US4459013A — Duplex/simplex precollation copying system

Claim 1

Independent Claim 384 words

In an automatic document recirculating system for pre-collation copying of a set of documents wherein recirculation means are provided for multiply recirculating a set of individual documents in a recirculation path from document storage means to document imaging means for copying the individual documents and back to said same document storage means, the improvement comprising: first document inversion means in said document recirculation path for inverting documents being recirculated in said document recirculation path by said recirculation means; second document inversion means in said document recirculation path for further inverting documents being recirculated in said recirculation path; and duplex/simplex switching means in said document recirculation path for selecting between duplex and simplex copying of the documents being recirculated, said duplex/simplex switching means having first and second switching positions for selectively switching said second document inversion means in and out of said document recirculation path in coordination with the recirculation of a document set by said recirculation means, said duplex/simplex switching means in said first switching position returning the recirculated documents in each document recirculation to said same document storage means in inverted orientation after each document has been copied once on only one side, for copying opposite sides of the documents on alternate recirculations of the document set, and said duplex/simplex switching means in said second switching position returning the recirculated documents in each document recirculation to said document storage means in their original orientation for copying the same sides of the documents in the subsequent recirculations of the document set, wherein said duplex/simplex switching means includes first and second document transport means and movable document deflection means for deflecting documents between said first and second document transport means, and wherein said document deflection means is adjacent said first document inversion means, and wherein said first document transport means transports documents from said first document inversion means to said second document inversion means, and wherein said second document transport means transports documents from said first document inversion means to said document storage means, and wherein said second document inversion means comprises a rotatable non-vacuum roller, and wherein said first and second document transport means include respective first and second narrow belt flights, both partially centrally wrapped around said roller, for transporting a document between said first and second belt flights partially around said roller.

Claim 2

Dependent Claim 384 words

In an automatic document recirculating system for pre-collation copying of a set of documents wherein recirculation means are provided for multiply recirculating a set of individual documents in a recirculation path from document storage means to document imaging means for copying the individual documents and back to said same document storage means, the improvement comprising: first document inversion means in said document recirculation path for inverting documents being recirculated in said document recirculation path by said recirculation means; second document inversion means in said document recirculation path for further inverting documents being recirculated in said recirculation path; and duplex/simplex switching means in said document recirculation path for selecting between duplex and simplex copying of the documents being recirculated, said duplex/simplex switching means having first and second switching positions for selectively switching said second document inversion means in and out of said document recirculation path in coordination with the recirculation of a document set by said recirculation means, said duplex/simplex switching means in said first switching position returning the recirculated documents in each document recirculation to said same document storage means in inverted orientation after each document has been copied once on only one side, for copying opposite sides of the documents on alternate recirculations of the document set, and said duplex/simplex switching means in said second switching position returning the recirculated documents in each document recirculation to said document storage means in their original orientation for copying the same sides of the documents in the subsequent recirculations of the document set, wherein said duplex/simplex switching means includes first and second document transport means and movable document deflection means for deflecting documents between said first and second document transport means, and wherein said document deflection means is adjacent said first document inversion means, and wherein said first document transport means transports documents from said first document inversion means to said second document inversion means, and wherein said second document transport means transports documents from said first document inversion means to said document storage means, and wherein said second document inversion means comprises a rotatable non-vacuum roller, and wherein said first and second document transport means include respective first and second narrow belt flights, both partially centrally wrapped around said roller, for transporting a document between said first and second belt flights partially around said roller.

Claim 3

Dependent Claim 377 words

In an automatic pre-collation copying system for pre-collation recirculating copying of a set of duplex original documents, from a document storage means, at a document imaging means of a copier for copying the documents onto copy sheets to form pre-collated copy sets, wherein said copier has at least one copy sheet supply means and a separate copy sheet intermediate storage means and a copy sheet output means, and wherein said copier has an image transfer station for transferring images of the documents onto one side of copy sheets fed from either said copy sheet supply means or said copy sheet intermediate storage means, the improvement comprising: duplex document recirculation means for multiply circulating said set of duplex documents in a recirculation path from said document storage means to said document imaging means for copying all of one sides of said documents once in each circulation and for returning said documents back to said same document storage means in each circulation, said duplex document recirculation means including inversion means for inverting said circulating documents in each circulation before they are returned to said document storage means relative to their initial orientation so that on alternate circulations of said documents alternate sides of said documents are copied by said document imaging means, and duplex copy sheet handling means for feeding all of the copies, made on one of the alternate circulations of the duplex documents, from said copy sheet supply means through said transfer station and into said copy sheet intermediate storage means, and for feeding all of the copies, made on the other of the alternate circulations of the duplex documents, from said copy sheet intermediate storage means through the transfer station again, inverted, and to said copy sheet output means, so that pre-collated duplex copy sets are produced at said copy sheet output means on alternate circulations of said duplex documents by said duplex document recirculation means, wherein said duplex document set is stacked in said document storage means and wherein said duplex document recirculation means, during said document circulation, continuously removes the bottom-most sheet from said stack of documents in said document storage means and continuously restacks each document being circulated in order but inverted on the top of said stack after it has been copied.

Claim 4

Dependent Claim 377 words

In an automatic pre-collation copying system for pre-collation recirculating copying of a set of duplex original documents, from a document storage means, at a document imaging means of a copier for copying the documents onto copy sheets to form pre-collated copy sets, wherein said copier has at least one copy sheet supply means and a separate copy sheet intermediate storage means and a copy sheet output means, and wherein said copier has an image transfer station for transferring images of the documents onto one side of copy sheets fed from either said copy sheet supply means or said copy sheet intermediate storage means, the improvement comprising: duplex document recirculation means for multiply circulating said set of duplex documents in a recirculation path from said document storage means to said document imaging means for copying all of one sides of said documents once in each circulation and for returning said documents back to said same document storage means in each circulation, said duplex document recirculation means including inversion means for inverting said circulating documents in each circulation before they are returned to said document storage means relative to their initial orientation so that on alternate circulations of said documents alternate sides of said documents are copied by said document imaging means, and duplex copy sheet handling means for feeding all of the copies, made on one of the alternate circulations of the duplex documents, from said copy sheet supply means through said transfer station and into said copy sheet intermediate storage means, and for feeding all of the copies, made on the other of the alternate circulations of the duplex documents, from said copy sheet intermediate storage means through the transfer station again, inverted, and to said copy sheet output means, so that pre-collated duplex copy sets are produced at said copy sheet output means on alternate circulations of said duplex documents by said duplex document recirculation means, wherein said duplex document set is stacked in said document storage means and wherein said duplex document recirculation means, during said document circulation, continuously removes the bottom-most sheet from said stack of documents in said document storage means and continuously restacks each document being circulated in order but inverted on the top of said stack after it has been copied.

Claim 5

Dependent Claim 402 words

In an automatic pre-collation copier for pre-collation recirculating copying of a set of original document sheets stacked in a document storage means with document imaging means onto copy sheets to form pre-collated copy sets, wherein said copier has at least one copy sheet supply means and separate copy sheet intermediate storage means and copy sheet output means, and wherein said copier has a transfer station for transferring images of the documents from said imaging means onto one side of copy sheets fed from either said copy sheet supply means or said copy sheet intermediate storage means, the improvement, for so copying duplex documents, comprising: duplex document recirculation means for multiply circulating a set of duplex documents in a recirculation path from said document storage means to said document imaging means for copying all of one sides of said documents in said set once in each circulation and for returning said documents back to said same document storage means in each circulation; said duplex document recirculation means including selectable inversion means for selectably inverting or not inverting said circulating documents during a copying circulation as returned to said document storage means relative to their initial orientation in said document storage means; said duplex document recirculation means, during said copying circulation in which said documents are selectably inverted, continuously removes the bottom-most document from said same stack of duplex documents in said document storage means and continuously restacks each document being circulated in order but inverted on the top of said stack after it has been copied so that in the next subsequent recirculation of said documents after they have been so selectively returned inverted the sides of said documents which are copied at said document imaging means are opposite from the sides of the documents copied in said preceding said circulation, and duplex copy sheet handling means for feeding the copies made from one of the sides of the duplex documents from said copy sheet supply means through said transfer station and into said copy sheet intermediate storage means, and for feeding the copies made from the other of the sides of the duplex documents from said copy sheet intermediate storage means through the transfer station again, inverted, and to said copy sheet output means, so that multiple pre-collated duplex copy sets are produced at said copy sheet output means during multiple circulations of said duplex documents by said duplex document recirculation means.

Claim 6

Dependent Claim 402 words

In an automatic pre-collation copier for pre-collation recirculating copying of a set of original document sheets stacked in a document storage means with document imaging means onto copy sheets to form pre-collated copy sets, wherein said copier has at least one copy sheet supply means and separate copy sheet intermediate storage means and copy sheet output means, and wherein said copier has a transfer station for transferring images of the documents from said imaging means onto one side of copy sheets fed from either said copy sheet supply means or said copy sheet intermediate storage means, the improvement, for so copying duplex documents, comprising: duplex document recirculation means for multiply circulating a set of duplex documents in a recirculation path from said document storage means to said document imaging means for copying all of one sides of said documents in said set once in each circulation and for returning said documents back to said same document storage means in each circulation; said duplex document recirculation means including selectable inversion means for selectably inverting or not inverting said circulating documents during a copying circulation as returned to said document storage means relative to their initial orientation in said document storage means; said duplex document recirculation means, during said copying circulation in which said documents are selectably inverted, continuously removes the bottom-most document from said same stack of duplex documents in said document storage means and continuously restacks each document being circulated in order but inverted on the top of said stack after it has been copied so that in the next subsequent recirculation of said documents after they have been so selectively returned inverted the sides of said documents which are copied at said document imaging means are opposite from the sides of the documents copied in said preceding said circulation, and duplex copy sheet handling means for feeding the copies made from one of the sides of the duplex documents from said copy sheet supply means through said transfer station and into said copy sheet intermediate storage means, and for feeding the copies made from the other of the sides of the duplex documents from said copy sheet intermediate storage means through the transfer station again, inverted, and to said copy sheet output means, so that multiple pre-collated duplex copy sets are produced at said copy sheet output means during multiple circulations of said duplex documents by said duplex document recirculation means.

Claim 7

Dependent Claim 85 words

The automatic pre-collation copying system of claim 3, wherein said selectable inversion means comprises means for switching the number of inversions of said duplex documents in said recirculating copying path of said documents between said removal and return of said documents to said document storage means from a first path with two inversions to a second path with one inversion wherein said path with one inversion returns said documents inverted to said document storage means, and wherein said one inversion is common to both paths.

Claim 8

Dependent Claim 26 words

The automatic pre-collation copying system of claim 3, wherein said duplex document recirculation means removes said documents from only one end of said document storage means.

Claim 9

Dependent Claim 85 words

The automatic pre-collation copying system of claim 5 wherein said selectable inversion means comprises means for switching the number of inversions of said duplex documents in said recirculating copying path of said documents between said removal and return of said documents to said document storage means from a first path with two inversions to a second path with one inversion wherein said path with one inversion returns said documents inverted to said document storage means, and wherein said one inversion is common to both paths.

Claim 10

Dependent Claim 54 words

The automatic pre-collation copying system of claim 5, wherein said duplex document recirculation means returns said duplex documents to said same one end of said document storage means when they are returned inverted, but returns said duplex documents to an opposite end of said document storage means when said documents are returned not inverted.

Claim 11

Dependent Claim 85 words

The automatic pre-collation copying system of claim 7 wherein said selectable inversion means comprises means for switching the number of inversions of said duplex documents in said recirculating copying path of said documents between said removal and return of said documents to said document storage means from a first path with two inversions to a second path with one inversion wherein said path with one inversion returns said documents inverted to said document storage means, and wherein said one inversion is common to both paths.

Claim 12

Dependent Claim 48 words

The automatic pre-collation copying system of claim 7 wherein said same duplex document recirculation means is additionally operable for the copying of simplex documents by selectably operating said inversion means to return said simplex documents to said document storage means in their initial orientation for all circulations thereof.

Claim 13

Dependent Claim 48 words

The automatic pre-collation copying system of claim 5 wherein said same duplex document recirculation means is additionally operable for the copying of simplex documents by selectably operating said inversion means to return said simplex documents to said document storage means in their initial orientation for all circulations thereof.

Claim 14

Dependent Claim 48 words

The automatic pre-collation copying system of claim 3, wherein said same duplex document recirculation means is additionally operable for the copying of simplex documents by selectably operating said inversion means to return said simplex documents to said document storage means in their initial orientation for all circulations thereof.

Claim 15

Dependent Claim 332 words

In automatic document recirculating means for pre-collation copying of a set of individual document sheets by multiply recirculating said set of documents in a copying circulation path extending from the bottom of a stack of documents in a document storage means to a document imaging means of a copier, and then returning to the top of said same stack in said storage means, for copying each document once in each said circulation, the improvement for precollation copying of duplex documents, comprising: first document inversion means in said document copying circulation path for inverting once the documents being circulated for copying by said recirculation means: second document inversion means in said document copying circulation path in series with said first document inversion means for inverting a second time the documents being circulated for copying by said recirculation means; and duplex/simplex switching means in said document copying circulation path having first and second switching positions for respectively selectively switching one of said first or second document inversion means effectively in or out of said document copying circulation path, said document recirculating means, with said duplex/simplex switching means in said first switching position, returning the documents in said document copying circulation path back to said same document stack in inverted orientation relative to their initial orientation therein after each document has been copied and inverted only once in said circulation by passing completely through only one of said first or second document inversion means, for copying the opposite sides of the documents in the next subsequent circulation of the document set, and said document recirculating means, with said duplex/simplex switching means in said second switching position, returning the documents in said document copying circulation path back to said same document stack in their original orientation after each document has been copied and inverted twice in said circulation, by passing through both said first and second document inversion means, for copying the same sides of the documents in the next subsequent circulation of the document set.

Claim 16

Dependent Claim 332 words

In automatic document recirculating means for pre-collation copying of a set of individual document sheets by multiply recirculating said set of documents in a copying circulation path extending from the bottom of a stack of documents in a document storage means to a document imaging means of a copier, and then returning to the top of said same stack in said storage means, for copying each document once in each said circulation, the improvement for precollation copying of duplex documents, comprising: first document inversion means in said document copying circulation path for inverting once the documents being circulated for copying by said recirculation means: second document inversion means in said document copying circulation path in series with said first document inversion means for inverting a second time the documents being circulated for copying by said recirculation means; and duplex/simplex switching means in said document copying circulation path having first and second switching positions for respectively selectively switching one of said first or second document inversion means effectively in or out of said document copying circulation path, said document recirculating means, with said duplex/simplex switching means in said first switching position, returning the documents in said document copying circulation path back to said same document stack in inverted orientation relative to their initial orientation therein after each document has been copied and inverted only once in said circulation by passing completely through only one of said first or second document inversion means, for copying the opposite sides of the documents in the next subsequent circulation of the document set, and said document recirculating means, with said duplex/simplex switching means in said second switching position, returning the documents in said document copying circulation path back to said same document stack in their original orientation after each document has been copied and inverted twice in said circulation, by passing through both said first and second document inversion means, for copying the same sides of the documents in the next subsequent circulation of the document set.

Claim 17

Dependent Claim 48 words

The automatic document recirculation means of claim 12, wherein said duplex/simplex switching means returns said documents in said circulation path to one end of said document storage means in said first switching position and to the opposite end of said document storage means in said second switching position.

Claim 18

Dependent Claim 27 words

The automatic document recirculating means of claim 12, wherein only a single sheet feeder at only one end of said document storage means feeds said documents therefrom.

Claim 19

Dependent Claim 48 words

The automatic document recirculating means of claim 14 wherein said duplex/simplex switching means returns said documents in said circulation path to one end of said document storage means in said first switching position and to the opposite end of said document storage means in said second switching position.

Claim 20

Dependent Claim 73 words

The automatic document recirculating means of claim 12, wherein said first and second document inversion means are located adjacent opposite ends of said document storage means, and comprise large diameter rollers and means for transporting said documents partially around said rollers, and wherein said duplex/simplex switching means comprises sheet deflector means adjacent one of said rollers to deflect documents from said one roller into one of two different paths in said copying circulation.

Claim 21

Dependent Claim 48 words

The automatic document recirculating means of claim 16 wherein said duplex/simplex switching means returns said documents in said circulation path to one end of said document storage means in said first switching position and to the opposite end of said document storage means in said second switching position.

Claim 22

Dependent Claim 230 words

In a method of pre-collation copying of a set of individual document sheets by multiply circulation said set of documents in a copying circulation path extending from the bottom of a stack of said documents in a document storage means to a document imaging means of a copier and then returning to the top of the same stack in said same storage means, for copying each document once in each said circulation; the improvement for the selective pre-collation copying of duplex or simplex documents comprising: when said documents in said stack are simplex documents, inverting the documents being circulated for copying twice in each copying circulation to return them back to the top of said same document stack in their original orientation therein after each document has been copied and inverted twice in said copying circulation, and, thereby, copying the same sides of the documents in the next subsequent circulation of the document set, and, when said documents in said stack are duplex documents, inverting only once the documents being circulated for copying in a copying circulation to return them back to the top of said same document stack in inverted orientation relative to their initial orientation therein after each document has been copied and inverted once in said copying circulation path, and, thereby, copying the opposite sides of the documents in the next subsequent circulation of the document set.

Claim 23

Dependent Claim 230 words

In a method of pre-collation copying of a set of individual document sheets by multiply circulation said set of documents in a copying circulation path extending from the bottom of a stack of said documents in a document storage means to a document imaging means of a copier and then returning to the top of the same stack in said same storage means, for copying each document once in each said circulation; the improvement for the selective pre-collation copying of duplex or simplex documents comprising: when said documents in said stack are simplex documents, inverting the documents being circulated for copying twice in each copying circulation to return them back to the top of said same document stack in their original orientation therein after each document has been copied and inverted twice in said copying circulation, and, thereby, copying the same sides of the documents in the next subsequent circulation of the document set, and, when said documents in said stack are duplex documents, inverting only once the documents being circulated for copying in a copying circulation to return them back to the top of said same document stack in inverted orientation relative to their initial orientation therein after each document has been copied and inverted once in said copying circulation path, and, thereby, copying the opposite sides of the documents in the next subsequent circulation of the document set.

Claim 24

Dependent Claim 58 words

The method of pre-collation copying of claim 18, wherein said circulation path with said inverting twice step is provided by rotating the documents through two large diameter roller inverters in series but spaced at opposite ends of said document storage means, and wherein said inverting only once step is provided by effectively bypassing one of said roller inverters.

Claim 25

Dependent Claim 34 words

The method of pre-collation copying of claim 18, wherein all said circulations of said document set other than, at most, the first and last circulations, are copying circulations, for either duplex or simplex documents.

Claim 26

Dependent Claim 31 words

The method of pre-collation copying of claim 18, wherein said document circulation path is common for both said duplex and simplex document sets for one said inversion in said copying circulation.

Claim 27

Dependent Claim 49 words

The method of pre-collation copying of claim 18, wherein said duplex documents are stacked in said stack in their normal forward serial page order, and are first copied on their even numbered sides in the first said copying circulation, and are copied in forward serial order in all circulations.

Claim 28

Dependent Claim 114 words

The method of pre-collation copying of claim 18 further including the steps of: sequentially copying all of the first sides of all of the duplex documents in a duplex document set being circulated for copying onto the first sides of corresponding copy sheets fed from a copy sheet supply to produce simplexed copy sheets of said first sides of said documents, temporarily storing said simplexed copy sheets in a buffer storage area, then sequentially copying the second sides of the duplex document set in a subsequent copying circulation onto the second sides of said simplexed copy sheets fed from the buffer storage area to form completed precollated duplex copy sets from said duplex documents.

Claim 29

Dependent Claim 31 words

The method of pre-collation copying of claim 23 wherein said document circulation path is common for both said duplex and simplex document sets for one said inversion in said copying circulation.

Claim 30

Dependent Claim 34 words

The method of pre-collation copying of claim 23 wherein all said circulations of said document set other than, at most, the first and last circulations, are copying circulations, for either duplex or simplex documents.

Claim 31

Dependent Claim 40 words

The method of pre-collation copying of claim 23, wherein said simplexed copy sheets are stacked into said buffer storage area, from the top of the stack, and removed from said buffer storage area from the bottom of the same stack.

Claim 32

Dependent Claim 76 words

The method of pre-collation copying of claim 23, wherein said documents are circulated and copied in the same serial order direction for each said cirulation thereof, wherein all said circulations of said document set other than, at most, the first and last circulations, are copying circulations, for either duplex or simplex documents, and wherein said document circulation path is common for both said duplex andd simplex document sets for one said inversion in said copying circulation.

Claim 33

Dependent Claim 58 words

The method of pre-collation copying of claim 23 wherein said circulation path with said inverting twice step is provided by rotating the documents through two large diameter roller inverters in series but spaced at opposite ends of said document storage means, and wherein said inverting only once step is provided by effectively bypassing one of said roller inverters.

Claim 34

Dependent Claim 49 words

The method of pre-collation copying of claim 23 wherein said duplex documents are stacked in said stack in their normal forward serial page order, and are first copied on their even numbered sides in the first said copying circulation, and are copied in forward serial order in all circulations.

Claim 35

Dependent Claim 26 words

The method of pre-collation copying of claim 18, wherein said documents are circulated and copied in the same serial order direction for all said circulations thereof.

Claim 36

Dependent Claim 58 words

The method of pre-collation copying of claim 30 wherein said circulation path with said inverting twice step is provided by rotating the documents through two large diameter roller inverters in series but spaced at opposite ends of said document storage means, and wherein said inverting only once step is provided by effectively bypassing one of said roller inverters.

Claim 37

Dependent Claim 34 words

The method of pre-collation copying of claim 30 wherein all said circulations of said document set other than, at most, the first and last circulations, are copying circulations, for either duplex or simplex documents.

Claim 38

Dependent Claim 31 words

The method of pre-collation copying of claim 30 wherein said document circulation path is common for both said duplex and simplex document sets for one said inversion in said copying circulation.

Claim 39

Dependent Claim 258 words

Duplicating apparatus for producing copies from a set of original sheets, the original sheets defining first and second faces, the copies including ccorresponding sets of individual supports having first and second faces, said apparatus comprising: a feeder for the original sheets, said feeder including a feeder hooper for receiving the set of original sheets, means defining an exposure position spaced from said hopper at which the original sheets are located for copying, and means for circulating the set of original sheets a plurality of times from said hopper to said exposure position and back to said hopper, said circulating means including means for presenting the second faces of the original sheets for copying on the first and every odd copying circulation and for presenting the first faces of the original sheets for copying on the second and every even copying circulation; a process section for establishing visible representations of the original faces presented in said exposure position; and a copy duplexing section having means for presenting and re-presenting the copy supports to said process section to receive the visible representations on the second and first faces of the copy supports, said presenting and re-presenting means including a support hopper for receiving a respective set of the copy supports between the presentation and re-presentation of the supports to said process section, means for delivering the supports to said support hopper with each support on top of previously delivered supports, and means for removing the supports from said support hopper with the first delivered support removed before later delivered supports.

Claim 40

Dependent Claim 258 words

Duplicating apparatus for producing copies from a set of original sheets, the original sheets defining first and second faces, the copies including ccorresponding sets of individual supports having first and second faces, said apparatus comprising: a feeder for the original sheets, said feeder including a feeder hooper for receiving the set of original sheets, means defining an exposure position spaced from said hopper at which the original sheets are located for copying, and means for circulating the set of original sheets a plurality of times from said hopper to said exposure position and back to said hopper, said circulating means including means for presenting the second faces of the original sheets for copying on the first and every odd copying circulation and for presenting the first faces of the original sheets for copying on the second and every even copying circulation; a process section for establishing visible representations of the original faces presented in said exposure position; and a copy duplexing section having means for presenting and re-presenting the copy supports to said process section to receive the visible representations on the second and first faces of the copy supports, said presenting and re-presenting means including a support hopper for receiving a respective set of the copy supports between the presentation and re-presentation of the supports to said process section, means for delivering the supports to said support hopper with each support on top of previously delivered supports, and means for removing the supports from said support hopper with the first delivered support removed before later delivered supports.

Claim 41

Dependent Claim 60 words

Duplicating apparatus as set forth in claim 34 wherein said removing means of said copy duplexing section comprises a support feeder positioned under the support hopper for withdrawing supports one-after-another from the bottom of a set of supports in the support hopper and for directing such removed supports seriatim to the process section to receive respective second visible representations thereon.

Claim 42

Dependent Claim 66 words

Duplicating apparatus as set forth in claim 35 further comprising a copy receiving hopper, means defining a first support path leading from said process section to said support hopper and a second support path leading from said process section to said copy receiving hopper, and means for selectively directing said copy supports along one of said paths leading to said support hopper or said receiving hopper.

Claim 43

Dependent Claim 271 words

A document feeder for presenting seriatim to a copying apparatus a set of a plurality of document sheets, each document sheet having opposed first and second faces, said feeder comprising: a support having a single sheet supporting floor for receiving the set of document sheets in a stack thereon; means defining an exposure position which is spaced from said floor and at which the document sheets are presented for copying; and means for circulating the set a plurality of times, one sheet after another, through a circulation path from said support to said exposure position for copying one face and back to said support, said circulating means defining a first sheet path extending from said floor to said exposure position and a second sheet path extending from said exposure position back to said support and said circulating means including means for removing sheets seriatim from the bottom of the stack on said support and for circulating each of the sheets succesively along said first sheet path and through said exposure position and then through said second sheet path and for returning the sheets to the top of the stack after presenting only one face of each sheet at said exposure position for copying only once per circulation, and with a total odd number of document sheet inversions for the entire circulation path; so that only first faces of the sheets are presented for copying on odd numbered set circulations and only second faces are presented for copying on even numbered set circulations, and said sheets are returned to said stack during each circulation inverted from their preceding orientation in said stack.

Claim 44

Dependent Claim 271 words

A document feeder for presenting seriatim to a copying apparatus a set of a plurality of document sheets, each document sheet having opposed first and second faces, said feeder comprising: a support having a single sheet supporting floor for receiving the set of document sheets in a stack thereon; means defining an exposure position which is spaced from said floor and at which the document sheets are presented for copying; and means for circulating the set a plurality of times, one sheet after another, through a circulation path from said support to said exposure position for copying one face and back to said support, said circulating means defining a first sheet path extending from said floor to said exposure position and a second sheet path extending from said exposure position back to said support and said circulating means including means for removing sheets seriatim from the bottom of the stack on said support and for circulating each of the sheets succesively along said first sheet path and through said exposure position and then through said second sheet path and for returning the sheets to the top of the stack after presenting only one face of each sheet at said exposure position for copying only once per circulation, and with a total odd number of document sheet inversions for the entire circulation path; so that only first faces of the sheets are presented for copying on odd numbered set circulations and only second faces are presented for copying on even numbered set circulations, and said sheets are returned to said stack during each circulation inverted from their preceding orientation in said stack.

Claim 45

Dependent Claim 26 words

The document feeder of claim 37, wherein said circulating means circulates the document sheets in a continuous unidirectional circulation path without reversal through said exposure position.

Claim 46

Dependent Claim 64 words

The document feeder of claim 37, wherein said circulation means additionally selectably provides an alternative circulation path for simplex document sheet handling, differing from the first-mentioned circulation path by only one document sheet inversion, and with an even total number of document inversions, so that selectably the same faces of the document sheets may be copied on both odd and even numbered set circulations.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-07-10	1988-01-09	1988-07-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-07-10	1992-01-09	1992-07-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-07-10	1996-01-09	1996-07-10	$7700.00	Window Closed / Lapsed

Duplex/simplex precollation copying system

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