Abstract: Backlit messages guide the operator through the process of making duplex copies in either a simplex to duplex or duplex to duplex mode. The queing or sequence of the messages will adapt to the order of operator activity or performance to instruct the operator on the next operation to be performed. Once certain operations are performed, some backlit messages are turned off. In particular the messages instruct the operator to determine if specific paper trays are empty, to suitably load a recirculating document handler, to remove copies from one tray and place in a second tray, and to reposition documents in the document handler.

Abstract: A document handling apparatus/copy sheet processor/finishing apparatus arranged as an integrated system to produce bound copy sheets at high speed but with minimum mechanical activity by double exposing each document sheet, producing successive copy sheets in accordance with the exposure, distributing the successive copy sheets alternately into receiving trays and utilizing a set transport for each of the trays to bring copy sets alternately to a single point binding device.

Abstract: In a system for recirculative precollation copying of a set of simplex document sheets in reverse serial order on a copier providing a choice of precollated simplex or duplex (two-sided) copy sheet copying, more efficient duplex copying without an initial document counting circulation is provided by assuming that the copy sheets selected for duplex copying are non-orientation sensitive copy sheets such as plain paper (rather than special orientation restricted copy sheets requiring consistent inversion for proper output or binding edge orientation, such as sheets prepunched with binder holes, certain preprinted sheets, etc.

Abstract: A document handling apparatus/copy sheet processor/finishing apparatus arranged as an integrated system to produce bound copy sheets at high speed but with minimum mechanical activity by double exposing one or both sides of a document sheet, producing side-by-side copy sheets in accordance with either of the exposures modes, distributing the successive copy sheets alternately into receiving trays and utilizing a set transport for each of the trays to bring copy sets alternately to a single point binding device.

Abstract: A copier is described which is capable of simplex and duplex copying which includes a photoreceptor (11), first and second copy sheet trays (41 and 42) and a duplex buffer tray (43). A first sheet feeder (46) is associated with the first copy sheet tray (41) and a second sheet feeder (45) is commonly associated with the duplex buffer tray (43) and the second copy sheet tray (42). The trays (42, 43) are relatively movable for operatively associating them only one at a time with the second feeder (45). A control is provided for selecting sheet feeding from one of the copy sheet trays (41, 42) and further for controlling the trays such that during duplex copying copy sheets are fed only from the first copy sheet tray (41) and only the buffer tray (43) is operatively associated with the common sheet feeder (45).

Abstract: An image recording apparatus such as a copying machine is capable of both sides recording and overlay recording. In the overlay record mode, after a predetermined format for stock certificates or the like is recorded on transfer sheets, different names or the like are recorded on the format. The apparatus can automatically control the operation sequence without requiring complex mechanisms and procedures.

Abstract: A multi-mode scanner having a first automatic simplex scan mode, a second automatic duplex scan mode, and a third manual simplex scan mode, the scanner including a pair of scan stations for scanning opposing sides of a document, automatic document feeder means for separating a document to be scanned from a document supply and transporting the document to the first one of the scan stations where one side of the document is scanned in the first mode, and thereafter inverting the document and transporting the inverted document to the second one of the scan stations where the opposite side of the document is scanned in the second mode; a platen for manually accepting a document to be scanned in the third mode, and a movable scan carriage positionable in accordance with the mode selected having presettable optics to convey image rays from either the first or second scan station or from the platen to a scanning array.

Abstract: In an automatic document handling system for recirculating a set of document sheets seriatim in a page order to and from the imaging station of a copier for making precollated copy sheet sets, wherein the document handling system has a control system and two document trays, the improvement for higher speed document recirculation for copying on a copier having a high copying rate comprising: an automatic document sheet separating system controlled by said control means for automatically, during the first circulation of the set of document sheets, separating the set of document sheets into two half-sets of alternate page document sheets, odd and even, and restacking the half-sets respectively in the two document trays, and an automatic alternate document sheet cooperative feeding system actuated automatically by the control means on the second and subsequent copying circulations of the document set to feed document sheets alternately and overlapping in time from the two document sheet half-sets in the two docum

Abstract: A camera for photographing the front and back of translating documents (1), having a dual optical system (4-8; 20-22), and one oscillating mirror (9) to demotionalize the images for cine-mode orientation upon a stationary microfilm strip (12) that is advanced during the interval between documents. Two microprocessors (50,56) with supporting memories (53,59) and interface elements (54,58) convert incoming instructions to correlated control information for document and film translation and scanning galvanometer actuation.

Abstract: A copier or similar device is provided with an apparatus for storing and reversing or turning over a plurality of sheets used for two-sided copying. The sheets are stored between adjacent windings of a film or belt member after copying on one side thereof, after which the belt member is reversed to feed sheets one by one to the copying station such that the unprinted side of the sheets may be recorded upon.

Abstract: First side copying is produced on a sequence of copy sheets equivalent to the number required to fill a closed-loop duplex path that returns the sheets to the imaging station. An identical number of second images are transferred to the opposite sides as they are reintroduced from the closed-loop duplex path through the imaging station. The sheet reintroduction is timed so that the next image transfer cycle is used for the first reintroduced sheet. The copy sheets are passed through a fuser station either prior to exit from the machine or as an element of the closed-loop duplex return path.

Abstract: A dual purpose tri-roll inverter is disclosed as part of the normal paper path of a copier and has the capability of taking a sheet into the input side of tri-roll input/output members and continue feeding the sheet by the use of reversible rolls through an out of a channel portion of the inverter for further processing. Alternatively, when reversing of the sheet is required for duplexing, the reversible rolls are reversed by a reverse drive mechanism to propel the sheet while it is still in the inverter back toward the output side of the tri-rolls.

Abstract: In recirculatively precollatively copying a set of plural original documents onto both sides of copy sheets to produce a desired plural number precollated duplex copy sheet sets, by normally copying the documents only once in each copying circulation of the document set onto one side of copy sheets to form a duplexing buffer and copying other documents onto the opposite sides of the buffer copies to form duplex precollated copies, the improvement comprising: counting the number of documents in the document set and determining that the number of documents is only two or three, and in response to the determination, automatically switching the mode of copying of the documents to a higher productivity two or three document set mode in which plural identical consecutive copies are first made from only one document (the first document page) by halting the first copying circulation of the document set to copy only the one document, and forming the buffer from these plural identical copies and then skipping the copyi

Abstract: In recirculatively precollatively copying a set of plural simplex original documents onto both sides of copy sheets to produce a desired plural number precollated duplex copy sheet sets, by normally copying the documents only once in each copying circulation of the document set, and by forming a buffer set of copies of alternate document pages being duplexed which buffer set copies are printed on only one side, and temporarily stored in a duplex store and by copying alternate documents onto the opposite sides of the buffer set copies in proper sequence to form collated duplex copy sets, and wherein said documents are all copied unidirectionally in reverse (N to 1) page order, the improvement comprising: counting the number of documents in the document set and determining that the number of documents is more than three but less than approximately ten, and in response to that determination, automatically switching the mode of copying the document sheets to a higher productivity small document set mode including

Abstract: The copying apparatus comprises a document feeder having transport paths for simplex and duplex originals, and at least two copy transport paths for feeding finished copies from the image transfer means to a collection station. One copy transport path is operable to deliver a duplex copy fed therethrough to the collection station with the first printed side facing downwards, and the other copy transport path is operable to deliver a duplex copy to the collection station with the last printed side facing downwards. The copying apparatus further comprises selection means for selecting the desired type of copies, a detector in the original transport path for determining whether an original fed therethrough is simplex or duplex and control means for regulating the transport of copy sheets dependent on the type of originals detected by the detector and the type of copies selected with the selection means.

Abstract: A recirculating document handling apparatus and method for plurally recirculating duplex original document sheets to and from a stack thereof and to and from the imaging station of a copier for providing duplex document precollation copying, providing selected ones of different, compact, partially shared document recirculation looped paths depending on the copying mode selected with movable path selector means for, in an immediate duplex mode, returning a document sheet in a selected loop path directly but inverted to said copying station for copying the opposite side thereof after copying one side thereof and before returning the document sheet to said stack, and alternatively, in another, common side duplex copying mode, returning a document sheet to said stack inverted after copying one side thereof, using common paths.

Abstract: A print system for duplex printing a plurality of document page images on a plurality of copy sheets includes means for storing print control information which defines the document images. An ink jet printer prints the page images on copy sheets as they are transported past a print station by a transport arrangement defining a closed sheet path. The sheet path is of sufficient length such that a number of copy sheets are transported simultaneously therethrough. A copy sheet inverter receives copy sheets sequentially from the sheet path after the sheets are printed on their first sides and returns them to the sheet path in an inverted orientation prior to printing on the second sides of the copy sheets.

Abstract: An electrophotographic copying apparatus designed to make successive copies from a stack of original documents, automatically, is disclosed herein. To this end, the apparatus utilizes a feeding arrangement configured to act on the stack in a way which successively moves each document onto the copying platen from the bottom of the stack when the latter is placed in a feed tray forming part of the overall arrangement, and thereafter back onto the top of the stack within the tray along a looped path of movement from the tray to the platen and back to the tray. The copying apparatus also includes an assembly located to one side of the feed tray for detecting when the last document in the stack has moved from the tray to the copying platen.

Abstract: Method and apparatus for duplex electrostatic imaging wherein a toner image is transferred and simultaneously fixed to two sides of a receptor medium using high pressure. The first toner image is created on a dielectric image roller and pressure transferred to a transfer roller moving at an identical surface velocity. A second toner image is subsequently formed on the image roller, and the two images are simultaneously transferred and fused to opposite sides of a receptor sheet at the nip. The image roller advantageously includes a hard, very smooth dielectric surface, while the transfer roller has a moderately smooth, compliant surface. The transfer roller surface preferably comprises an engineering thermoplastic or thermoset material characterized by a relatively low coefficient of friction in order to provide high transfer efficiency to the receptor sheet. The duplex imaging apparatus may be incorporated into electrostatic printers and copiers with suitable adaptations in the image generating stages.

Abstract: In a duplicating machine for duplicating images on both sides of copy sheets including a blanket cylinder and an impression cylinder, a mechanism for handling the sheets and re-feeding the sheets back to the impression cylinder for duplex copying. The blanket cylinder has first and second images transferable to the copy sheets. The impression cylinder forms a nip with the blanket cylinder for transferring the copy sheets through the nip. A first gripper on the impression cylinder releasably engages a lead end of a copy sheet and moves the sheet through the nip to transfer the first image on a first side of the sheet. A chain gripper releasably engages the lead end of the sheet transferred thereto by the first gripper and transports the sheet away from the impression cylinder. A swing gripper releasably engages a trail end of the sheet in timed relation with release of the sheet by the chain gripper and re-feeds the sheet back to the impression cylinder.

Abstract: A copy sheet handling arrangement for use in a copying machine for producing duplex copies during a single pass through the processor of the machine. A transfer roller having a lead edge gripping device directs the sheet through the transfer station to receive a first toner image on one side. Reversing transport mechanism returns the sheet to the roller whereat the trailing edge is gripped and the sheet is returned to the transfer station in an inverted orientation to receive a second toner image on the other side thereof.

Abstract: The present invention is a two photoreceptor, single pass duplex reproduction system having a heat insulating prefuser transport device and first and second transfer stations. In particular, the prefuser transport is a pair of cold, toner compacting rolls adjacent the second transfer station for immediate pick up of a copy sheet supporting unfused images on both sides. The compacting rolls tack the unfused images to the copy sheet. The compacting rolls also insulate the photoreceptor from the heat of the fuser and convey the copy sheet immediately to the fuser. The fuser permanently fixes the images onto the copy sheet in one fuser operation. In a preferred embodiment, the fuser rolls operate at a slightly lower peripheral velocity than the compacting rolls. Also, because of the tacking of the image by the cold rolls, the fuser rolls operate at a relatively lower temperature or pressure than normally.

Abstract: An original feed control unit for a copying machine has programming means for variably setting a stop position of an original fed by an original feed device prior to the start of the copy operation. By varying the stop position, the size of the margin formed on the copy paper can be varied. The position of a detector for detecting a jam of the original may be also varied in accordance with the desired size of the margin in order to properly detect a jam.

Abstract: A copier-printer is employed in conjunction with an optical scanner and associated character recognition logic to transmit information contained in a document over a telephone line or other communication line. The copier-printer is used to make a copy of the document which is stored in the duplex tray. When a buffer memory associated with the communication line is ready to receive further information for transmission, the copy is retrieved from the duplex tray and circulated through the copier-printer to the optical scanner. The scanner provides the information from the copy to the buffer memory in a non-coded format except to the extent that the character recognition logic is able to code some or all of the information. The copy is advanced from the scanner to a mailbox in the form of a limited access compartment at the bottom of the collator for the copier-printer.

Abstract: Duplex photoelectrophoretic imaging is implemented with apparatus of the kind having first and second electrodes movable along respective endless paths and cooperatively forming an imaging nip by: (1) first forming a first suspension image on the first electrode and (2) then feeding a copy sheet into the imaging nip and forming a second suspension image on one side of the copy sheet while transferring the first suspension image to the other side of the copy sheet.

Abstract: Various operating modes of the reproduction machine require the use of machine resources such as an automatic document handler tray, a finisher station tray, a dedicated duplex tray and main and auxiliary paper feed trays. The machine will automatically recover for lost or damaged copy sheets with a minimum amount of operator intervention and loss of copy sheets by efficient use of the machine resources. In particular, job recovery occurs at various levels such as pause in processor operation, point to required duplex tray sheet, and point to set boundary. Various levels of job recovery require use of different resources and some malfunctions imply plural levels of job recovery.

Abstract: In an electrophotographic apparatus, a plurality of original sheets are copied onto a plurality of copy sheets in an order permitting assembly of multiple-sheet booklets. The originals are presented to an automatic document feeder by an operator in one order which repeatedly presents the originals to the copier for reproduction in another order. The copies are reduced in size and placed adjacent each other onto both sides of sheets of copy paper in a sequence facilitating booklet assembly. Initially the originals are loaded into the automatic document feeder with the lowest numbered original page presented to the copier first. Odd-numbered originals are copied onto successive halves of copy sheets. When half of the originals have been copied, the copies are reloaded into the copier to permit copying of odd-numbered originals onto halves of the backs of the same copies.

Abstract: A copying machine equipped with a collator for distributing copy sheets fed thereto from a copying machine body into its multiple bins and, upon the lapse of a determined period of time after a copying operation, changing the operating mode from a collation mode or an assortment mode, which may have been selected in the use of the collator, automatically to a normal copying mode. The collator is provided with a bin sheet sensor adapted to detect sheets in the bins thereof. The copying machine is also provided with means for cancelling the automatic mode changing function when the bin sheet sensor detects a sheet or sheets, that is, when the bins of the collator are not entirely empty.

Abstract: Job recovery method and system for generating complete sets of copies and providing billing information with respect thereto. Job recovery is automatically effected after a jam occurs with respect to copy sheets by maintaining counts of sheets reaching the exit pocket and retained in the duplex tray for determining therefrom images lost due to the jam and responsive thereto generating replacement copies. Counts are also maintained for determining when copying of each set is complete and for billing purposes with the count for billing purposes reflecting only delivered copies with no additions being made for replacement copies generated due to lost images.

Abstract: A duplex printing arrangement is provided for printing on both sides of a plurality of rectangular sheets of paper, each of the sheets having a pair of parallel opposite edges which are shorter than the pair of edges perpendicular thereto. Each of the sheets is transported past a printer in a direction parallel to the longer pair of the edges of the sheet. The sheets are printed on a first side as they are moved past the printer with a first edge of the pair of shorter edges being the leading edge. The sheets are thereafter turned end-for-end and moved past the printer for printing a second side of each of the sheets, with the second printing pass being such that the first edge of each of the sheets is again the leading edge.

Abstract: Apparatus for producing images on first and second sides of a copy sheet. Unfixed transferable images formed on an image transfer member are transferred to the opposite sides of a copy sheet brought into transferable relationship with the image transfer member. A copy sheet handling apparatus includes a vacuum member movable in opposite directions. The vacuum member is moved between first and second positions spaced from one another. At the first position, the vacuum member overlies the transfer member and is moved in one direction in synchronism therewith to separate a copy sheet to one side of which a first transferable image has been transferred. At the second position, the vacuum member is aligned with the transfer member and is moved in an opposite direction to bring the second side thereof into transferable relationship with the second transferable image on the transfer member.

Abstract: A xerographic copier having a removable, multifunction paper cassette, the cassette functioning as the copier's paper supply, the copier's exit tray and the copier's single-sheet bypass entry station. The cassette is held at an acute angle to the horizontal, and includes a substantially solid upper wall whose lower portion includes a slot which exposes the paper supply stack's top sheet to paper feed roller means. Paper is fed, one sheet at a time, to a paper path which includes a transfer station and a hot roll fusing station. This paper path traverses a loop, such that the finished copy comes to rest on the solid upper wall of the cassette. The lower portion of this solid upper wall includes a movable paper gate which, when closed, allows multiple copies to be stacked before removal by the operator.

Abstract: First and second original documents are copied on the opposite sides of a copy sheet in superposition in such a manner that the centers of the two copied images on the opposite sides of the copy sheet are coincident with each other. The two copied images are offset from the center of the copy sheet, leaving a blank area at one edge of the copy sheet for binding a number of copy sheets together in book form. The present copying machine is further provided with two sheet cassettes containing copy sheets of different sizes, a device for selecting the desired copy sheet size and intermediate sheet holder for temporarily holding the selected copy sheet between the copy operations of the first and second original documents.

Abstract: An automatic duplicating system in which computer fanfold documents are fed by an automatic handling apparatus having a tractor and drive means for advancing the document across the platen of the processor for the system. An arrangement is provided which will control operation of the processor and the automatic handling apparatus in order to acquire duplex copies of the simplex document. The arrangement includes circuitry and controls which advances the document in a manner wherein a copy of every other frame section is diverted to a holding station and then returned to be reprocessed on its underside with the image of the succeeding frame section.

Abstract: The duplex copying of two-sided originals onto two sides of a copy sheet is accomplished by interspersing images from two successive documents on a multi-image imaging member, specifically with the front-side image of a second document interspersed between the front and rear-side images of a first document. Copy sheet turnover can thus occur during the transfer of the front-side of the second document to achieve an increased "copy-output-rate to electrographic-procedure-speed" ratio.

Abstract: Disclosed is a xerographic copying apparatus 10, by means of which a variety of copying modes may be realized. So, the apparatus enables the simultaneous production of double sided copies from double sided originals, of double sided copies from two single sided originals, and of single sided copies from double sided originals. The apparatus is so designed that the relative order of the originals as well as of the copies is maintained and that no reversing of the originals is necessary after exposure. The apparatus is so designed that collated sets of copies are obtained, although it may also be set to make multiple copies of one original.

Abstract: A system for duplicating images on copy sheets utilizing an impression cylinder. The system provides for transfer of an image to one side of each sheet, and the sheet may then be reversed to locate the sheet on the impression cylinder, trailing edge first. The reversing is in synchronism with a second image whereby this second image may be transferred to the opposite side of each sheet. The impression cylinder is provided with a first gripper for engaging the leading edge of each sheet when the sheet is first fed to the impression cylinder. A second gripper is provided on the impression cylinder for engaging the trailing edge of each sheet, and this second gripper turns around to achieve the reversing action after application of the first image. The first gripper is externally mounted and is movable relative to the impression cylinder whereby the relative positions of the grippers can be changed so that different size sheets can be duplexed.

Abstract: A duplex copying machine has an auto document feeder and is capable of duplex copying from originals having images on one side, originals having images on both sides and combinations of the aforementioned two types. In a preferred embodiment of the duplex copying machine, whether an original has images on one side only or on both sides is detected so as to obtain a duplex copy from a duplex original and a one-side copy from a one-side original.

Abstract: In successively copying a plurality of continuous pages of a book original by means of a copying apparatus adapted to print images of the pages on opposite surfaces of each copy sheet, a printing operation is controlled in such a manner that a series of processes including, illumination of the pages, charging and exposing of a photosensitive drum, developing, fixing and transfer printing of visible images, and ejection of printed copy sheets is automatically performed, if the book original is opened at desired pages and placed on an original placing glass plate of the copying apparatus in a normal condition in which the top of the book original is remote from the operator.

Abstract: Apparatus for producing copies having images on both sides thereof. The apparatus includes a movable image transfer member, and image forming station for producing first and second unfixed transferable images on the image transfer member and first and second image transfer stations for transferring the images from the image transfer member to a copy sheet. Located between the first and second image transfer stations are a plurality of vacuum rollers including at least a first roller located adjacent to the image transfer member and a guide member associated with the vacuum rollers, the vacuum rollers and guide member forming a copy sheet inversion path.

Abstract: Apparatus for producing duplex copies and including a movable image receiving member for receiving first and second unfixed transferable images, an image transfer device for transferring the transferable images to the first and second sides of a copy sheet and copy sheet handling apparatus. The copy sheet handling apparatus includes a copy sheet vacuum pick-off member located adjacent to the image receiving member and a mechanism for moving the pick-off member in synchronism with the image receiving member through a closed loop path to initially vacuum contact a copy sheet in contact with the image receiving member after transfer of the first unfixed image to the first side of the copy sheet, to remove and reorient the copy sheet while the first image is unfixed, and to register the second side of the copy sheet with the second transferable image on the image receiving member at the image transfer device.

Abstract: A system for duplicating images wherein a copy sheet is delivered to a first gripper of an impression cylinder. A first image is transferred to one side of each sheet, and each sheet is then released by the first gripper and delivered to a reversing means. A second gripper includes means for engaging the trailing edge of each sheet and the sheets are thus re-fed to the impression cylinder by this second gripper, trailing edge first. The re-feeding is in synchronism with the second image whereby this second image is transferred to the opposite side of each sheet. The second gripper is provided with inverting means to accommodate the re-feeding. In addition, separate gripper means are provided on the second gripper for engaging the trailing edge of a succeeding sheet whereby the second gripper simultaneously engages the trailing edge of one sheet and the formerly trailing edge of a previously introduced sheet.

Abstract: Apparatus for producing duplex copies including an image transfer member movable at a first velocity and having first and second unfixed transferable images; and image transfer apparatus for transferring the first and second images to the first and second sides respectively of a copy sheet. A copy sheet turnover member is also provided adjacent to the image transfer member. The turnover member is movable in a first direction to separate a copy sheet to the first side of which the first image has been transferred. The turnover member is then movable in a second opposite direction to turnover the copy sheet while the first image is unfixed and to register the second side of the copy sheet with the second image on the image transfer member at the image transfer apparatus.

Abstract: Apparatus operable in duplex and simplex modes for making copies having images on one or both sides thereof. In the duplex mode, first and second transferable images are formed on a movable image transfer member by an image forming device, a copy sheet is supplied from a copy sheet supply into transfer relationship with the transfer member and the first image is transferred to a first side of a copy sheet at a first image transfer station. A vacuum drum located adjacent to the transfer member is rotated in a first direction to separate the copy sheet from the transfer member. After the copy sheet has been separated, the drum is rotated in a second opposite direction to invert the copy sheet while the first image is unfixed and to register the second side with the second transferable image on the transfer member at a second image transfer station.

Abstract: Simplexed copy sheets lost during a partially completed pre-collation duplex copying run are automatically replaced in proper serial order into the partial copy set in the duplex buffer set tray by lifting the partial buffer copy set stack up with a false tray bottom and inserting replacement (make-up) simplex copies under the buffer set, then the false bottom is lowered and the duplex copying run, is continued, feeding out sheets from the duplex tray with the existing bottom feeder, and feeding the subsequent simplex copies in normally to the top of the buffer set stack. Thus, the copies in the buffer set do not have to be thrown away or reorganized by the operator when a copier jam occurs.

Abstract: A flow, or rotary type, microfilm recording apparatus for filming documents having a document transport means to move documents past an aperture area. A combining mirror, camera mirror, side mirror and camera lens are all mounted in a common plane. The plane of the mirrors is essentially perpendicular to the plane of the document as it passes through the filming aperture area. Either or both sides of the document can be film simultaneously. The possibility of having multiple reflected images on the film is eliminated by tilting one of the mirrors.

Abstract: A system for duplicating images wherein a copy sheet is delivered to an impression cylinder. A first image is transferred to one side of each sheet. Each sheet is then removed from the impression cylinder, delivered to a reversing means and then to the impression cylinder, trailing edge first. The re-feeding is in synchronism with the second image whereby this second image is transferred to the opposite side of each sheet. The impression cylinder is provided with a first gripper for engaging the leading edge of each sheet when the sheet is first fed to the impression cylinder. A second gripper is provided on the impression cylinder for engaging the trailing edge of each sheet. The impression cylinder thus simultaneously carries the sheets as the sheets are moved through the stages of operation.

Abstract: An apparatus for producing duplex copies. First and second unfixed images are transferred to opposite sides of a copy sheet before fixing of either image to the copy sheet. The first and second unfixed images may be electroscopic images sequentially formed on a photoconductor by electrophotographic techniques. The first unfixed electroscopic image is transferred from the photoconductor to a first side of a copy sheet, the sheet is inverted while the first image thereon remains unfixed, the second unfixed electroscopic image is transferred to the second side of the copy sheet, the copy sheet with the first and second unfixed images thereon is then transported to a fixing station.

Abstract: In the method, two originals are placed side-by-side on the contact glass of an electrophotographic duplex copying machine and are scanned successively, in a single scanning operation, by the exposure optical system of the machine to form respective successive images on a photoconductive drum rotated past an image transfer device. Two transfer sheets are fed successively, with a short interval therebetween, from a primary supply device for transfer sheets, past the image transfer device in synchronism with the image formation on the drum, to provide duplex copies, having images in the same relation as that of the two originals, in a single copying cycle or process. By utilizing a secondary sheet supply device and a suitable switching device, images can be provided on both sides or surfaces of a transfer sheet or sheets. The duplex copying apparatus includes a novel sheet feed device effective to stack transfer sheets neatly.

Abstract: An electrostatographic type copying or reproduction machine for making duplex as well as simplex copies. To enable offset margins on the original documents being copied to be matched on both sides of a duplex copy, a control is provided which when actuated moves the second side image into alignment with the first side image.