EP0108840B1 - Higher productivity recirculative document copying - Google Patents

Higher productivity recirculative document copying Download PDF

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Publication number
EP0108840B1
EP0108840B1 EP19820304964 EP82304964A EP0108840B1 EP 0108840 B1 EP0108840 B1 EP 0108840B1 EP 19820304964 EP19820304964 EP 19820304964 EP 82304964 A EP82304964 A EP 82304964A EP 0108840 B1 EP0108840 B1 EP 0108840B1
Authority
EP
European Patent Office
Prior art keywords
document
copying
duplex
copy
documents
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19820304964
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German (de)
English (en)
French (fr)
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EP0108840A1 (en
Inventor
Susan Jean Pels
Donald William Schaeffer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
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Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Priority to EP19820304964 priority Critical patent/EP0108840B1/en
Priority to DE8282304964T priority patent/DE3276199D1/de
Priority to US06/448,655 priority patent/US4468114A/en
Priority to US06/448,654 priority patent/US4466733A/en
Priority to IN950/CAL/83A priority patent/IN159572B/en
Priority to IN949/CAL/83A priority patent/IN159571B/en
Priority to CA000435724A priority patent/CA1208689A/en
Priority to JP58170530A priority patent/JPS5974574A/ja
Priority to EG58183A priority patent/EG15983A/xx
Publication of EP0108840A1 publication Critical patent/EP0108840A1/en
Application granted granted Critical
Publication of EP0108840B1 publication Critical patent/EP0108840B1/en
Priority to HK87488A priority patent/HK87488A/xx
Expired legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/60—Apparatus which relate to the handling of originals
    • 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
    • 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
    • G03G2215/00172—Apparatus for electrophotographic processes relative to the original handling
    • G03G2215/00177—Apparatus for electrophotographic processes relative to the original handling for scanning
    • G03G2215/00181—Apparatus for electrophotographic processes relative to the original handling for scanning concerning the original's state of motion
    • G03G2215/00185—Apparatus for electrophotographic processes relative to the original handling for scanning concerning the original's state of motion original at rest

Definitions

  • the present invention relates to an improved system for providing more efficient recirculatory precollation copying of sets of original document sheets of special conditions of small document sets.
  • the exemplary copier and document recirculating and inverting apparatus disclosed herein is also disclosed in- US-A-4,278,344.
  • An advantage of the present system is that it may be used with that disclosed apparatus without substantial modification.
  • the present system is not limited to that apparatus or application and is usable with various other recirculative document handlers and copiers.
  • sheet generally refers to conventional sized flimsy sheets of paper, plastics, or other conventional or typical individual image substrates (original or copy), and not to microfilm or electronic images which are generally much easier to manipulate.
  • document or document page in the claims here, unless otherwise specified, may also be read or encompass laser printed or otherwise electronically generated, stored, or rearranged images.
  • page here generally refers to one side or “face” of a sheet or the image thereof.
  • a “simplex” document or copy sheet is one having its page and image on only one side or face of the sheet, whereas a “duplex” document or copy sheet has pages on both sides.
  • duplex copying may be more specifically defined into several different known copying modes.
  • duplex/ duplex both sides (both pages) of a duplex document sheet are copied onto both sides of a copy sheet.
  • duplex/simplex both sides of a duplex document are copied onto one side of two successive copy sheets.
  • implex/duplex the two page images of two successive simplex document sheets are copied onto the opposite sides of a single copy sheet.
  • non-duplex copying i.e. "simplex/simplex” copying, one side of each simplex document is copied onto one side of each copy sheet.
  • two-sided copying may be referred to as "backing-up” rather than duplex copying.
  • a commercially desirable precollation document handling system should compatibly provide all of these copying modes, although "duplex/simplex" need not be provided.
  • the present system particularly relates to a "simplex/duplex" precollation copying system which is fully compatible, with the same apparatus, with all of the other said copying systems.
  • RDH is an abbreviation for an automatic recirculating document handler, in which document sheets are automatically fed from a stack, copied and returned thereto, normally for a precollation copying system.
  • the present system is particularly suited for a precollation (multiply recirculated) document copying system, but is also compatible with non-precollation copying with the same apparatus.
  • Precollation, or collation copying is a known desirable feature for a copier, which provides a number of important advantages.
  • precollation copying any desired number of precollated copy sets may be made by making a corresponding number of recirculations of the original document set in collated order past the copier imaging station and copying each document page only once each time it circulates past the imaging station.
  • the copies automatically exit the copier in precollated sets, and thus do not require subsequent sorting in a sorter or collator. On-line finishing and/or removal of completed copy sets may thus be provided while further copy sets are being made from the subsequent circulations of the same document set.
  • precollation copying systems a disadvantage of precollation copying systems is that the documents must all be repeatedly circulated, and copied in a predetermined order, by a number of circulations equivalent to the desired number of copy sets.
  • increased document handling is necessitated for a precollation copying system, as compared to a post-collation copying system.
  • the copy sheets must normally also be recirculated once in the copying path in coordination with the document set recirculation in order to print images on both sides thereof. Therefore, maximizing document handling automation and copying cycle efficiency is particularly important in precollation copying.
  • first copy out time the time delay from the initiation of copying until the first copy set is completed.
  • a post-collation copying system plural copies are made at one time from each document page and collated by being placed in separate sorter bins.
  • the document set need only normally be circulated or manually or semi-automatically fed to the imaging station once and multiply copied to fill the bins of the copy sheet sorter or collator with the corresponding number of copy sets.
  • the number of copy sets which can be made in one document circulation is limited by the number of available bins.
  • a sorter adds space and complexity and is not well suited for on-line finishing.
  • post-collation copying and manual document placement are desirable in certain copying situations to minimize document handling.
  • a major disadvantage of such N-to-1 document feeding and copying order is that the copier controller does not know what document is being fed on the first circulation, since the last page is fed first. Not knowing whether the documents being fed are odd or even, and duplexing accordingly, has distinct disadvantages for making duplex copies. If the number of original document pages is odd, the last duplex copy sheet will be blank on one side. This problem has lead to simplex/duplex copying with either precounting of the entire document set before copying in a non-copying circulation and/or selective use of a copy sheet inverter in the copy sheet path and other disadvantages, as explained more fully in S. Patents 4,330,197,4,278,344 and 4,166,614.
  • Such precount cycles and/or selective use of a copy sheet inverter adversely affect the system reliability by requiring extra handling of the document set and running the copy sheets past additional deflector fingers and in and out of an inverter, with extra or different handling and timing.
  • the precount cycle may decrease the perceived productivity of the system by cycling the document handler without imaging the originals at the beginning of copying when it is most noticeable and when there is no copy sheet output finishing or handling to occupy the operator's time.
  • N-to-1 document recirculation has been commercially utilized in spite of these disadvantages because it is suitable and conventional for a "racetrack" or over-platen loop circulation path, in which the documents are recirculated to and from a document stack located over the copier platen, as shown in the cited references.
  • Simplex documents are fed from one edge of the stack to the same side or edge of the platen underneath the stack and back from the opposite edge of the platen to the opposite edge of the stack, and therefore may be stream fed unidirectionally over the platen, feeding one document on while the prior one is feeding off.
  • the document path has a 180° loop turn at each side of the platen which is generally a short path. With such a shorter and unidirectional "racetrack" loop path length, document transport speeds can be lower and two-or three-sheet document set handling with less skipped copy cycles can be achieved more easily than with most non-racetrack systems.
  • an odd number of simplex sheets will normally also have a corresponding odd number of page images.
  • a set of duplex sheets regardless of the sheet count, may have an odd or even number of pages. If there is an odd number of pages in the set of duplex sheets, the reverse side of the last sheet will normally be blank (empty).
  • US-A-4,078,787 is noted as to copying a single simplex document in an RDH without any circulation (since single page copy sets cannot, of course, be collated).
  • US ⁇ A ⁇ 4,093,372 teaching an RDH copying system which switches from a precollation to a post-collation mode of copying automatically in response to operator selection of a preset (larger) number of desired copy sets.
  • non-precollation duplex copying may be done by first making in the copier processor a "buffer set" comprising a plurality of simplexed copy sheets (printed only on their first sides).
  • the buffer set sheets are temporarily stored, preferably in a duplex buffer tray, and then fed back through the same copying processor for a second pass printing of the proper opposite page on their opposite sides.
  • Such systems may be referred to as sequential or dual pass duplexing systems, and are used, for example in the "Xerox" "4000" (without an RDH) and in the Xerox 9400 copiers. Examples of such systems for handling the copy sheets being duplexed are shown in US-A-3,615,129 and 3,645,615. In such non-precollation duplexing systems all the sheets in the buffer set are normally identical copies of the same, single, document page.
  • each buffer set has one copy of each different document page, and thus their order and orientation must be maintained and coordinated with the document pages to be printed on their opposite sides.
  • the references cited there teach that two buffer sets may be provided in the special situation of bidirectional copying where copies are made in two different orders (1-to-N then N-to-1) in a special document feeder and copier.
  • These cited references are US-A-4,116,558 and 4,172,655.
  • These are different (different order) buffer sets as are those in IBM Technical Disclosure Bulletin Vol. 22, No. 7, pp. 2657-2659, Dec. 1979.
  • control of all of the exemplary sheet handling systems disclosed herein may be accomplished by conventionally activating them by signals from the controller in response to simple programmed commands and switch inputs from the copier console selected by the operator, such as selecting the number of copies, selecting simplex or duplex copying, selecting whether the documents are simplex or duplex, etc.
  • These signals may actuate conventional electrical solenoid or cam-controlled sheet deflector fingers and drive motors or their clutches in the selected steps or sequences as programmed.
  • Conventional sheet path sensors or switches and ball bars, connected to the controller may be utilized for counting and keeping track of the positions of documents and copy sheets, as is well known in the art, and taught in the above and other patents and products.
  • Known precollation copying systems utilize such conventional microprocessor control circuitry and connecting switches for counting the number of document sheets as they are recirculated, counting the number of completed document set circulations, and thereby controlling the operation of the document and copy sheet feeders and inverters, etc.
  • the present invention desirably overcomes or reduces various of the above-discussed problems.
  • a general disclosed feature herein is to control the sequence of document and copy sheet feeding and copying so as to provide more efficient, more rapid, precollation copying with a recirculating document handling system of a three document set.
  • a further general disclosed feature is to change the mode of precollation copying for small copy sets depending on and controlled by the number of pages for increasing copying efficiency.
  • the present invention provides a method of copying a set of original documents onto both sides of copy sheets, as claimed in the appended claims.
  • N-to-1 order recirculating document handler (RDH) 20 disclosed here, individual original document sheets are sequentially fed from a stack of document sheets placed by the operator face-up in normal forward collated order in the document stacking and holding tray 22, i.e. with page 1 on the top of the stack.
  • Document sheets are fed from the bottom of the stack seriatim to the imaging station 23, which is the conventional copying platen of the copier 10, to be conventionally imaged onto a photoreceptor 12 for the production of copies in a generally conventional xerographic manner.
  • the documents are stacked initially, and also restacked automatically during each circulation, in the tray 22 over the platen 23.
  • the document handler 20 has conventional switches or other sensors such as 24 for sensing and counting the individual documents fed from the tray 22, i.e. counting the number of document sheets circulated.
  • the document feeder 20 is adapted to feed the documents sequentially, which may be various conventional sizes and weights of sheets of paper or plastics displaying information indicia to be copied on one or both sides, e.g. printed or typed letters, drawings, prints, photographs, etc.
  • a bottom feeder 28 feeds the bottom-most document sheet, on demand by the controller, from the stack through one of two selected feed paths described below to a platen transport 30 which moves the document into a registration position, against a registration gate 32, over the copier platen 23, where the side of the document facing the platen 23 is copied.
  • each document is selectably inverted or not inverted as it is fed from the tray 22 to the imaging station 23 through one of two paths selectable by the controller.
  • the two paths here are provided by a selectably reversable sheet drive roller (inverting roller) 40 and a selectable position gate or deflector 60 in the document path.
  • Each document sheet is fed initially from tray 22 around the outside of the roller 40. If the document path is continued around roller 40, it is fed invertedly through a first (simplex document) path 54 onto the platen 23.
  • the decision gate 60 in the document path here is adjacent the entrance to roller 40 and comprises pivotable, normally raised, deflector fingers which may be lowered after the trail edge of the document has passed this gate. (Switch 24 or another switch can sense the trail edge and start a count of sufficient time for it to pass). Subsequent actuation of the gate 60, together with coordinated reversal of the roller 40, causes the further recirculatory movement of the document to reverse and pass through a second and different transport path 58 to the platen for copying. In the art this is called an "inverter" even though the document is not inverted at this point, as described below.
  • the second transport path 58 provides no sheet inversion between the stack and the platen, whereas the first transport path 54 inverts the document sheet (once) between the stack and the platen.
  • the path 58 provides for duplex document inversion, for copying both sides of the duplex document set as described in detail in the US-A-4,278,344.
  • the first inverting transport path 54 transports the documents unidirectionally and without reversal fully around the roller 40 onto the platen 26.
  • the orientation or facing on the copy platen 23 of documents fed through the simplex path 54 is inverted from the previous orientation of those documents in the tray 22.
  • This document return path has one sheet inversion, provided by feeding the documents around a second, but non-reversing, inverting roller document feeding system 42, which also returns the documents to restack on the top of the stack in tray 22.
  • the document sheets are presented to the imaging station 23 of the copier 10 in N-to-1 or conventional reverse serial page order. They are multiply recirculated between the stacked set of the document sheets and the imaging station, and copied only once on one side per circulation at the imaging station, by feeding the document sheets seriatim from the bottom of the stack to one side of said imaging station and then returning the document sheets from the opposite side of said imaging station to the top of said same stack, in a recirculatory loop path, in said multiple circulations.
  • the set of simplex document sheets is stacked in proper page order, face-up, with the first page on the bottom of the stack, in the stacking position 22 overlying the imaging station 23.
  • inverter mechanisms utilizing a sheet reversal path can increase reliability problems, particularly if it must be frequently used for multiple recirculations of a document set or used for many of the copy sheets.
  • the present system does not require the use of the duplex document transport path 58 for simplex documents, nor does it require frequent use of a copy sheet inverter e.g. 116.
  • the use of any inverting path is normally much less than the total number of copy sets made with this system.
  • this system is fully compatible with duplex document recirculation without increasing the number of inverter operations for the duplex documents either.
  • the exemplary copier 10 processor and its controller 100 will now be described in further detail.
  • the copier 10 conventionally includes a xerographic photoreceptor belt 12 and the xerographic stations acting thereon for respectively charging 13, exposing 14, developing 15, driving 16 and cleaning 17.
  • the copier 10 is adapted to provide duplex or simplex precollated copy sets from either duplex or simplex original documents copied from the same RDH 20.
  • Two separate copy sheet trays 106 and 107 are provided for feeding clean copy sheets selectably from either one. They are known as main tray 106 and auxiliary tray 107.
  • the control of all sheet feeding is, conventionally, by the machine controller 100.
  • the controller 100 is preferably a known programmable microprocessor, exemplified by the art cited above, which conventionally also controls all of the other machine steps and functions described herein including the operation of the document feeder, the document and copy sheet gates, the feeder drives, etc. As further disclosed in those references, the controller 100 also conventionally provides for storage and comparison of the counts of the copy sheets, the number of documents recirculated in a document set, the number of copy sets selected by the operator through the switches thereon, time delays, jam correction control, etc.
  • the copy sheets are fed from a selected one of the trays 106 or 107 to the xerographic transfer station 112 for the conventional transfer of the xerographic toner image of a document page to the first side of the clean copy sheet.
  • the copy sheets here are then fed by a vacuum transport to a roll fuser 114 for the fusing of the toner image thereon.
  • the copy sheets are fed onto a gate or fingers 118 which functions as an inverter selector. Depending on the position of the gate 118 the copy sheets will either be deflected into a sheet inverter 116 or bypass the inverter 116 and be fed directly on to a second decision gate 120.
  • the second decision gate 120 then either deflects the sheets directly into an output tray 122 or deflects the sheets into a transport path which carries them on without further inversion to a third decision gate 124.
  • This third gate 124 either passes the sheets directly on without inversion into the output path 128 of the copier, or deflects the sheets into a duplex inverting roller transport 126.
  • the inverting transport 126 inverts and then stacks copy sheets to be duplexed in a duplex tray 108 when the gate 124 so directs.
  • the duplex tray 108 provides intermediate or buffer storage for those copy sheets which have been printed on one side and on which it is desired to print subsequently an image on the opposite side thereof, i.e. the sheets being duplexed. Because of the sheet inverting by the roller 126, these buffer set copy sheets are stacked into the duplex tray 108 face-down. They are stacked in this duplex tray 108 on top of one another in the order in which they were copied.
  • the previously simplexed copy sheets in the tray 108 are fed seriatim by its bottom feeder 109 from the duplex tray back to the transfer station 112 for the imaging of their second or opposite side page image, through basically the same copy sheet path (paper path) as is provided for the clean (blank) sheets from the trays 106 or 107.
  • paper path the same copy sheet path
  • this copy sheet feed path here between the duplex tray 108 feeder 109 and the transfer station 112 has an inherent inversion which inverts the copy sheets once.
  • the inverting roller 126 because of the inverting roller 126 having previously stacked these buffer sheets printed face-down in the tray 108, they are presented to the photoreceptor 12 at the transfer station 112 in the proper orientation, i.e.
  • the now duplexed copy sheets are then fed out through the same output path through the fuser 114 past the inverter 116 to be stacked in tray 122 or fed out past the gate 124 into the output path 128.
  • the output path 128 transports finished copy sheets (simplex or duplex) either to another output tray as shown in Fig. 2 or, preferably, to a finishing station where the completed precollated copy sets may be separated and finished by on-line stapling, stitching, glueing, binding, and/or off-set stacking (shown in Fig. 2).
  • the output path 128 may connect to a sorter.
  • the sorter can have an inherent sheet path inversion if alternative 1-to-N order document placement is used.
  • the exemplary conventional inverter 116 operates by the gate 118 deflecting a copy sheet face-down into the first or lower nip of the illustrated three-roll inverter, which drives the sheet into the inverter chute.
  • the copy sheet's movement is then reversed within the inverter chute by known or suitable sheet reversing means, e.g., further rollers, or resilient rebound members, and the copy sheet is then reversed and driven out of the inverter 116 through the second or upper nip of the same three-roll inverter directly toward the gate 120.
  • the convex shape of the inverter chute acting on the beam strength of the sheet causes the sheet trail edge to flip up toward this second nip.
  • the copy sheet output from the inverter 116 to the gate 120 is thereby last-printed-face-down. Note that the inverter 116 is positioned at a corner of an otherwise inherent 90° paper path inversion as described above.
  • any other suitable sheet inverter may be utilized, and may be provided at different positions in the copy sheet output path.
  • Examples of similar or substitutable sheet inverters are disclosed in US-A-2,901,246; 3,337,213; 3,416,791; 3,523,687; 3,856,295; and 4,044,285.
  • Fig. 2 illustrates proper collated output copy sheet stacking, i.e. face-up for N-to-1 page order copying.
  • Collated duplex copying output presents particular output collation difficulties and requirements, depending on which side is printed last, etc. As noted above, a lower and odd, document page number must be on one side of a duplex copy sheet.
  • each sheet to be duplexed is inverted once at the duplex tray input 126, a second time in the return path to the transfer station 112, and a third time in the path from the transfer station 112 to the output 128, to exit last-printed-face-up.
  • the second sides printed are the odd sides
  • a N-to-1 output may be stacked with these last-printed odd sides facing up as in Fig. 2 without using inverter 116.
  • the inverter 116 path is illustrated in Fig. 2 as an alternative in dashed lines. However, as otherwise dicussed herein, it is normally bypassed (path I') here by gate 118. This same path I' in Fig. 2, normally avoiding the inverter 116, is also used for simplex copies, which is an important advantage.
  • the first document fed is page N and the first (Nth) duplex copy sheet will be the one requiring special duplex processing, i.e., having a blank back side when N is odd. Since this Nth copy sheet is fed first it is not known whether the Nth document page is odd or even until after the documents have all been counted in the first document set circulation, which reduces the efficiency of the system.
  • Pre-printed, e.g. letterhead, copy sheets present a special problem. They cannot have a first even page printed on the front (pre-printed) side. That is, page 1 must be on the letterhead side and properly oriented with the pre-printing orientation. This is an additional complication for duplex copies.
  • For said simplex/duplex copying by loading letterhead or other special paper face-up in the trays 106 and 107 and copying odd page documents on the first pass, the odd pages will be properly printed on the front or letterhead sides of the letterhead copy sheets here, since the copy paper path here contains one inversion between trays 106 and 107 and the transfer station 112. Then on the next circulation these duplex copy sheets will have even pages properly printed on their back sides.
  • a duplex/duplex copying system compatible with the simplex/duplex system disclosed herein, can be provided as disclosed in the US-A-4,278,344. Briefly, the duplex documents may also be loaded face-up and copied in N-to-1 order.
  • the duplexing system disclosed therein is to copy only one side of each duplex document sheet in each circulation, storing the buffer set copies thereof in the duplex tray 108, then inverting the duplex document sheets during a circulation, and copying all of the opposite sides of all the document sheets onto the opposite sides of the buffer set copy sheets fed back from the duplex tray 108.
  • the controller 100 is instructed by its software to provide this copying sequence in response to the "duplex document" switch on its console or in the RDH unit having been actuated by the operator. Since duplex/simplex copying is not provided, this same duplex document switch can also automatically select the duplex copy mode.
  • this simplex/duplex system here is fully compatible with the special duplex/duplex system disclosed in the US-A-4,278,344 in which the inverter (40, 60) path 58 is utilized only intermittently between successions of plural copying circulations of the duplex documents, i.e. in which plural buffer sets are placed in the duplex tray 108 and the document inverter operation path 58 is utilized only during single document circulations at the beginning or end of a sucession of circulations, after the document set has been circulated by a number of times (not exceeding the sheet capacity of the tray 108) thereby significantly reducing the number of circulations requiring the operation of the document inverter, except for very large document sets.
  • the four duplex documents could be circulated 25 times through path 54 at the beginning of copying to form 25 four-sheet buffer sets in the tray 108.
  • These four copy sheets would respectively bear pages 7, 5, 3, 1.
  • the duplex document set would be circulated once through the path 58.
  • the document set would be circulated again through the path 54 for the next 24 circulations.
  • the pages 6, 4, 2, blank would be printed in that order 25 times on the back of the buffer set sheets fed from the duplex tray 108 until all 25 duplex copy sets have been printed and exited. Then this sequence would repeat until the requested number of copies were completed. (Assuming that more than 25 copy sets had been requested by the operator through the appropriate switch selection in the controller 100).
  • the horizontal lines labeled "Doc. on Platen” indicate which of the document pages is on the platen at that point in time (e.g. 1 or 2 in Table I).
  • the symbol “m” designates a clean copy sheet fed from either the main or auxiliary sheet feeder (trays 106 or 107), while “d” designates a buffer set copy sheet fed from the duplex feeder (tray 108).
  • the "X” indicates a flash exposure in that pitch (vertical column) of the document page shown verticallythereabove in the "Doc. on Platen” line onto the copy sheet shown thereabove in the "Paper Feed” line.
  • each asterisk designates one skipped pitch or cycle i.e. a time delay.
  • the repeated "Machine Pitch/Cycle" numbers 1 through 9 and 10 (ten pitches) in the top line of each table are each a preset time period corresponding to one sheet path space or pitch and are each equated to one document cycle, i.e. one document feed or one pause in document feeding.
  • This pitch or cycle count is repeated at each 10 pitches merely for tabulation space convenience (to use orrly single digits).
  • the number of circulations of the entire document set is the number of repetitions of all the document page numbers in the "Doc. on Platen" lines (reading across). This is also illustrated in the "Doc. Circ.” line, which, however, is shown only for the highest set number shown in each table, e.g. only for the 14-page document example in Table I. Also for clarity the "Buffer Set” line is shown only for the last example in each table, to illustrate the formation and depletion of plural buffer sets of the copy sheets for that one case.
  • the first copy is made (of page 1) only on the 4th pitch, which is at the end of the second document set circulation. Then, on the 4th up to 17th pitch, up to 14 plural identical copies are made of page one, corresponding to the number of copy sets being made, rather than circulating the documents, contrary to conventional precollation copying, to form up to 14 plural buffer sets consisting only of page 1's. For more than 14 requested copy sets the pattern is repeated rather than increasing the size of the buffer set beyond 14 sheets.
  • copy page 2 first rather than page 1 in the second set circulation (i.e. reverse steps 2 and 3 above) (noting that for this 2-page original document set that the duplex set copies thereof have only a single sheet in each set, and therefore their output orientation could be either face-up or face-down). (i.e. with a single sheet output set, no output collation is required).
  • odd page first copying may be required for letterhead, edge binder hole or other output or copy sheet restraints even for single sheet two-page output sets.
  • Fig. 2 of the drawing The example shown schematically in Fig. 2 of the drawing is for said three-page original document set system of Table II.
  • the Fig. 2 example shows three completed copy sets in the output tray at the right-hand side of Fig. 2 and a full buffer tray 108 set of four sheets, i.e. a running situation in which the operator has requested four of more copy sets and only three have been completed at the point in time illustrated.
  • the duplex tray 108 would be empty, having been depleted as shown in the Table II.
  • Table III illustrates the algorithm for a four-document sheet simplex document set. Examples in Table III are provided for one, two and four copy set runs of the four document sheets. For only the four set example, additional lines are shown for the document set circulations and buffer sets.
  • the most efficient buffer comprises two-buffer sets (each here containing copies of pages 1 and 3).That is, the complete (full) buffer set in the duplex tray is a stack of four sheets copied on their downward facing sides with pages 3, 1; 3, 1. These two buffer sets are initially formed on the second and third document set circulations, and depleted out on the last and next to last document circulations. Note that there are no plural consecutive copies of any document page, and that the individual buffer sheets are not identical or interchangeable, but the two complete buffer sets are.
  • Tables IV and V are respectively for the cases of five-document and six-document sets. They are processed similarly to the four-document set of Table III. However, the Table IV case with five documents has an odd Nth page requiring special processing as in Table 11.
  • the first page which is the second and last fed document sheet, is copied a plural number of times in succession, dependent on the number of copy sets being made in the first copying circulation (i.e. the first document circulation after the initial non-copying counting circulation) to make up a plural sheet buffer of an equal number of said page 1 copies. Then on the last copying circulation or circulations for the last copy set this plural sheet buffer is depleted (emptied out) by plurally copying the other sides thereof (with equal plural copies of page 2).
  • the maximum number of plural copies of page 1 placed in the buffer tray in the second (first copying) document circulation is four ("1111") for this processor example. However, this could be three or even two, for a shorter paper path.
  • the disclosed copier and document handler unit can automatically handle a wide latitude of original document sets with a minimum of operator interaction.
  • the operator need only drop the set of documents to be copied into the open loading tray 22 on top of the RDH 20, program the desired number of copies to be made in the controller 100 switches, indicate if duplex documents rather than simplex have been loaded (by pressing a button connected to the controller 100), and then initiating the copying run. sequence by pressing the conventional "start print" button on the controller.
  • N-to-1 simplex document duplex copy precollation copying system embodiment is preferred, it will be appreciated that this embodiment is but one example, and various alternatives, modifications, variations or improvements thereon may be made.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Conveyance By Endless Belt Conveyors (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Counters In Electrophotography And Two-Sided Copying (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP19820304964 1982-09-21 1982-09-21 Higher productivity recirculative document copying Expired EP0108840B1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP19820304964 EP0108840B1 (en) 1982-09-21 1982-09-21 Higher productivity recirculative document copying
DE8282304964T DE3276199D1 (en) 1982-09-21 1982-09-21 Higher productivity recirculative document copying
US06/448,654 US4466733A (en) 1982-09-21 1982-12-10 Higher productivity recirculative document copying
US06/448,655 US4468114A (en) 1982-09-21 1982-12-10 Higher productivity recirculative document copying
IN950/CAL/83A IN159572B (ja) 1982-09-21 1983-07-29
IN949/CAL/83A IN159571B (ja) 1982-09-21 1983-07-29
CA000435724A CA1208689A (en) 1982-09-21 1983-08-31 Higher productivity recirculative document copying
JP58170530A JPS5974574A (ja) 1982-09-21 1983-09-14 再循環式原稿複写装置
EG58183A EG15983A (en) 1982-09-21 1983-09-21 Higher productivity recirculative document capying
HK87488A HK87488A (en) 1982-09-21 1988-10-27 Higher productivity recirculative document copying

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19820304964 EP0108840B1 (en) 1982-09-21 1982-09-21 Higher productivity recirculative document copying

Publications (2)

Publication Number Publication Date
EP0108840A1 EP0108840A1 (en) 1984-05-23
EP0108840B1 true EP0108840B1 (en) 1987-04-29

Family

ID=8189774

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820304964 Expired EP0108840B1 (en) 1982-09-21 1982-09-21 Higher productivity recirculative document copying

Country Status (7)

Country Link
EP (1) EP0108840B1 (ja)
JP (1) JPS5974574A (ja)
CA (1) CA1208689A (ja)
DE (1) DE3276199D1 (ja)
EG (1) EG15983A (ja)
HK (1) HK87488A (ja)
IN (1) IN159571B (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60263167A (ja) * 1984-06-11 1985-12-26 Fuji Xerox Co Ltd 複写機の制御方法
CH664138A5 (de) * 1984-10-12 1988-02-15 Grapha Holding Ag Fliessfertigungsstrecke fuer druckerzeugnisse.
US4693464A (en) * 1984-12-20 1987-09-15 Laurel Bank Machines Co., Ltd. Apparatus for arranging the obverse and reverse sides of the bills or the like
JPS6247655A (ja) * 1985-08-28 1987-03-02 Toshiba Corp 両面印刷方法
US4660963A (en) * 1985-12-30 1987-04-28 Xerox Corporation Auto duplex reproduction machine
JPS63313172A (ja) * 1987-06-16 1988-12-21 Canon Inc 両面記録装置の制御方法
US4782363A (en) * 1987-09-17 1988-11-01 Xerox Corporation Copying system for on-line finishing
NL8800659A (nl) * 1988-03-17 1989-10-16 Oce Nederland Bv Werkwijze en kopieerapparaat voor het op volgorde op beide zijden van ontvangstbladen kopieren van originelen.
US5192976A (en) * 1989-11-05 1993-03-09 Canon Kabushiki Kaisha Sheet original feeding apparatus with detachable auxiliary feeder
US5132741A (en) * 1989-11-05 1992-07-21 Canon Kabushiki Kaisha Sheet original feeding apparatus and image forming system
US5159395A (en) * 1991-08-29 1992-10-27 Xerox Corporation Method of scheduling copy sheets in a dual mode duplex printing system

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
US4212457A (en) * 1978-03-27 1980-07-15 Xerox Corporation Pre/post-collation copying system
CA1161867A (en) * 1979-07-16 1984-02-07 Richard E. Smith Recirculating documents duplex copier
US4278344A (en) * 1979-08-31 1981-07-14 Xerox Corporation Recirculating duplex documents copier
JPS5637551A (en) * 1979-09-05 1981-04-11 Hitachi Ltd Ionization detector of electron capture
JPS5639467A (en) * 1979-09-06 1981-04-15 Ono Sokki Co Ltd Frequency-voltage converter
JPS5674265A (en) * 1979-10-30 1981-06-19 Xerox Corp Copier and operating same

Also Published As

Publication number Publication date
HK87488A (en) 1988-11-04
CA1208689A (en) 1986-07-29
JPH0580666B2 (ja) 1993-11-09
IN159571B (ja) 1987-05-30
DE3276199D1 (en) 1987-06-04
EP0108840A1 (en) 1984-05-23
JPS5974574A (ja) 1984-04-27
EG15983A (en) 1987-04-30

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