicator to reach coincidence with the programmer STR with the preselected number of sheets to be printed.
  • relay RCR will be picked up. This serves two functions. The first function is to provide the normal functions of 7CR (FIG. 40) which is to be used in series with the programmer STR to provide shutdown for the machine. In this duplex-side 1 mode we start to time out our machine via relay contact RC-Z which is connected to line 108 and the 7CR coil. The picking up of RCR also energizes a mechanical latching relay TCR into its alternate position. When we pull in the mechanical latching relay TCR, this in turn serves two functions. It picks up relay SCR which has a contact SCR-1 in series with the relay IYCR and ZYCR coils.
  • duplexing side 1 After completion of duplexing side 1, the machine automatically reverts to a duplex side 2 mode. Immediately upon the reaching of programmer copy count coincidence, 4CR-3 drops out. This would remove power from the lower duplex paper feeding elements 4670. However, the ZYCR-l contact has normally gone closed after 4CR-3 is open. Therefore, the paper feeding elements adjacent the duplexing tray 54 are inactivated at this time. In any event no power is being supplied to the paper feeder during the timing out of side 1.
  • the sheet feeding assembly in general acts to sequentially drive single sheets up to the A transport 32 where it is fed past limit switch 27LS.
  • the function of 1WCR is to close the SOL2D circuit to separate the upper drive rolls.
  • 1WCR-1B will remove power from the clutch SOLSD and finger solenoid SOL-3D. It will also remove power from the primary rectifier circuit PRC-1 unless we do not have a second sheet in the lower rolls 62, 64.
  • Limit switch XLS is located just in front of the lower rolls so that the conveying elements and their actuator SOLSD will remain energized and get the second sheet of paper up just in front of the pinch of these rolls into contact with XLS. In this location the next sheet is ready to be fed up to the A transport 32.
  • Switch XLS is located in series with a relay VCR.
  • VCR keeps power out of the primary rectifier and also, when energized, it will remove power opening the finger solenoid SOL-3D circuit.
  • the next step is to move the paper from the A transport 32 into the transfer zone D in synchronism with the rotating image on the drum I0.
  • This registration is accomplished by a cam switch 36LS on the cycling switch bank of the machine.
  • Contact 1WCR1A sets up the circuit to relay ZCR when switch 27LS is closed by being contacted by a copy sheet. This energizes IWCR and, thereafter, relay ZCR is picked up through 36LS, the timing switch on the machine cam bank.
  • the conventional non-duplexing mode employs 5LS which is also on the conventional cam bank. In the duplex mode the switch 36LS is em ployed to compensate for the different traveling distances of sheets to stop register fingers RS4 in the different modes.
  • the switch 36LS is a momentary switch which, when actuated, indicates that the drum is in registration with the paper waiting on the A transport.
  • 36LS will pull in relay ZCR which holds itself in with ZCR-l, ZCR-2 supplies power to the primary rectifier circuit again causing the belt 58 to drive and the fingers 60 to depress the next paper into contact with the belt.
  • Actuation of ZCR also actuates ZCR-3, which is in series with the upper drive pinch rolls 68 and 70, solenoid SOL2D causing 8 these rolls to close and drive the paper along the A transport to RS-l. This allows the second or following sheet to replace the previous sheet on the A transport against RS2 beyond 27LS for awaiting xerographic transfer.
  • Another switch, 2815 is also added to the circuit in parallel with VCR-2.
  • the function of 28LS is to assure that we bring fingers 60 into pressing contact with the belt at the same time of each cycle. If we did not have this 2.8LS, and depend merely on XLS to provide the timing to the pressure finger solenoid SOL-3D, we would have variations in the times that papers were transported up- Wardly by belts 58 due to timing variations caused by the mechanical fingers and belts.
  • duplexing sheet feeding elements fail to convey the sheet onto the A transport 32 and into the xero graphic transfer station D an image is still formed on the drum but does not get transferred to a copy sheet. This does not affect the coincidence count since no sheet has been fed to trip 27LS.
  • relay RCR When coincidence is reached, relay RCR is picked up to serve two functions. It closes contact RCR2 which starts the shutdown circuit by energizing relay 7CR. It also closes RCR-1 to energize the latch relay TCR. This puts us back into the duplex side 1 condition again by deenergizing relay SCR. The opening of TCR-1 drops out IYCR and ZYCR after a time delay since SCR does not get deenergized until line W-42 goes dead through machine time out. Note that relay SCR is connected to line 42 through TCR-1 and SCR-2. This mode of operation is desirable since we do not want to put the divertor solenoid SOL-1D down and send the duplexed copies back around into the duplexing tray. Thus we delay the switching of the divertor plate 46 until coincidence is again reached.
  • TCR2 connected in series with IYCR and ZYCR, is used to ensure that we remain in the duplex side 1 when the latch relay TCR is in that position or in a standby position.
  • SCR1 would normally close during standby, but the latch remains open because it is a mechanical latching relay and stays in the position in which it was last left.
  • the previously discussed limit switch 27LS is connected to line WK rather than line W47, for counting the duplex side to copy-count into the programmer. This counting is done on the pulsation of 27LS. As a sheet passes over it, IWCR-3 closes and feeds pulses into the programmer for counting until the copy-count indicator goes to zero again. 2WCR-2 ensures that we keep power on the duplex side two elements after reaching coincidence util the last sheet has entered the primary stop register fingers RS-l of the machine. This is necessary since 4CR- 3 drops out immediately upon the reaching of coincidence. ZYCR-Z prevents the double counting of pulses into the programmer during the duplex side 1 operation.
  • the stop-print button as We have modified the circuit now merely energizes relay 7CR to shut the machine down as desired. It does not effect our duplex mode of operation because we change from duplex side 1 to duplex side 2 by using relay RCR in conjunction with latch relay TCR which is not in the programmer of the basic machine of the aforementioned Osborne Patent. Thus the relay RCR remains in the condition in which it was last left.
  • a relay IXCR-3 in contact with the START PRINT button which prevents the operator from pushing the START PRINT button during a time-out cycle in the duplex mode until the operation has been completely timed out.
  • the above described xcrographic apparatus is capable of moving sheet material along a sheet feed path, from the sheet supply station to the sheet receiving station.
  • a first conveyor brings the sheet material into a position for receiving transferred toner images from a Zcrographic surface.
  • the sheet may then be directed to either a second or third conveyor.
  • the third conveyor will transport the imagebearing sheets to the sheet receiving station.
  • the second conveyor will transport the image-bearing sheets to a duplexing station which effectively reverses their orientation for supplemental movement past the Xerographic transfer station.
  • the sheets are transported by the third conveyor to the sheet receiving stations.
  • the various above described control means ensure that the sheet material will be moved along the sheet feed path by the proper conveyors for effecting the creation of copies in accordance with the mode of copying selected by the operator.
  • a Xerographic reproducing machine of the type having a photoconductive member, charging means to impose a uniform electrostatic charge on the member, exposure means to dissipate the charge onto a latent electrostatic image corresponding to an image to be reproduced, developing means to bring transferable toner particles into contact with the member to render the latent electrostatic image a transferable toner image, first conveyor means to move a copy sheet along a sheet feed path from a copy sheet supply station at one end of a sheet feed path into contact with the member in registration with the toner image thereon and then beyond, transfer means along the sheet feed path to transfer the toner image from the member to a sheet and fusing means along the sheet feed path beyond the transfer means to aflix the toner image to a sheet, the improvement comprising a sheet receiving station at the end of the sheet feed path remote from the sheet supply station,
  • a sheet deflector means positioned on the sheet feed path between the transfer means and the sheet receiving station
  • a sheet receiving duplexing station located remote from the portion of the sheet feed extended path between said sheet supply station and said transfer means capable of receiving, storing and then feeding a sheet therefrom back toward the transfer means
  • first control means to selectively control the position of the deflector means so as to convey a sheet to either the sheet receiving station when oriented in a first position or to the duplexing station when oriented in a second position.
  • a Xerographic reproducing machine of the type having a photoconductive member, means to create a latent electrostatic image on the member, developing means to bring transferably toner particles into contact with the member to create a transferable toner image on the member, transfer means to transfer the toner image from the member to a copy sheet, fusing means to affix the toner image to the copy sheet, a copy sheet supply station and a copy sheet receiving station, the improvement comprising first conveyor means to move copy sheets from the copy sheet supply station to the transfer means for the transferring of toner images onto the first sides of the copy sheets,
  • third conveyor means to move the copy sheets from the first conveyor means to the copy sheet receiving station, and sheet retaining means adjacent the second conveyor means adapted to receive and retain a plurality of toner image-bearing sheets and then sequentially feed the plurality of copy sheets therefrom in a reversed orientation so that the second movement of the copy sheets past the transfer means allows the transfer of toner images to the sides of the copy sheets opposite from the sides receiving the first toner images.
  • sheet retaining means adjacent the second conveyor means adapted to receive and retain a plurality of toner image-bearing sheets and then sequentially feed the plurality of copy sheets therefrom in a reversed orientation so that the second movement of the copy sheets past the transfer means allows the transfer of toner images to the sides of the copy sheets opposite from the sides receiving the first toner images.
  • first control means operable to vary the orientation of the deflector means so that copy sheets fed therepast may be either moved onto the second conveyor means or the third conveyor means.
  • the sheet retaining means includes a copy sheet receiving tray for receiving copy sheets moved onto the second conveyor means and for retaining the copies until a predetermined number of copy sheets have received toner images on one side thereof.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Counters In Electrophotography And Two-Sided Copying (AREA)
  • Conveyance By Endless Belt Conveyors (AREA)
  • Control Or Security For Electrophotography (AREA)
US752075A 1968-08-12 1968-08-12 Duplexing xerographic reproducing machine with a copy sheet reversing station Expired - Lifetime US3615129A (en)

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Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687541A (en) * 1970-12-23 1972-08-29 Xerox Corp Xerographic duplex technique
JPS4915435A (es) * 1972-05-19 1974-02-09
FR2212786A5 (es) * 1972-12-29 1974-07-26 Xerox Corp
US3841754A (en) * 1973-08-29 1974-10-15 Xerox Corp Duplex reproduction system
US3869202A (en) * 1972-12-29 1975-03-04 Ricoh Kk Electrophotographic copying machine
JPS5072623A (es) * 1973-10-26 1975-06-16
JPS5099553A (es) * 1973-12-28 1975-08-07
US3912253A (en) * 1973-10-23 1975-10-14 David J Jarman Entry and exit stacking system
JPS5166445U (es) * 1975-11-11 1976-05-26
DE2605822A1 (de) * 1975-02-13 1976-08-19 Canon Kk Kopiergeraet
US3999852A (en) * 1973-01-17 1976-12-28 Canon Kabushiki Kaisha Copying apparatus capable of both-side printing
US4050805A (en) * 1975-11-18 1977-09-27 Eastman Kodak Company Electrophotographic copying apparatus for two-sided copying
US4066252A (en) * 1975-05-16 1978-01-03 Agfa-Gevaert, Ag Copying apparatus
US4067649A (en) * 1976-01-23 1978-01-10 International Business Machines Corporation Method and apparatus for controlling the duplex copy mode in an electrostatic copying device
US4076407A (en) * 1976-03-18 1978-02-28 Xerox Corporation Duplex copying transfer system
US4080060A (en) * 1975-08-01 1978-03-21 Addressograph-Multigraph Corporation Copy system
DE2804492A1 (de) * 1977-02-09 1978-08-10 Xerox Corp Verfahren zur herstellung beidseitig bedruckter, sortierter kopiesaetze und zur durchfuehrung des verfahrens geeignete vorrichtung
US4110025A (en) * 1975-09-22 1978-08-29 Ricoh Company, Ltd. Duplex electrostatic copying machine
US4140387A (en) * 1976-06-01 1979-02-20 Eastman Kodak Company Apparatus for producing collated copies from two sided originals
DE2828669A1 (de) 1977-08-18 1979-03-01 Xerox Corp Verfahren und system zum automatischen vorgeordneten doppelseitigen umlaufkopieren eines satzes doppelseitiger dokumente
US4158500A (en) * 1977-02-14 1979-06-19 Eastman Kodak Company Apparatus for producing collated copies in page sequential order
US4172655A (en) * 1978-06-26 1979-10-30 Xerox Corporation Shingle sheet stacking for duplex copying
US4174905A (en) * 1977-02-14 1979-11-20 Eastman Kodak Company Method and apparatus for producing duplex copies
WO1979001073A1 (en) * 1978-05-16 1979-12-13 Ricoh Kk Reproducing apparatus
US4181078A (en) * 1977-12-08 1980-01-01 Am International, Inc. Automatic recirculating duplicator
US4272181A (en) * 1978-12-29 1981-06-09 International Business Machines Corporation Electrophotographic printer with duplex printed sheet output
US4291970A (en) * 1979-11-29 1981-09-29 Eastman Kodak Company Apparatus for producing duplex copies
JPS5767453A (en) * 1980-10-03 1982-04-24 Ricoh Co Ltd Reverser for sheet
US4348101A (en) * 1980-09-30 1982-09-07 Sperry Corporation Duplex printing apparatus
EP0078680A1 (en) * 1981-10-29 1983-05-11 Xerox Corporation Recirculating document handler
JPS58130351A (ja) * 1982-12-15 1983-08-03 Canon Inc 像形成装置
JPS594563A (ja) * 1983-05-23 1984-01-11 Ricoh Co Ltd 複写装置
US4466733A (en) * 1982-09-21 1984-08-21 Xerox Corporation Higher productivity recirculative document copying
US4466607A (en) * 1982-03-08 1984-08-21 The Mead Corporation Sheet inverting device
DE3429546A1 (de) * 1983-08-10 1985-02-28 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa Unterbrechungssteuereinheit fuer ein bilderzeugungsgeraet
JPS6063554A (ja) * 1984-08-06 1985-04-11 Ricoh Co Ltd 電子写真複写装置
JPS6063553A (ja) * 1984-08-06 1985-04-11 Ricoh Co Ltd 電子写真複写装置
US4512651A (en) * 1977-07-05 1985-04-23 Eastman Kodak Company Collating document feeder and reproduction apparatus having copy duplexing capabilities
EP0139223A2 (en) * 1983-09-19 1985-05-02 Mita Industrial Co. Ltd. Electrostatic copying apparatus
US4568169A (en) * 1981-07-30 1986-02-04 Minolta Camera Kabushiki Kaisha Both surface recording system
WO1986002746A1 (en) * 1984-10-25 1986-05-09 Hans Christian Hyltoft Electrophotographic information printer with automatical duplex sheet printing
USRE32284E (en) * 1976-01-15 1986-11-11 Xerox Corporation Document storage and transport apparatus
US4660963A (en) * 1985-12-30 1987-04-28 Xerox Corporation Auto duplex reproduction machine
US4673279A (en) * 1983-06-08 1987-06-16 Xerox Corporation Duplex copier
USRE32541E (en) * 1976-01-15 1987-11-10 Xerox Corporation Fluidic feeding of documents to an exposure station
US4708468A (en) * 1985-12-30 1987-11-24 Xerox Corporation Self adjusting paper guide
US4708462A (en) * 1985-12-30 1987-11-24 Xerox Corporation Auto duplex reproduction machine
US4721381A (en) * 1984-03-06 1988-01-26 Minolta Camera Kabushiki Kaisha Duplex copying apparatus
US4734738A (en) * 1985-04-28 1988-03-29 Mita Industrial Co., Ltd. Copying apparatus
US4777498A (en) * 1985-05-14 1988-10-11 Canon Kabushiki Kaisha Image forming apparatus
US4884110A (en) * 1985-07-09 1989-11-28 Konishiroku Photo Industry Co., Ltd Sheet conveyance apparatus
US4972271A (en) * 1981-12-17 1990-11-20 Canon Kabushiki Kaisha Image recording apparatus

Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687541A (en) * 1970-12-23 1972-08-29 Xerox Corp Xerographic duplex technique
JPS5514429B2 (es) * 1972-05-19 1980-04-16
JPS4915435A (es) * 1972-05-19 1974-02-09
FR2212786A5 (es) * 1972-12-29 1974-07-26 Xerox Corp
US3869202A (en) * 1972-12-29 1975-03-04 Ricoh Kk Electrophotographic copying machine
US3999852A (en) * 1973-01-17 1976-12-28 Canon Kabushiki Kaisha Copying apparatus capable of both-side printing
US3841754A (en) * 1973-08-29 1974-10-15 Xerox Corp Duplex reproduction system
US3912253A (en) * 1973-10-23 1975-10-14 David J Jarman Entry and exit stacking system
JPS5072623A (es) * 1973-10-26 1975-06-16
JPS5099553A (es) * 1973-12-28 1975-08-07
JPS599053B2 (ja) * 1973-12-28 1984-02-29 ゼロツクス コ−ポレ−シヨン 両面複写装置
DE2605822A1 (de) * 1975-02-13 1976-08-19 Canon Kk Kopiergeraet
US4098551A (en) * 1975-02-13 1978-07-04 Canon Kabushiki Kaisha Both side copying machine
US4066252A (en) * 1975-05-16 1978-01-03 Agfa-Gevaert, Ag Copying apparatus
US4080060A (en) * 1975-08-01 1978-03-21 Addressograph-Multigraph Corporation Copy system
US4110025A (en) * 1975-09-22 1978-08-29 Ricoh Company, Ltd. Duplex electrostatic copying machine
JPS5166445U (es) * 1975-11-11 1976-05-26
US4050805A (en) * 1975-11-18 1977-09-27 Eastman Kodak Company Electrophotographic copying apparatus for two-sided copying
USRE32284E (en) * 1976-01-15 1986-11-11 Xerox Corporation Document storage and transport apparatus
USRE32541E (en) * 1976-01-15 1987-11-10 Xerox Corporation Fluidic feeding of documents to an exposure station
US4067649A (en) * 1976-01-23 1978-01-10 International Business Machines Corporation Method and apparatus for controlling the duplex copy mode in an electrostatic copying device
US4076407A (en) * 1976-03-18 1978-02-28 Xerox Corporation Duplex copying transfer system
US4140387A (en) * 1976-06-01 1979-02-20 Eastman Kodak Company Apparatus for producing collated copies from two sided originals
DE2804492A1 (de) * 1977-02-09 1978-08-10 Xerox Corp Verfahren zur herstellung beidseitig bedruckter, sortierter kopiesaetze und zur durchfuehrung des verfahrens geeignete vorrichtung
US4116558A (en) * 1977-02-09 1978-09-26 Xerox Corporation Duplex system and method for pre-collation copiers
US4174905A (en) * 1977-02-14 1979-11-20 Eastman Kodak Company Method and apparatus for producing duplex copies
US4158500A (en) * 1977-02-14 1979-06-19 Eastman Kodak Company Apparatus for producing collated copies in page sequential order
US4512651A (en) * 1977-07-05 1985-04-23 Eastman Kodak Company Collating document feeder and reproduction apparatus having copy duplexing capabilities
DE2858789C2 (es) * 1977-08-18 1993-05-27 Xerox Corp., Rochester, N.Y., Us
US4459013A (en) * 1977-08-18 1984-07-10 Xerox Corporation Duplex/simplex precollation copying system
DE2828669A1 (de) 1977-08-18 1979-03-01 Xerox Corp Verfahren und system zum automatischen vorgeordneten doppelseitigen umlaufkopieren eines satzes doppelseitiger dokumente
US4181078A (en) * 1977-12-08 1980-01-01 Am International, Inc. Automatic recirculating duplicator
WO1979001073A1 (en) * 1978-05-16 1979-12-13 Ricoh Kk Reproducing apparatus
US4385825A (en) * 1978-05-16 1983-05-31 Ricoh Co., Ltd. Copying apparatus
US4172655A (en) * 1978-06-26 1979-10-30 Xerox Corporation Shingle sheet stacking for duplex copying
US4272181A (en) * 1978-12-29 1981-06-09 International Business Machines Corporation Electrophotographic printer with duplex printed sheet output
US4291970A (en) * 1979-11-29 1981-09-29 Eastman Kodak Company Apparatus for producing duplex copies
US4348101A (en) * 1980-09-30 1982-09-07 Sperry Corporation Duplex printing apparatus
JPS5767453A (en) * 1980-10-03 1982-04-24 Ricoh Co Ltd Reverser for sheet
US4568169A (en) * 1981-07-30 1986-02-04 Minolta Camera Kabushiki Kaisha Both surface recording system
EP0078680A1 (en) * 1981-10-29 1983-05-11 Xerox Corporation Recirculating document handler
US4972271A (en) * 1981-12-17 1990-11-20 Canon Kabushiki Kaisha Image recording apparatus
US4466607A (en) * 1982-03-08 1984-08-21 The Mead Corporation Sheet inverting device
US4466733A (en) * 1982-09-21 1984-08-21 Xerox Corporation Higher productivity recirculative document copying
US4468114A (en) * 1982-09-21 1984-08-28 Xerox Corporation Higher productivity recirculative document copying
JPS6230627B2 (es) * 1982-12-15 1987-07-03 Canon Kk
JPS58130351A (ja) * 1982-12-15 1983-08-03 Canon Inc 像形成装置
JPS594563A (ja) * 1983-05-23 1984-01-11 Ricoh Co Ltd 複写装置
US4673279A (en) * 1983-06-08 1987-06-16 Xerox Corporation Duplex copier
DE3429546A1 (de) * 1983-08-10 1985-02-28 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa Unterbrechungssteuereinheit fuer ein bilderzeugungsgeraet
EP0139223A3 (en) * 1983-09-19 1985-07-10 Mita Industrial Co. Ltd. Electrostatic copying apparatus
EP0139223A2 (en) * 1983-09-19 1985-05-02 Mita Industrial Co. Ltd. Electrostatic copying apparatus
US4721381A (en) * 1984-03-06 1988-01-26 Minolta Camera Kabushiki Kaisha Duplex copying apparatus
USRE33940E (en) * 1984-03-06 1992-05-26 Minolta Camera Kabushiki Kaisha Duplex copying apparatus
JPS6063553A (ja) * 1984-08-06 1985-04-11 Ricoh Co Ltd 電子写真複写装置
JPS6063554A (ja) * 1984-08-06 1985-04-11 Ricoh Co Ltd 電子写真複写装置
JPS6238699B2 (es) * 1984-08-06 1987-08-19 Ricoh Kk
JPS6238700B2 (es) * 1984-08-06 1987-08-19 Ricoh Kk
WO1986002746A1 (en) * 1984-10-25 1986-05-09 Hans Christian Hyltoft Electrophotographic information printer with automatical duplex sheet printing
US4734738A (en) * 1985-04-28 1988-03-29 Mita Industrial Co., Ltd. Copying apparatus
US4777498A (en) * 1985-05-14 1988-10-11 Canon Kabushiki Kaisha Image forming apparatus
US4884110A (en) * 1985-07-09 1989-11-28 Konishiroku Photo Industry Co., Ltd Sheet conveyance apparatus
US4660963A (en) * 1985-12-30 1987-04-28 Xerox Corporation Auto duplex reproduction machine
US4708462A (en) * 1985-12-30 1987-11-24 Xerox Corporation Auto duplex reproduction machine
US4708468A (en) * 1985-12-30 1987-11-24 Xerox Corporation Self adjusting paper guide

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