US3583807A - Method and apparatus for making composite electrophotographic prints - Google Patents

Method and apparatus for making composite electrophotographic prints Download PDF

Info

Publication number
US3583807A
US3583807A US741359A US3583807DA US3583807A US 3583807 A US3583807 A US 3583807A US 741359 A US741359 A US 741359A US 3583807D A US3583807D A US 3583807DA US 3583807 A US3583807 A US 3583807A
Authority
US
United States
Prior art keywords
stations
station
chips
transfer
exposure
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 - Lifetime
Application number
US741359A
Other languages
English (en)
Inventor
John S Pollock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of US3583807A publication Critical patent/US3583807A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/26—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is obtained by projection of the entire image, i.e. whole-frame projection
    • G03G15/266—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is obtained by projection of the entire image, i.e. whole-frame projection using a reusable recording medium in form of a plate or a sheet
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
    • G03G15/0194—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to the final recording medium
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00443—Copy medium
    • G03G2215/00451—Paper
    • G03G2215/00455—Continuous web, i.e. roll
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00789—Adding properties or qualities to the copy medium
    • G03G2215/00814—Cutter

Definitions

  • three sets of chips are moved through separate [54] METHOD AND APPARATUS FOR MAKING charging stations and sequentially cycled through a single ex- COMPOSITE ELECTROPHOTOGRAPHIC RI posure station. After exposure the electrostatic image on each 22 Chill", 17 Driving 8 chip is developed by different color toners at separate [52] [1.8. CI 355/4 development stations and "ansfer of the toner images is made [5 I ⁇ [at CL" 603 15/22 sequentially to a receiver at a single transfer station to make a 501 Field of Search 355/3, 4, 18, 38; 8/637; 1 17/175 exposure stations are used to expose the respective chips to color separation images to form three separate electrostatic [56] References Cited images, one on each chip.
  • Th'ese electrostatic images are UNITED STATES PATENTS developed and transferred at separate transfer stations onto a single receiver which is moved sequentially past each transfer 5 55: station to form a composite color print.
  • each chip in a further embodi- 41 4353 [2,1968 'i" 355/180) ment each chip is exposed sequentially at a single exposure 344787l 6/1969 Neale 355/88(x) station to form electrostatic images which are developed and 278O972 2/1957 i' 95/14) then are transferred at separate transfer stations to a receiver which is moved sequentially past each transfer station to form Primary Examiner-John M. Horan a composite color print. in each embodiment, the chips are cy- Attomeys-Robert W. Hampton and Gary D. Fields v cled so that color prints are made substantially continuously.
  • FIG-5a AM 0 BY Ass WM sIGNAL FROM SWITCH I62 ATTORNE Y8 PATENIEDJuu 8
  • This invention relates to an apparatus for making electrophotographic prints and more particularly to an apparatus for placing several electrophotographically formed toner images in registry on a receiver, such as to form a color print, each image representing a color separation image from the original being copied.
  • apparatus which utilizes separate photoconductive elements that may be cycled or programmed to move through the various stations of the apparatus to provide composite prints comprising a plurality of superimposed images on a substantially continuous basis which are in substantially perfect register and of high quality.
  • These elements may be in the form of flat rectangular chips.
  • several sets of photoconductive chips are provided which are sequentially moved from a storage position through a charging station, an exposure station, a developing station, a transfer station, a cleaning station, and then back to the storage position. Each of these sets utilizes the same exposure station and transfer station and each chip is aligned by the same aligning means thereby simplifying the registration problems both for exposure and transfer.
  • Original images to be copied are projected onto separate photoconductive chips to form latent electrostatic images which may be toned and then transferred in registry to form the composite print.
  • These original images may be any radiation patterns such as color separation images formed from a color transparency.
  • the entire transparency can be exposed at one time so that a photocell (not shown) may sense the total light coming therethrough to adjust the exposure over a wide range of time in response to the image brightness, the sensitivity of the photoconductor to the particular color of light, and to provide the proper color balance.
  • the chips are cycled so that chips which are not at an active station, Le.
  • one at which work is being done on the chip may be held momentarily in either a passive "hold” or escape” station until they can be cycled to the next station. This holding procedure can occur both before and after the exposure and transfer stations. However, since the chips are not interconnected in any way, they can be moved at different relative speeds dependent upon the position of other chips in the apparatus.
  • a separate exposure and transfer station is provided for each set of chips.
  • separate photoconductors maybe exposed simultaneously to different radiation patterns or original images.
  • the receiver is moved past each transfer station sequentially to pick up each toned image in registry with the last toned image so as to provide a composite print.
  • the chip system provides the flexibility of movement needed to assure that all developed chips are at their respective transfer stations at the appropriate time even though the exposure of these chips may occur over different time increments or periods.
  • exposure of the different chips may be done sequentially whereas the transfer may be made substantially simultaneously, i.e., in rapid sequence across multiple transfer station.
  • FIG. 1 is a schematic view showing the electrophotographic apparatus of this invention in a color print system
  • FIGS. 2, 2a and 2b are perspective views of photoconductive chips which may be utilized in this invention.
  • FIG. 3 is a schematic perspective view of one embodiment of this invention wherein sets of photoconductive chips are cycled sequentially through a single exposure station and a single transfer station;
  • FIGS. 4, 4a, 4b and 4c are logic diagrams for the charging and sequential exposure stations of FIG. 3;
  • FIGS. 5 and 5a are logic diagrams for the transfer station of FIG. 3;
  • FIG. 6 is a schematic perspective view of another embodiment wherein sets of photoconductive chips are cycled through separate exposure and transfer stations;
  • FIG. 6a is a fragmentary section, on an enlarged scale, showing a means for moving a chip from an exposure station to a developing station;
  • FIG. 7 is a logic diagram for the simultaneous exposure stations of FIG. 6;
  • FIGS. 8 and 8a are logic diagrams for the transfer stations of FIG. 6.
  • FIG. 9 is a schematic perspective view of a further embodiment wherein sets of photoconductive chips are cycled sequentially through a single exposure station and are cycled through separate transfer stations.
  • FIG. I an electrophotographic apparatus A is illustrated in FIG. I which includes a charging station, an exposure station, a developing station, a transfer station, and a cleaning station.
  • This apparatus has particular application as a color processor for making color reflective prints from color negatives.
  • the invention would have application in any embodiment wherein it was desired to superimpose in aligned relationship two or more images, whether of the same color or different colors.
  • an image, such as from a color negative can be projected by means ofa light source 11 through heat absorber and color balancing filters 12, as shown.
  • the image from negative 10 is projected by a lens 13 past a shutter 14 and through color filters 15 onto a photoconductive chip at the exposure station.
  • the electrostatic image on the chip is developed with a toner having a color complementary to the originally projected image at the developing station.
  • the resulting tone image is transferred to a receiver 16 fed from a roll 17. After transfer, the receiver may pass through a lacquering station 18 and a drying station 19 to a cutting mechanism 20 to provide finished prints 21.
  • a photoconductive chip may have a relatively rigid base, such as base 24 of chip C in FIG. 2. To one side of base 24 is attached a layer of photoconductive material 25.
  • Base 24 can be made of glass or metal or some other rigid material or could be made of a plastic material and could be bendable but should be rigid enough to be easily handled.
  • Base 24 has three bosses 26, 27, and 28 which are adapted to engage alignment pins at the exposure and transfer stations to assure that the chip is in proper position.
  • a chip C is shown having a base 29 to which a photoconductor 30 is attached. Base 29 has a hole 31 adjacent one edge thereof and a slot 32 adjacent the same edge but spaced from hole 31 so that chip C may be dropped down over a pair of pins at the exposure and transfer stations.
  • a photoconductive chip C" which has a base 33 having a photoconductor 34 attached to one side of two rows of sprocket holes 35 adjacent opposite edges thereof to provide registry means at exposure and transfer stations, respectively, and for engagement with suitable teeth on drive means for advancing the chips from one station to another.
  • electrophotographic apparatus A is provided with three stacks or sets of photoconductive chips supplied from storage stations 40, 40' and 40,
  • the chips are fed sequentially from the bottom of their respective storage positions by intermittently driven belts 41, 41' and 41" which have spaced dogs, such as dogs 42, 42' and 42".
  • the chips are then engaged by similar dogs on continuously running belts 43, 43 and 43" which drive the chips past charging stations 44, 44' and 44", respectively wherein an electrostatic charge is placed on the photoconductive surface of each chip.
  • Drive belts 43, 43 and 43" move the respective chips into holding stations or hold-to-expose stations 45, 45' and 45" where they are held until each chip can be sequentially moved to a stationary exposure station by an elevator to be described.
  • the chips are sequentially moved from the hold-to-expose stations by intermittently driven belts 46, 46 and 46", each having dogs which engage the chips. Upon reaching the top of the elevator, each chip is moved down to the exposure station, as by endless belt 47 to exposure station 48.
  • each chip is at the exposure station will depend on the color of the light image to which it is exposed and also the density of that image. Thus, cycling time for each chip will be different at the exposure station. This difference in time is compensated for at hold-to-expose stations 45, 45' and 45" and at escape-to-develop stations 49, 49' and 49" to which the respective chips are driven by intermittently driven endless belts 50, 50' and 50".
  • Each of these belts has spaced dogs, such as dogs 51, 51 and 51" which are adapted to engage openings in the respective chips so that they are moved to the appropriate development station.
  • the chips from storage station 40 have an opening 52 located in one corner adjacent the marginal edge thereof which is adapted to be engaged by dog 51 of drive belt 50 so that when a chip from this set is in the exposure station it will be driven from the exposure station to escape-to-develop station 49, as shown.
  • the set of chips from storage station 40 are provided with an opening 53 in a center portion of the marginal edge, as shown, for engagement by dogs 51 of intermittent drive 50' so that when one of these chips is in the exposure station it will be driven to escape-for-transfcr station 49.
  • the chips from storage station 40" have an opening 54 in a comer adjacent the marginal edge thereof which is engageable by dogs 51" of intermittent drive 50" to move those chips from the exposure station to escape-for-develop station 49.
  • the chips then are driven by motors 55, 55 and 55', respectively, from their respective escape-to-develop stations by continuously driven belts 56, $6 and 56", having spaced dogs thereon which engage the chips, across development stations 57, 57 and 57", respectively, where the latent electrostatic image thereon is toned.
  • the same continuously driven belts move the chips into hold-for-transfer stations 58, 58 and 58".
  • the chips await their turn in the cycling sequence in which each chip is moved to transfer station 59 by means of a transfer roller 61 moved across the receiver by endless belt 62.
  • the chips are moved by intermittently driven belt 63 into an intermittently running elevator 64 having means 65 for engaging the chips and raising them as shown.
  • the chips are moved by continuously running belts 66, 67, or 68 each of which has spaced dogs 69, 71, and 72, respectively, for engaging holes 52, 53 and 54 of the respective chips to move them in the appropriate direction.
  • the chips which are engaged by dogs 69 are moved to a hold-for-clean station 73 where they are engaged by dogs on a continuously running belt 74 which moves them past a cleaning station 75 and back to the top of storage station 40. If a chip is engaged by dogs 71, it is moved directly to cleaning station 75 and back to the top of storage station 40.
  • the chips which are engaged by dog 72 are moved to a hold-toclean station 77 where they are engaged by dogs on a continuously running belt 79 which moves the chips past a cleaning station 75" and back to the top of storage station 40".
  • each of the holding and escape stations has been shown in FIG. 3 to be stationary to simplify the illustration thereof but it will be understood that these passive stations may be part of the conveying system which transports the chips from one active station to another.
  • the passive" stations are those at which no work is done on the chips and the active" stations are those at which work is done on the chips.
  • the important thing is that the length of time that a given photoconductive chip spends at any one of the escape or hold stations may be varied. Also, it should be evident that the chips move continuously through all the processing stations with the exception of the exposure station and the transfer station in which they are held stationary during the exposure and print cycles, respectively.
  • the cycling can be adjusted so that as soon as one chip leaves the transfer station another chip is ready to take its place, providing a substantially continuous transfer operation. Thus, printing of successive images can take place at a very rapid rate.
  • the times necessary for charging, exposing, developing, transferring and cleaning for all colors must be compatible to the extent that at least one chip will be in each hold station at any time when exposure times vary randomly about normal. If a lot of short exposure times occur in succession, the number of chips will build up on the hold-to-transfer stations until they reach some predetermined arbitrary number, at which time an interlock (not shown) will prevent more exposures from being made until the number of chips in this hold station drops below the predetermined number. When a hold-for-transfer station runs out of chips, because of a succession of long exposures, no transfers will be made, but the rest of the operations will continue. When, a chip is again in this hold station, the transfer operation will continue again.
  • a switch (not shown) may be closed by the operator which sends a signal to single shot generator 81 of FIG. 4 which in turn causes OR gate 82 to provide a signal to single shot generator 83, such as 1.0 second duration, which causes charge insertion motor 84 to drive belt 41 to move the bottommost chip out of storage station 40 into a position where it can be engaged by dogs on belt 43 which is continuously driven by 'motor 85.
  • a microswitch 86 shown in FIG.
  • a chip in hold-for-expose station 45" will close a microswitch 100 which will generate a signal to AND gate 101.
  • AND gate 101 will activate single shot generator 102 for approximately 0.3 seconds to energize motor 103 connected to drive belt 46 of FIG. 3 to drive chip to the elevator.-Thus, the chips will be alternatingly received from each set so that subsequent color separation exposures may be made on one chip from each set.
  • a chip inserted in the top of elevator 47 will close a microswitch 104, generating a signal to AND gate 105, of FIG. 4. If no chip is in the exposure position, the AND gate will generate a signal to single shot generator 106 of a duration of say 0.3 seconds which will energize elevator motor 107 to move the chip from the top of the elevator to the exposure station 48 at the bottom. It will be understood that elevator 47 may contain a plurality of chips so. that the chip which is inserted in the top of the elevator will not necessarily be the next chip to be inserted in the exposure station. If the chip received in the top of the elevator is the first one, the above-described operations will continue until the elevator is filled and a chip is in place in exposure station 48.
  • the output signals from clamps 111 and 112 activate AND gate 113 which provides a signal to exposure monitoring station 114, and to AND gate 115. At this point a positive signal will be supplied to AND gate 115 from the zero output terminal of a flip-flop circuit 116. Thus, gate 115 will transmit a signal to OR gate 117 which will energize solenoid 118 to open a shutter (not shown) permitting exposure of the photoconductor to an image transmitted by lens 13 of FIG. 1 from negative 10. Also, solenoid 119 will be energized to interpose a filter, such as a red filter, (not shown) between negative-10 and photoconductive chip C in exposure station 48.
  • a filter such as a red filter
  • the signal from AND gate 115 will also provide a signal to AND gate 120 which will also receive a negative pulse of 1.1 seconds from single shot generator 121 which in turn receives an input signal from normally open microswitch 122 of FIG. 3 indicating that no chip is present in hold-for-development station 49. This will activate OR gate 82 through normally closed switch 123, single shot generator 83 and chip insertion motor 84 to start another chip through the charging station to assure a continuous operation.
  • the length of time that the shutter is opened is determined by the color of light being projected and the density of the negative. This may be controlled in a manner disclosed in commonly assigned U.S. Pat. No. 3,321,307, entitled Exposure Control in Xerographic Printing" to Urbach or by other suitable means all of which form part of exposure monitoring station 114.
  • a signal will be generated by the exposure monitoring station 114 to AND gate 115 which becomes blocking so that solenoid 118 closes the shutter and solenoid 119 removes the filter.
  • OR gate 124 When AND gate 115 discontinues transmitting a signal, OR gate 124 will generate a signal to single shot generator 125 which generates a signal of say 0.4 seconds thereby activating AND gate 126 and exposure exit motor 127 which is connected to belt 50' in turn connected to belts 50 and 50" by the bevel gear arrangement shown so that all three belts are driven simultaneously. Since a chip from storage station 40 is in the exposure chamber, it will have an opening 52 in one corner thereof which will be engaged by an articulated dog 51 on endless belt 50 so that the chip will be moved from the exposure station to hold-for-development station 49.
  • AND gate 128 is activated to energize a second solenoid 130 to place a filter, such as a green filter (not shown) in front of negative 10 and provide a signal to OR gate 117 which again activates shutter solenoid 118 to open the shutter for exposure.
  • a filter such as a green filter (not shown)
  • exposure monitoring station 114 will provide a signal to AND gate 128 which will cause it to terminate its output signal thereby causing solenoid 118 to close the shutter and removing the filter from in front of negative 10.
  • the termination of this exposure will activate OR gate 124 which, as described above, will cause exit drive motor 127 to be energized. Since a chip from storage station 40' of FIG. 3 is in exposure station 48, which has an opening 53 in the center of the marginal edge thereof, this opening will be engaged by dog 51' on belt 50' thereby moving the chip from exposure station 48 to hold-to-develop station 49' closing microswitch 131. The closing of this switch will provide a signal to the trigger of flip-flop circuit 129, FIG.
  • AND gate 132 which will also receive a signal from AND gate 113 after a chip from the third storage chamber 40" has been properly registered in exposure station 48, as described with respect to the previous chips.
  • the output signal from AND gate 132 will activate solenoid 133 which will place a color filter between the chip and negative 10, such as a blue filter, and the same signal will activate OR gate 117 to open the shutter operated by solenoid 118 to make the exposure.
  • normally closed switch 123 between AND gate 120 and OR gate 82 may be opened and the operator may close the negative ready-to-print switch so that an input is provided to negative gate clamp 112 even when no negative is in place so that the chips which are in intermediate positions throughout the machine may be run through exposure station 48 and subsequentially returned to their storage stations.
  • a chip in hold-to-develop station 49 will be moved through development station 57 by dogs on endless belt 56 to a holdfor-transfer station 58, as shown in FIG. 3, closing microswitch 135 toprovide a signal to AND gate 136 of FIG. 5.
  • transfer station 59 does not have a chip therein, an output signal from AND gate 136 will cause single shot generator 137 to generate a signal 03 seconds, to motor 138 which drives belt 60 to move a chip from hold station 58 to transfer station 59.
  • the chip When the chip reaches transfer station ,59, it will close a microswitch 139 which will terminate the signal from AND gate 136 and stop motor 138. This same signal will also trigger AND gate 141, of FIG.
  • transfer roller 61 When transfer roller 61 reaches the end of its path, it will close microswitch 148 providing a signal to AND gate 149, FIG. 5, which together with the signal from switch 139 will cause the AND gate to generate a signal to single shot generator 151.
  • Single shot generator 151 will generate a signal, such asO.5 seconds, to AND gate 152 which will cause transfer station exit drive motor 153 to be energized so that belt 63 is driven. Dogs thereon engage the chip and move it to elevator 64 where it will be raised, as described below. Looking at the left-hand side of FIG.
  • single shot generator 137 puts out an output signal to motor 138 to drive the ship from hold station 58 to transfer station 59
  • a signal is also generated to several other single shot generators including single shot generator 154 which generates the signal from its .zero output for a period of say 1.6 seconds so that when the signal goes positive again it provides a signal to AND gate 155.
  • This delay of L6 seconds is sufficient for the image on the first chip to be transferred and for the chip to be moved out of the transfer station to the elevator.
  • the AND gate 155 receives a signal from single shot generator 154 and a signal from microswitch 156 in hold station 58 indicating that a chip with a developed image thereon is ready for transfer and when microswitch 139 in transfer station 59 is open indicating that no chip is present in the transfer station, a signal will be generated by AND gate 155 to single shot generator 157 which will generate a signal of 0.3 seconds to energize chip insertion motor 158. Motor 158 then drives endless belt 60 so that the dogs thereon move the chip from hold station 58 into transfer station 59. When switch139 is again closed by the chip moving into position, the chip will be registered and transfer made as described above. At the end of transfer, a signal from switch 148 will cause motor 153, as described above, to drive a chip from the transfer station 59 into elevator 64.
  • the signal from single shot generator 137 will also provide a signal to single shot generator 159 which will generate a signal from its zero output of a duration of say 3.2 seconds which gives time for the transfer from both of the first two chips to be made and for the chips to be driven to the elevator.
  • AND gate 161 will generate a signal if a signal has been received from microswitch 162 in hold station 58" of FIG. 3, indicating that a developed chip is ready for transfer, and if no signal is received from switch 139 indicating the transfer station 59 is empty.
  • This generated signal will cause signal shot generator 163 to provide a signal of 0.3 seconds to motor 164 to cause endless belt 61 of FIG. 3, to drive a chip from hold station 58" into transfer station 59.
  • a signal from the closing of microswitch 139 will cause the chip to be registered and transfer made as described above.
  • the signal from single shot generator 137 also provides a signal to another single shot generator 165 which generates a signal from its zero" output of a duration of say 4.8 seconds to give time for registration, transfer and removal of chips from all three sectors of the machine before the signal again goes positive to provide a signal to AND gate 136 permitting the cycle to start all over again with a new chip from hold station 58.
  • a chip As a chip is driven into position into engaging means 65 of elevator 64, as shown in FIG. 3, it will close a microswitch 166 to energize single shot generator 167 of FIG. 5a in turn providing a signal to elevator motor 168 which causes the chip in the elevator to be driven to the top thereof.
  • the elevator may have the capacity to hold more than one chip at a time. The important thing is that when a chip is inserted in the bottom of the elevator, it will be raised immediately to provide room for the next chip. When a chip reaches the top of the elevator, it will be engaged by articulated dogs on one of endless belts 66, 67 and 68 which are continuously driven as by motor 169, 171 and 172, respectively.
  • a dog from one of the belts will engage the chip and move it to the appropriate hold-to-clean station and/or cleaning station so that any residue toner material may be cleaned from the chip and they will then be returned to their respective storage stations 40, 40' and 40".
  • a chip which originated from storage station 40 will be moved by belt 66 to hoId-to-clean station 73 where it will be moved through cleaning station 75 back to storage station 40, as described above.
  • a chip which originated from storage station 40 will be moved by belt 67 directly into cleaning station 75' and back to storage station 40'.
  • a chip which originated from storage station 40" will be moved by belt 68 to hold-to-clean station 77 where it will be moved through cleaning station 75" back to storage station 40
  • suitable rails and guides for supporting the chips as they are moved from station to station may be provided as will be apparent to one skilled in the art.
  • the endless belts and drive means will be provided with suitable bearings and mounting supports as needed. If desired, some suitable means other than the belts shown may be used to advance the chips.
  • the time periods given for the various operating signals are purely arbitrary and could be varied considerably as required for a particular requirement.
  • FIG. 6 An alternative electrophotographic apparatus A is shown in FIG. 6 wherein separate exposure and transfer stations are used for each stack or set of chips.
  • the chips may be fed sequentially from each of storage stations or storage positions 175, 175' and 175", respectively, by means, such as articulated dogs, on endless belts 176, 176 and 176" to a position where they are engaged by dogs on continuously moving endless belts 177, 177' and 177". Then the chips are driven past charging stations 178, 178 and 178", respectively, where an electrostatic charge is placed on the photoconductive surface of each chip.
  • the charged chips are fed into respective elevators 179, 179' and 179" where they are lowered onto intermittently driven belts 181, 181' and 181" which move the respective chips to exposure stations 182, 182 and 182".
  • Light from a light source 183 is directed through negative and lens 13 and through a color separation system, such as a dichoric beam splitter 184 which reflects light at one frequency, such as blue light, to a. mirror 185 to form an image on a photoconductive chip at exposure station 182".
  • the rest of the light passes through beam splitter 184 to a beam splitter 186 where light of another frequency, such as green light, is reflected onto mirror 187 to form another image on the photoconductive chip at exposure station 1 82'.
  • the remainder of the light i.e.
  • the red light passes through beam splitter 186 to'form a third image on the photoconductive chip at station 182.
  • electrostatic images are formed on each chip corresponding to the color separation originals from negative 10.
  • the beam splitters and mirrors are so arranged that the length of the optical path for each color of light is the same.
  • the exposure time at each exposure station will be controlled by the density of the image being projected and by the color projected onto each photoconductive chip. This may be controlled by individually actuated shutter (not shown) interposed between beam splitter 186 and exposure station 182 and 182', respectively, and a shutter interposed between beam splitter 184 and exposure station 182". This may be accomplished by use of an exposure control, such as that disclosed in U.S. Pat. No. 3,32l,307, discussed above with respect to the embodiment of FIG. 3.
  • intermittently driven belts 181, 181' and 181" are again energized to move the chips toward development stations 188, 188' and 188", respectively, as a second set of chips is moved from the bottom of the elevators to the respective exposure stations.
  • the first set of chips are engaged by articulated dogs 189 on continuously moving endless belts 191, 191' and 191", respectively, as best shown in FIG. 6a, which moves them across the development station, wherein the electrostatic image thereon is toned, and then are moved into transfer stations 192, 192 and 192".
  • the developed image on each of these chips is then transferred to a receiver, such as receiver 193 on roller 194 which is driven across the chips by endless belt 195 for transfer, in a manner such as that disclosed in commonly assigned U.S. Pat. application Ser. No. 741,387, filed on even date herewith, entitled Image Transfer Mechanism to Oliver W. Gnage.
  • the images on each of the chips is transferred to the receiver in succession and in registry as the roller moves across the chips.
  • the chips are moved by endless belts 196, 196 and 196" to elevators 197, 197 and 197", respectively.
  • the elevators are intermittently driven to move the chips upwardly whenever a chip is received in the bottom of the elevator.
  • the chips reach the top, they are picked off by dogs on continuously driven endless belts 198, 198' and 198" through cleaning stations 199, 199' and 199", respectively, back to the top of storage stations 175, and 175".
  • the chips are stationary at both the exposure and transfer stations but move through the charging, development, and cleaning stations. With the arrangement shown, the chips may be cycled so that they arrive at all three transfer stations substantially simultaneously so that transfer may take place immediately. Also, the cycling between chips of the same set is such that as soon as the image has been transferred from a chip and it has been moved out of the transfer station, the next chip is ready to move into the transfer station. Also, to shorten the transfer time even more, the chips may be cycled so that a chip is received in the exposure station closest to the transfer means (transfer station 192" in FIG. 6) so that transfer may begin while chips are still moving into each of the other transfer stations. In other words, transfer of the first image can commence as soon as the other chips have reached a position in the developing station which assures that they will be in the transfer station in time to be transferred.
  • the number of chips in each set depends on the charge, exposing, developing, transferring, and cleaning times.
  • the minimum number of chips in each set required for the cycle to be repeated continuously can be calculated by assuming minimum exposure time for every exposure.
  • additional chips may be added to each set to decrease the frequency of exposure of any one chip so that the number of prints that can be made from a given set of chips corresponds to a convenient interval at which all the chips can be changed, such as once a day or once a week.
  • single shot generator 200 is adapted to produce an output having a duration of approximately 0.l seconds from its one" output whereas single shot generator 201 will give a signal from its zero" output of approximately a 1 second duration before the signal goes back to the positive state and single shot generator 202 will give a signal from its zero output for a period of approximately 2 seconds before it goes positive providing three distinct impulses to OR gate 203 which are spaced approximately 1 second apart.
  • OR gate 203 will generate a signal to a single shot generator 204 which will provide a signal of slightly less than I second to charge insertion motor 205 which drives belts 176, 176' and 176" incrementally to successively move chips from storage chambers 175, 175' and 175" of FIG. 6.
  • the closing of the starting switch will cause a chip to be ejected simultaneous from each of the three storage chambers to begin the continuous operation of the machine.
  • the chip in one of the elevators When the chips are positioned in the elevator, the chip in one of the elevators, such as elevator 179, will close a microswitch 209, as shown in FIG. 6, to provide a signal to AND gate 211 of FIG. 7 which will provide an output signal if no chip is present in the exposure chamber and if no chip is being driven out of the storage chamber. Since this is the first cycle, this condition will be met and AND gate 211 will transmit a signal to single shot generator 212 which will provide an output signal of say 0.25 seconds to elevator drive motor 213 which will move the chips in the elevators down to the exposure station level.
  • This signal together with a signal from solenoid 222 will cause AND gate 225 to provide signals to AND gates 226, 227 and 228, respectively, as well as to exposure monitoring station 229.
  • the output signals from AND gates 226, 227, and 228 will energize solenoids 231, 232 and 233 to open shutters (not shown) to expose the charged photoconductive surfaces of the chips in the respective exposure stations to color separation images from negative 10 to form corresponding electrostatic images thereon.
  • the length of time each chip is illuminated by energization of the respective solenoids is controlled by an exposure control system, such as that disclosed in U.S. Pat. No. 3,32l,307, discussed above, which forms a part of exposure monitoring station 229.
  • switch 209 at the top of elevator 179 may be closed by manual means (not shown) and the negative ready-to-print switch (not shown) may be held closed so that the sets of chips dispersed through the machine may be fed through the rest of the cycle and back to their respective storage stations.
  • solenoid 238 For convenience of illustration, only solenoid 238 has been shown in FIG. 8.
  • the output signal from solenoid 238 will be supplied to AND gate 241 which will also receive an input signal from microswitch 242 of FIG. 6 which is closed by transfer roller 194 when the transfer roller is in starting position as shown in FIG. 6.
  • a signal from AND gate 241 will energize transfer roller motor 243 which, through belt 195, will move the transfer roller across the respective transfer stations so that the toner images are sequentially transferred onto receiver 193 in registry.
  • microswitch 244 When the transfer roller has moved past all the transfer stations, it will close microswitch 244 providing a signal to AND gate 245 of FIG. 8 which now energizes single shot generator 2460f a duration of say 0.5 seconds.
  • This signal causes AND gate 237 to discontinue the signal to transfer registration clamp 238 so that it is released and causes AND gate 247 to provide a signal to transfer station exit motor 248 which through endless belts 196, 196' and 196" drives the respective chips into elevators 197, 197' and 197" as shown in FIG. 6.
  • microswitch 249 When the chips reach the respective elevators, one of the chips will close a microswitch, such as microswitch 249, in elevator 197 to energize single shot generator 251 of FIG. 8a for approximately 1.0 seconds causing elevator transfer motor 252 to lift the chips to the top of the elevator by means of endless belts 253, 253' and 253" which each have chip gripping means 254, 254 and 254" thereon for engaging the chips.
  • this FIG. 6 is purely schematic and that any type of suitable elevator means may be used for raising the chips.
  • the elevators may hold a plurality of chips at one time. The important thing is that as soon as a set of chips are received in the bottom of the elevators, motor 252 is energized to raise the chips so that another set of chips may be inserted therein. 7
  • suitable rails and guides may be provided for supporting the chips as they are moved from station to station as will be apparent to one skilled in the art.
  • the endless belts and drive means may be provided with suitable bearings and mounting supports as needed. If desired, some suitable means other than the belts shown may be used to advance the chips from one station to another.
  • the time periods given for the various operating signals are purely arbitrary and could be varied as needed for a particular application.
  • the chips are then engaged by similar dogs on continuously running belts 260, 260' and 260" all driven by motor 261, which drives the chips past charging stations 262, 262' and 262", respectively, wherein an electrostatic charge is placed on the photoconductive surface of each chip.
  • motor 258 upon closing a starting switch, such as switch 81 of FIG. 4, motor 258 is energized.
  • a chip from storage station 256 will close a microswitch 263 to energize motor 258' to feed a chip fromstorage chamber 256.
  • the chip from storage chamber 256 will close a microswitch 263.
  • Belts 260, 260 and 260" move the respective chips into holding stations or hold-to expose station 264, 264 and 264" where they are held until each chip can be sequentially moved to a stationary exposure station by an elevator to be described.
  • the chips are sequentially moved from the hold-to-expose stations by intermittently driven belts 265, 265' and 265" each having dogs which engage the chips and each being driven by motors 266, 266' and 266".
  • microswitch 267 energizing motor 266 to move the chip to the top of elevator 268.
  • microswitch 267 is closed to energize motor 266' to move the chip to the top of the elevator.
  • microswitch 267 is closed thereby energizing motor 266 so that the chip is moved to the top of elevator 268.
  • each chip is moved down to exposure station 269 where itis exposed to a light image projected from film through lens 13.
  • the chip will close microswitch 270 which will energize solenoid 271 to register the chip against pins 272.
  • each chip is at the exposure station will depend on the color of the light image to which it is exposed and also the density of that image. Thus, cycle time for each chip will be different at the exposure station. This difference in time is compensated for at hold-to-exposestations 264, 264 and 264" and at escape-to-develop stations 273, 273' and 273" to which the respective chips are driven by endless belts 274, 274' and 274" by intermittently driven motor 275.
  • Each of these belts has spaced dogs, such as dogs 276, 276' and 276" which are adapted to engage openings in respective chips that they are moved to the appropriate development station.
  • the chips from storage station 256 have an opening 277 locatedon one corner adjacent the marginal edge thereof which is adapted to be engaged by dog 276 of drive belt 274 so that when a chip from this set is in the exposure station, it will be driven from the exposure station to the escape-to-develop station 273, as shown in FIG. 9.
  • the set of chips from storage station 2561 are provided with an opening 278 in a center portion of the marginal edge, as shown, for engagement by dogs 276 of intermittent drive 274 so that when one of these chips is in exposure station it will be driven to escapefor-transfer station 273'.
  • the chip from storage station 256" has an opening 279 in a corner adjacent the marginal edge thereof which is engageable by dogs 276" of intermittent drive 27 through those chips from the exposure station to escape-for-develop station 273".
  • microswitch 281 energizing motor 282 which drives endless belts 283, 283' and 283" so that the respective chips in each escape station is engaged by articulating dogs 284, 284' and 284" to move each of them across development stations 285, 285' and 285", wherein the electrostatic image thereon is toned, and then to move them to respective transfer stations 286, 286' and 286".
  • microswitch 288 in transfer station 286 is closed by the presence of a chip in that station, solenoids 289, 289' and 289", respectively, will be energized to force the chips against registration pins 290, 290' and 290".
  • the developed image on each of these chips is then transferred to a receiver, such as receiver 291 on roller 292 which is driven across the chips by endless belt 293 connected to motor 294.
  • a receiver such as receiver 291 on roller 292 which is driven across the chips by endless belt 293 connected to motor 294.
  • Such transfer may take place in a manner such as that disclosed in commonly assigned US Pat. application Ser. No. 741,387, filed on even date herewith, entitled Image Transfer Mechanism" to Oliver W. Gnage. Transfer will take place when microswitch 295 is closed indicating that a transfer roller is in position for transfer.
  • the image is on each of the chips is transferred from the receiver in succession and in registry as the roller moves across the chips.
  • roller 292 will close a microswitch 296 energizing motor 297 so that the chips are driven by belts 298, 298 and 298", respectively, from the respective transfer stations to elevators 299, 299' and 299".
  • the elevators are driven by motor 300 which is energized as by a chip engaging microswitch 301 at elevator 299.
  • the elevators move the chips to the top, where they are picked up by dogs on endless belts 302, 302' and 302", which are driven continuously by motor 303.
  • the chips are moved past cleaning stations 304, 304' and 304", so that any residual toner may be removed from the photoconductive surface thereof, and back to the top of storage stations 256, 256 and 256", respectively.
  • circuit logic applicable to the charging and exposure mechanism disclosed in FIG. 9 is substantially identical to that shown in FIGS. 4, 4a, 4b and 4c, whereas the logic circuitry applicable to the transfer mechanism of FIG. 9 is substantially identical to that of FIGS. 8 and 8a. Therefore, a detailed discussion of the specific circuitry for this embodiment will not be given since the analogies to the other embodiments are obvious.
  • the chips are stationary in both the exposure and transfer stations while work is done on the chips but they move continuously through the charging, development and cleaning stations. With the arrangement shown, the chips may be cycled so that they arrive at all three transfer stations substantially simultaneously so that transfer may take place immediately. Also, the cycling between chips of the same set is such that as soon as the image has been transferred from a chip and it has been moved out of the transfer station, the next chip is ready to move into the transfer station. Also, to shorten the transfer time even more, the chips may be cycled so that a chip is received in the exposure station closest to the transfer means (transfer station 288" of FIG.
  • An electrophotographic apparatus has been provided wherein a plurality of stacks or sets of photoconductive chips are provided which may be exposed to different images which are in turn transferred in registry to a receiver.
  • This system contemplates both stations in which the chips are stationary and stations in which they are moving.
  • passive escape and hold stations are provided between the active stations wherein the photoconductive chip is stationary to permit efficient machining cycling so that the most prints may be made in the shortest time.
  • separate exposure and transfer stations are provided for each set of chips. With this arrangement, all stations may be active ones but at some the chips are stationary and at others the chips are in motion.
  • a single exposure station is used in conjunction with passive hold and escape stations whereas transfer is made at separate transfer stations which require no hold stations. In this case there will be passive stations in the vicinity of the exposure station but not in the vicinity of the transfer stations.
  • An electrophotographic device for printing at least two toner images, from at least two radiation patterns, in registry with each other on a receiver, wherein said device includes:
  • image forming means including exposing means
  • first and second photoconductor means movable through each of said means in a time interval to form, tone and transfer said two toner images to said receiver;
  • said first and second photoconductive means includes first and second sets of separate photoconductive chips.
  • a device for printing at least two images, from at least two radiation patterns, in registry with each other on a receiver said device including:
  • image forming means including exposing means; at least one developing station; transfer means; first and second sets of photoconductive elements movable in time intervals through said exposing means, said developing station and said transfer means, respectively;
  • a device for printing at least two images, from at least two radiation patterns, in registry with each other on a receiver said device including:
  • image forming means including exposing means
  • first and second sets of photoconductive elements said first set being movable in time intervals through said exposing means, said first developing station, said transfer means, and said first cleaning station, said second set being movable in time intervals through said exposing means, said second developing station, said transfer means, and said second cleaning station;
  • said elements of said first and second sets being continuously movable through said first and second charging stations, respectively, and being intermittently movable through said single exposure station in alternating relationship.
  • said elements of said first and second sets being continuously movable through said first and second developing stations, respectively, and being intermittently movable through said single transfer station in alternating relationship to transfer developed images from said elements onto a receiver in registry.
  • a device as claimed in claim 7, further including:
  • first and second hold-to-transfer stations between said single transfer station and said first and second developing stations, respectively, for holding a developed element of one set while an image on a developed element of the other set in said transfer station is transferred to said receiver.
  • a device as claimed in claim 7, further including:
  • first and second escape-to-clean stations between said single transfer station and said first and second cleaning stations, respectively, for holding said elements from said first and second sets, respectively, after transfer prior to movement through said respective cleaning stations.
  • said transfer means includes:
  • first and second transfer stations said elements of said first and second sets being intermittently movable through said first and second transfer stations, respectively.
  • first and second hold-to-expose stations between said single exposure station and said first and second charging stations, respectively, for holding a charged element of one set while a charged element of the other set is in said exposure station.
  • first and second escape-to-develop stations between said single exposure station and said first and second developing stations, respectively, for holding said elements of said first and second sets, respectively, after exposure prior to movement through said respective developing station.
  • said elements of said first and second sets being continuously movable through said first and second charging stations, respectively, and being intermittently movable through said first and second exposure stations, respectively;
  • said transfer means includes:
  • first and second transfer stations said elements of said first and second sets being intermittently movable through said first and second transfer stations, respectively.
  • a device for printing three images from three color separation images in registry with each other on a receiver to make a composite color print comprising:
  • first, second and third hold-for-expose stations intermediate said exposure station and said first, second and third charging stations, respectively, for holding charged chips, said chips being moved into said exposure station in turn from each of said hold-for-expose station;
  • first, second and third hold-for-transfer stations intermediate said transfer station and said first, second and third developing stations, respectively, for holding developed chips, said chips being moved into said transfer station in turn from each of said hold-for-transfer stations so that transfer of successive images from said chips to said receiver occurs substantially continuously.
  • a device as claimed in claim 14, wherein:
  • each of said chips is primarily photosensitive to one of said color separation images
  • each of said developing station tones electrostatic images formed from said color separation images with a toner having a color complementary to the color of said color separation images, respectively.
  • a device for printing three images from three color separation images inregistry witheach other on a receiver to make a composite color print comprising:
  • first, second and third sets of separate photoconductive chips movable from their respective storage stations through the other respective stations;
  • a device for printing three images from three color separation images in registry with each other on a receiver to make a composite color print comprising:
  • first, second and third sets of separate photoconductive chips movable seriatum through said respective stations means for moving said chips continuously through their respective charging, developing and cleaning stations and for moving said chips intermittently through said exposure station and said respective transfer stations; and means for varying the time interval each of said chips are in said exposure station in accordance with the color and density of their respective color separation images.
  • An electrophotographic apparatus having:
  • a plurality of active stations including a charging station, an exposure station, a developing station, a transfer station and a cleaning station;
  • At least one passive holding station serving as a buffer between adjacent active stations wherein the first of said adjacent active stations to do work on said photoconductive member is one of said relative moving stations and the other of said adjacent stations is one of said stationary stations.
  • electrophotographic apparatus as claimed in claim 18, wherein the improvement further includes:
  • An electrophotographic apparatus for printing three images from three color separation original images in registry with each other on a receiver to make a composite color print, said apparatus having:
  • each set of stations including a charging station, an exposure station, a developing station, a transfer station, and a cleaning station;
  • each set being sensitive primarily to one of said three color separation original images and movable relative to some of said active stations while work is performed thereon and stationary relative to other of said active stations while work is performed thereon;
  • said stationary stations include a single exposure station common to all three sets of stations;
  • said first holding stations being between said respective charging stations and said single exposure station and holding the charged chips, respectively, of any two of said sets of chips while a chip of the third set is being exposed.
  • An electrophotographic apparatus as claimed in claim 21, the improvement further including:

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Color Electrophotography (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
US741359A 1968-07-01 1968-07-01 Method and apparatus for making composite electrophotographic prints Expired - Lifetime US3583807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74135968A 1968-07-01 1968-07-01

Publications (1)

Publication Number Publication Date
US3583807A true US3583807A (en) 1971-06-08

Family

ID=24980398

Family Applications (1)

Application Number Title Priority Date Filing Date
US741359A Expired - Lifetime US3583807A (en) 1968-07-01 1968-07-01 Method and apparatus for making composite electrophotographic prints

Country Status (6)

Country Link
US (1) US3583807A (de)
AT (1) AT310557B (de)
BE (1) BE735429A (de)
DE (1) DE1932964A1 (de)
FR (1) FR2012092A1 (de)
GB (1) GB1278792A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780214A (en) * 1970-08-17 1973-12-18 Agfa Gevaert Ag Method and apparatus for making color prints on paper
US3819263A (en) * 1972-03-27 1974-06-25 Xerox Corp Cleaning apparatus
JPS49111639A (de) * 1973-02-21 1974-10-24
JPS5017844A (de) * 1973-06-15 1975-02-25
JPS50123345A (de) * 1974-03-13 1975-09-27
US4011568A (en) * 1974-11-01 1977-03-08 Colorkrome, Inc. Electrophotographic camera
US4167323A (en) * 1977-10-03 1979-09-11 Eastman Kodak Company Reproduction apparatus for producing simplex or duplex copies
US4561646A (en) * 1984-08-30 1985-12-31 Eastman Kodak Company Sheet registration mechanism
US20030147101A1 (en) * 2002-02-06 2003-08-07 Quad/Tech, Inc. Camera assembly for a printing press
US7013803B2 (en) 2002-02-06 2006-03-21 Quad/Tech, Inc. Color registration control system for a printing press

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2065614C3 (de) * 1970-04-02 1982-10-07 Canon K.K., Tokyo Elektrophotographisches Mehrfarbenkopiergerät
US4603336A (en) * 1984-04-25 1986-07-29 Harris Graphics Corporation Transfer mechanism for multiple station imaging/printing apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780972A (en) * 1953-09-29 1957-02-12 Polaroid Corp Photographic apparatus and process
US3357830A (en) * 1961-08-03 1967-12-12 Xerox Corp Dyed image xerography
US3399611A (en) * 1965-10-23 1968-09-03 Owens Illinois Inc Electrical printing methods and apparatus
US3414353A (en) * 1965-04-12 1968-12-03 Eastman Kodak Co Web driving mechanism
US3447871A (en) * 1965-01-04 1969-06-03 Ilford Ltd Photographic colour printers and processes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780972A (en) * 1953-09-29 1957-02-12 Polaroid Corp Photographic apparatus and process
US3357830A (en) * 1961-08-03 1967-12-12 Xerox Corp Dyed image xerography
US3447871A (en) * 1965-01-04 1969-06-03 Ilford Ltd Photographic colour printers and processes
US3414353A (en) * 1965-04-12 1968-12-03 Eastman Kodak Co Web driving mechanism
US3399611A (en) * 1965-10-23 1968-09-03 Owens Illinois Inc Electrical printing methods and apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780214A (en) * 1970-08-17 1973-12-18 Agfa Gevaert Ag Method and apparatus for making color prints on paper
US3819263A (en) * 1972-03-27 1974-06-25 Xerox Corp Cleaning apparatus
JPS49111639A (de) * 1973-02-21 1974-10-24
JPS5017844A (de) * 1973-06-15 1975-02-25
JPS50123345A (de) * 1974-03-13 1975-09-27
US4011568A (en) * 1974-11-01 1977-03-08 Colorkrome, Inc. Electrophotographic camera
US4167323A (en) * 1977-10-03 1979-09-11 Eastman Kodak Company Reproduction apparatus for producing simplex or duplex copies
US4561646A (en) * 1984-08-30 1985-12-31 Eastman Kodak Company Sheet registration mechanism
US20030147101A1 (en) * 2002-02-06 2003-08-07 Quad/Tech, Inc. Camera assembly for a printing press
US7013803B2 (en) 2002-02-06 2006-03-21 Quad/Tech, Inc. Color registration control system for a printing press
US7253929B2 (en) 2002-02-06 2007-08-07 Quad/Tech, Inc. Camera assembly for a printing press

Also Published As

Publication number Publication date
DE1932964A1 (de) 1970-01-15
FR2012092A1 (de) 1970-03-13
AT310557B (de) 1973-10-10
GB1278792A (en) 1972-06-21
BE735429A (de) 1969-12-01

Similar Documents

Publication Publication Date Title
US3830590A (en) Sorter apparatus of printer system
US3583807A (en) Method and apparatus for making composite electrophotographic prints
US4664501A (en) Method of and apparatus for producing duplicates in color
US4218128A (en) Duplex copying machine
EP0073071B1 (de) Kopiergerät für die Erzeugung zweiseitiger Kopien von zweiseitigen Vorlagen
JPH023555Y2 (de)
US4521097A (en) Electrophotographic image recording method and apparatus
US3790273A (en) Electrophotographic duplicator of the transfer type
US3848989A (en) Multicolor electrophotographic reproduction device
US3649114A (en) Multiple output electrostatic recording system
US3744390A (en) Automatic coin-operated photographic apparatus utilizing self-developing film units
US3981577A (en) Optical system for an electrophotographic printing machine
US3876116A (en) Electronic photocopying machine
US4074934A (en) Electrostatographic imaging method and apparatus for multiple copies
US4610529A (en) Apparatus for recording color images
EP0004736B1 (de) Vorrichtung zur zeilenweisen Aufzeichnung von Bildern mit unterschiedlichen Farbauszügen
US3881817A (en) Optical alignment system for an original document
US3558224A (en) Photocopy machine having an input feed control
US3904290A (en) Optical system alignment apparatus
US3744389A (en) Automatic coin-operated photographic apparatus utilizing self-developing film units
EP0146945B1 (de) Elektrographisches Gerät
US3690759A (en) Electronic photocopying machine
JPS61270774A (ja) トナ−濃度制御装置
JPS6113228B2 (de)
JP2713668B2 (ja) フルカラー複写機