US2859673A - Electrophotographic printer - Google Patents

Electrophotographic printer Download PDF

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Publication number
US2859673A
US2859673A US419392A US41939254A US2859673A US 2859673 A US2859673 A US 2859673A US 419392 A US419392 A US 419392A US 41939254 A US41939254 A US 41939254A US 2859673 A US2859673 A US 2859673A
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United States
Prior art keywords
record
card
past
information
images
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Expired - Lifetime
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US419392A
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English (en)
Inventor
Ira M Hix
Martin J Kelly
Harold L Read
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International Business Machines Corp
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International Business Machines Corp
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Filing date
Publication date
Priority to BE536878D priority Critical patent/BE536878A/xx
Priority to NL195972D priority patent/NL195972A/xx
Priority to BE536877D priority patent/BE536877A/xx
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US419314A priority patent/US2807233A/en
Priority to US419392A priority patent/US2859673A/en
Priority to US419702A priority patent/US2909971A/en
Priority to GB8738/55A priority patent/GB766426A/en
Priority to GB8737/55A priority patent/GB768020A/en
Priority to FR1141378D priority patent/FR1141378A/fr
Priority to CH333952D priority patent/CH333952A/fr
Priority to CH333951D priority patent/CH333951A/fr
Application granted granted Critical
Publication of US2859673A publication Critical patent/US2859673A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/28—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 projection is obtained by line scanning
    • G03G15/30—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 projection is obtained by line scanning in which projection is formed on a drum
    • 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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
    • G03G15/167—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/14—Methods or arrangements for marking the record carrier in digital fashion by transferring data from a similar or dissimilar record carrier
    • G06K1/18—Methods or arrangements for marking the record carrier in digital fashion by transferring data from a similar or dissimilar record carrier by transferring data from one type of record carrier on to another type of record carrier, e.g. from magnetic tape to punched card
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • This invention relates to record controlled printing machines in general, and to record card controlled electrophotographic Dick Strip printers in particular.
  • the embodiment of this invention pertains to a selective printing xerographic machine capable of making a duplicate o-f information appearing on selected source reco-rds, such as record cards for example, onto a print receiving material, such as a Dick Strip for instance, whereon the selected imprints are successively arranged.
  • xerography is a term applied to a printing process in which electrostatic latent images are rendered visible by an electrically charged toner powder, the resulting powder image thereafter being transferred and fixed to a print receiving material.
  • a broad object of this invention is to provide a practicable electric printer which affords eicient and rapid printing operations that may be selectively controlled.
  • a still another object of this invention is to provide an improved apparatus for effecting a transfer of selected ones of a plurality of images onto a print receiving material.
  • the source records having the information thereon to be transferred are fed past an optical scanning station in an overlapping arrangement so that the entire surface of eachof the source records is not scanned, but instead only the general areas of information on the records are scanned optically.
  • the overlapping arrangement referred to is one wherein a next following card overlaps the preceding card so that the card area defined by the offset edges of the cards, is substantially the area of information to be scanned. Accordingly, another object of this invention is to provide appartus in an electrophotographic printer for projecting an image of select information appearing at a certain place, or places, on successively advanced records.
  • another object of this invention is to provide a record card feeding mechanism for advancing record cards past an optical scanning apparatus in an overlapping arrangement such that a next following card is positioned with respect to the preceding card in a manner to define the area to be scanned.
  • Fig. 1 is a somewhat diagrammatic View of a record card controlled electrophotographic Dick Strip printer.
  • Fig. 2 is a flow diagram depicting generally the operations required in order to place the image of source record information upon a print receiving material.
  • record cards 20 to be operated on are stackedy in hopper 21, and are fed, one by one, ve'ach card cycle out of hopper 21 towards stacker 22.
  • Successive pairsl of feed rolls through 102 cause a record card to be advanced during successive card cycles past reading brush station 23 and optical scanning station 24.
  • the aforesaid feed rolls are driven at speeds so that the cards are fed in seriatim past brush station 23 separately and successively, and past optical station 24 in an overlapping arrangement (see also Fig. 4)
  • a single light ray projector 25 for directing a band of light rays upon the constricted center of the aperture in member 26, to thereby effect a conventional light scanning operation whereby the image of the printed information, identified by reference numeral 41 in Fig. 2, on a record card 20 is transferred by mirrors 28 (Fig. 1) and 29 to the surface of xerographic drum 35.
  • the xerographic drum is mounted on a shaft 36 and is driven by an electric motor (not shown) in a counterclockwise direction.
  • This drum includes an electrically conducting cylinder 37 and a light sensitive photoconductive insulating printing plate 38.
  • the plate y is carried by a sheet of any flexible metal or other conductive material 39 that enables its being flexed around and attached to the cylinder 37.
  • electrostatic latent image corresponding to the optical image will remain on plate 38, this electrostatic latent image being one wherein the dark characters within printed information image areas identified by reference numeral 41a (Fig. 2) retain an electrical charge, and the light image areas corresponding to the record card surface having no printed information thereon are no longer charged.
  • the transfer roller comprises an innermetallic conductive portion 46 and an outer portion 47 of very resilient or yielding material having a high electrical resistance of at least 106 ohms per cubic centimeter, as for example, a layer of soft conducting rubber.
  • Transfer roller 45 is spring-biased in the direction of xerographic drum 35 so that web 48 is normally sandwiched between plate 38 and the surface of transfer roller portion 47.
  • the transfer roller is supported by shaft 49 thereof which, in turn, is journaled at each end in a pair of supporting arms 50 in a manner so that shaft 49 and roller 45 are electrically insulated from arms 50.
  • Inverted L-shaped arms 50 are pivotally mounted on shaft 55 which has an idler web feed roller 56 rotatably mounted thereon, and which is xed in conventional printing machine support frames (not shown).
  • the generally L-shaped armsl 50 will be positioned by the spring-biasing force so that transfer roller 45 supports web 48 in contact with plate 38.
  • the potential applied to transfer roller 45 will'cause the charged powder particles to migrate from the xerographic drum to the web.
  • camming mechanism 57 is operated so as to engage follower 58, and to thereby move transfer roller 45 a suicient distance away from xerographic drum 35.
  • a rotating plush roller 59 is provided in order to remove any toner powder which remains on the surface of plate 38 prior to the incremental areas thereof becoming charged again by ion-source charging unit 40.
  • This roller is positioned within a housing 60 for retaining the powder removed by the counterclockwise rotating action of the roller, 'fromthe Xerographic drum plate 38.
  • a vacuumV cleaner unit (not shown) is also associated with housing 60 in order to remove the powder therefrom.
  • the selectiveV printing operation is governed by a data compare apparatus identifiedV in Fig. 1 by reference numeral 65.
  • the comparing operation is such that as each card is fed past reading station 23, the coded indicia, for example perforations in accordance with the Vwellknown IBM code, in a selected control field 43 (see also Fig. 2) of the card, is compared by apparatus 65 with a designated standard data directed thereto by data emitter
  • An unmatched, or unequal, data condition during any card cycle will cause an electrical impulse to be directed to magnetic drum recording head 67, to thereby record al magnetic spot upon thev magnetizable surface of a magnetic storage drum 68.
  • This drum is also attached to shaft 36 so that drums 35 and 68 rotate in step with one another.
  • the selective printing operation does not necessarily need to be one wherein printing is suppressed consequent upon the detection of an unmatched data condition.
  • such operations may be effected as a result of the detection of any one of a plurality of predetermined relationships between separate groups of data.
  • the web punch mechanism identified by reference numeral 72 is used to perforate a Dick Strip hole 75 (see also Fig. 2) in web 48 while the web is in motion. That is, punch mechanism 72 causes a punch-in-iiight operation so that as web 48 is being advanced by the web drive mechanism from reel '76 past guide rollers 77, around idler roller 56 and Vtransfer roller 45, and past pressure xing Vrollers 7,8 and feed rollers and 81, to reel 79, a perforation 75 is placed in the web during the forward movement thereof.
  • a punching mechanism of this type is shown and described in Patent No. 2,136,210 issued Referring to Fig.
  • the punch mechanism movement is shown to be an oscillating orreciprocating one whereby the punch mecha nism 72 (see also Fig. 1) is advanced with the web during the first half of a machine cycle, and returned to a home, or starting, position during the last half of the machine cycle. It is also shown in Fig. 7 that punch 83 starts to perforate web 48 at 65 and is returned to the starting point at 111.
  • Web drive feed roller 81 (Fig. 1) which engages com-, panion roller 84B so as to advance the web and punch mechanism 72, are connected to the main drive mechanism (not shown) through a conventional ratchet type clutch.
  • the clutch magnet 124 thereof is shown in Fig. 3 to be included within control apparatus 71 so that whenever magnetic drum reading head 69 detects a magnetic spot on the surface of the drum, drive roller 81 and punch mechanism 72 are disconnected from the afore-mentionetl main drive mechanism.
  • Pressure fixing rollers 78 are utilized to fix those powder images transferred onto web 48..
  • a sufiicient line contact pressure of 500 pounds per lineal inch of contact, for example, will cause toner powder to iow into the bers of the web material.
  • rollers 78 are also connected to the main driveY mechanism by means of the afore-mentioned ratchet type clutch.
  • rollers 78 are driven in step with drive roller 81.
  • An oil pad 63 is provided to remove anyV excess powder which will cling to the upper fixing roller.
  • erase head 82 is provided so as to remove all magnetic spots applied to the surface of drum 68 by recording head 67, after these spots have been detected by reading head 69.
  • Card feed mechanism As stated hereinbefore, the record cards 20 (Fig. l) to be operated on are stacked in hopper 21, and are fed. one by one, each card cycle out of hopper 21 towards stacker 22 by means of successive pairs of feed rolls 85 through 102.
  • the c ard feed mechanism is basically al conventional one such as is used in record card sorters.Y
  • record cards are the well-known IBM tabulating cards, each of which is three and one-quarter inches in length.
  • the bottornmost card 20 is fed by a conventional picker such as is shown in J. J. Robbins et al. Patent No. 2,448,830 which issued on September 7, 1948, into the bite of a first set of feed rolls 85 and 86 having a peripheral speed of two thousand inches per minute. Successive feed rolls 87 through 92 also rotate at a peripheral speed of two thousand inches per minute.
  • feed rollers 85 through 92 cause five hundred cards per minute to be advanced past brush reading station 23.
  • the three and one-quarter inch cards are separated by a three-quarter inch spacing between the trailing edge of any one card and the leading edge of the next following card.
  • the tifth, sixth and seventh sets of feed rolls, i. e., feed rolls 93 through 98, respectively, are operated at a peripheral speed of six hundred and twenty-five inches per minute.
  • Feed rolls 99 and 100 are operated at a peripheral speed of twelve hundred fifty inches per minute whereas feed rolls 101 and 102are operated at a peripheral speed of twenty-tive hundred inches per minute, whereby the record cards in an overlapping arrangement, are separated. This of course, is for the reason that it is desirable to have the record cards 20 enter the stacker 22 one at a time in order to provide against card jams which might occur very frequently at high card feeding speeds, such as five hundred cards per minute for instance.
  • a mechanical storage device such as is shown in Fig. 5, may be used in place of camming mechanism 57 (Fig. 1), and will now be described.
  • Figs. l, 5 and 6 when a magnetic spot is detected by reading head 69, an electrical signal is caused to be applied to interposer magnet 105. The resulting energization of this magnet and attraction thereto of armature 104 will cause interposer 106 to be moved so that the operating end thereof is placed in the path of a lug 107 on a trip lever 108.
  • trip lever carrier 109 having trip levers 108 and stop blocks 110 attached thereto, rotates continuous ly, and in step with xerographic drum 35, the particular trip lever whose lug 107 is engaged by the interposer 106, is caused to pivot in a counterclockwise direction until the extended end of the trip lever engages stop block 110.
  • a trip lever in this position i. e., in an operating position, provides a camming end 111 which extends beyond an outer circumference of carrier 109. As carrier 109 rotates, this camming end subsequently engages the portion of arm 50, identified by reference numeral 112, so as to shift the transfer roller 45 away from xerographic drum 35.
  • carrier 109 has six trip levers 108 pivotally mounted thereon, the arrangement being such that the carrier is rotated at a Speed to complete one revolution for every six card feed cycles.
  • carrier 109 is attached to support plate 117 which, in turn, is fixed to rotatable shaft 118.
  • Bearing 119 is positioned between stationary support 116 and rotatable carrier 109.
  • a conventional card reading station 23 such as is shown in Phelps et al. No. 2,602,544 which issued on July 8, 1952, is employed to sense the perforated code indicia 43 (Fig, 2) in record cards 20 that are fed from hopper 21 to stacker 22.
  • Comparing apparatus 65 is comprised of existing data comparison circuits, such as those, for example, shown in the afore-mentioned Phelps et al. patent.
  • a plurality of comparison circuits, one for each card column representing a different order are connected in tandem to control comparison result means so that the relation of the values in the higher orders dominates the relation of values in the lower orders.
  • an electrical signal upon the detection of unmatched orders of data in any one of the higher order comparison circuits, an electrical signal will be directed from this circuit to the result means, and will be caused to bypass the succeeding comparison circuits.
  • Data emitter 66 is a conventional apparatus, one such emitter being shown and described in Rabenda et al. Patent No. 2,602,394 which issued on July 8, 1952. As is shown in Fig. 8a thereof, any digit and/or alphabetic character representing signals in accordance with the well-known IBM code, may be had every machine cycle. Thus, by permitting only predetermined standard data signals to be directed from emitter 66 to compare apparatus 65, and by comparing these selected data emitter signals with the signals resulting from the reading of selected control field 43 (Fig. 2) card columns at reading station 23 (see also Fig. 1), compare apparatus 65 may be controlled to direct an electrical pulse to magnetic ⁇ drum recording head 67. Inasmuch as the system for magnetic storage is also a conventional one, reference may be had to existing prior art, such as Patent No. 2,587,532 for example, issued to Schmidt on February 26, 1952, for suitable magnetic spot reading and recording circuits.
  • the control apparatus identified by reference numeral 71 in Fig. 1, is shown in detail in Fig. 3.
  • an electrical impulse is directed to an amplifier circuit 70.
  • This circuit directs a positive voltage signal of approximately 50 volts to the control grid 121 of gas tube G1 via a capactive coupling.
  • the anode 122 of tube G1 is connected to a +115 volt source through cam contacts C1 (see- Fig. 7
  • a main file of record cards may comprise names and addresses of magazine subscribers, for instance, and associated perforated indicia represented by reference numerals #i2V and 43 in Fig. 2.
  • reference numerals #i2V and 43 in Fig. 2 In theV normal course of business, all of theserecord cards in the main file would ordinarily be arranged alphabetically.
  • the record cards 28 (Fig. l) are fed past reading station 23 separately so that a comparison is effected every machine cycle with the pulses directed from data emitter 66, and past -optical station 24 in an overlapping arrangement Whereat the printed information image from every card is directed onto plate 38 of Xerographic drum 35.
  • a signal is 'applied to magnetic drum recording headr67 in order to cause a magnetic spot to be placed on the surface of magnetic drum 68. inasmuch as xerographic drumV 35 and magnetic drum 68 are both fixed to shaft 36 for rotation therewith, the aforesaid drums move in step with one another.
  • transfer roller 45 is in a position whereby web 48 is sandwiched between plate 38 and transfer roller 45 so as to effect a printing, or transfer, operation.
  • reading head 69 detects a magnetic spot on the surface of magnetic drum 68
  • the resulting signal which is applied to control apparatus 71 renders the web punch mechanism 72 and web drive mechanism 73 and 84 disabled, and the transfer roller camming mechanism identified generally by the reference numeral 57, operated.
  • the resulting action causes transfer roller 45 to be shifted away from Xerographic drum 35, whereby the powder image transfer process is stopped.
  • the transfer roller will remain in the latter designated non-print position in the event another magnetic spot is detected by 69, said another magnetic spot corresponding to a succeeding powder image tia on plate 38. And during the period that transfer roller 45 is in a non-print position, web 48 is braked by the cooperation between transfer roller 45 and braking member 74.
  • a record card controlled electrophotographic printer comprising record card indicia sensing means, record card printed information scanning means, means for feeding record cards past said sensing means and said scanning means, an electrostatically charged photoconductive member, an optical system for operatively connecting said scanning means and said member so as to impress electrostatic latent images of record card printed information on said member, means for developing the electrostatic latent images by applying a transferable powder thereto, means including a rotatable conductive cylinder for applying an electric forceV at a printing zone, means for moving said member relative to said cylinder in a timed relation to the feeding of record cards past said sensing means, means for feeding a print receiving material between said member and said cylinder in a timed relation to the movement of said member, whereby said cylinder is caused to rotate,rand means controlled by said sensing means for shifting said cylinder relative to said member so that the strength of the electric force at the printing zone is varied from one limit whereat powder images are caused to transfer from said member to said print receiving material, to another limit whereat the powder images
  • a record card controlled electrophotographic printer including record card indicia sensing means, and record card feeding means for moving record cards, one by one, past said sensing means; in combination with a rotatable member adapted to support charged powder images thereon; a normally voperative apparatus having a shiftable conductive cylinder to apply an electric force at a printing zone for transferring at said printing zone select ones of said charged powder images to a print receiving strip; means for rotating said image supporting member so that the surface thereof is moved relative to said conductive cylinder in a timed relation to the feeding of record cards past said sensing means; normally operative means for feeding said print receiving strip through said printing zone defined by the opposing surfaces of said image supporting member and said conductive cylinder and in a timed relation to the rotational movement of said member; and means controlled by said sensing means for shifting said conductive cylinder away from the surface of said image supporting member to suppress charged powder image transfer onto said print receiving strip, and for concurrently therewith rendering inoperative said print receiving strip feeding means.
  • a printer according to claim 1 additionally comprising means for permanently aiiixing to said print receiving material the powder images transferred thereto.
  • a printer according to claim l wherein said record feeding means includes successive sets of record feed rolls for advancing records past said indicia sensing means one by one and past said information scanning means in an overlapping arrangement such that one record is positioned to partially overlap an adjacent record so that the record information to be scanned on said one record is defined by said adjacent record.
  • a selectively operable transfer apparatus for producing optical images of said information, means for feeding records past said indicia sensing means and said information scanning means, electrostatically charged photosensitive means for storing electrostatic charge patterns of optical images projected thereon, means for operatively connecting said optical information scanning means and said electrostatically charged photosensitive means so that an electrostatic charge pattern corresponding to an optical image of record information is caused to be stored in said photosensitive means, means for developing the stored electrostatic charge pattern images of record information by applying a pigmented electroscopic material thereto, means for moving said photosensitive means so that the developed images of record information are moved past said transfer apparatus at a speed correlated with the speed of feeding records past said indicia sensing means, means for moving a copy sheet intermediate said photosensitive means and said transfer apparatus at a speed correlated with the speed of moving said photosensitive means, and means controlled by said indicia sensing means for governing the operation of said selectively
  • said photosensitive means so that the developed images of record information are moved past said transfer appmatus at a speed correlated with the speed of feeding records past said indicia sensing means, means for moving a copy Sheet intermediate said photosensitive means and said transfer apparatus at a speed correlated with the speed of moving said photosensitive means, means controlled by said indicia sensing means for governing the operation of said selectively operable transfer apparatus so that only select ones of the developed images of record information are transferred to a copy sheet, and means for removing from the surface of said photosensitive means the residual electroscopic material remaining on said photosensitive means after the operation of said transfer apparatus.
  • a record card controlled electrophotographic printer having ecord card sensing means, and record( card feed]- ing means for advancing the record cards past said sensing means, in combination with a movable member having a series of spaced charged powder images on the surface thereof, each of said images being associated with one of the record cards fed past said sensing means, a selectively operable powder image transfer means, means for moving said member relative to said transfer means so that the powder images are moved past said transfer means at a speed correlated with the speed of feeding record cards past said sensing means, means for moving a powder receiving material intermediate said member and said transfer means at a speed correlated with the speed of moving said member, and means governed by said sensing means for controlling said selectively operable transfer means so that only certain select powder images are transferred onto a power recelving material.
  • a record card controlled electrophotographic printer including record card indicia sensing means, and record card feeding means for moving record cards past said sensing means; in combination with a member adapted to support charged powder images thereon; a print receiving material; a normally operated apparatus effective to apply an electric force at a printing zone for transferring at said printing zone certain select ones of said charged powder images to the print receiving material; means for moving said charged powder image support ing member so that the images thereof are moved relative to said normally operated apparatus in a timed relation to the feeding of record cards past said sensing means; normally operated means for feeding said print receiving material through said printing Zone in a timed relation to the movement of said charged power image supporting member; and means controlled by said sensing means for rendering said normally operated apparatus disabled to suppress powder image transfer onto said print receiving material.
  • a selectively operable transfer apparatus for producing optical images of said information, means for feeding a record card past said indicia sensing means and said information scanning means every machine cycle, means for emitting predetermined control data every machine cycle, electrostatically charged photosensitive means for storing electrostatic charge patterns of optical images projected thereon, means for operatively connecting said optical information scanning means and said electrostically charged photosensitive means so that an electrostatic charge pattern corresponding to an optical image of record information is caused to be stored in said photosensitive means, means for developing the stored charge pattern images of record information by applying a pigmented electroscopic material thereto, means for moving said photosensitive means so that the developed images of record card information are moved past said transfer apparatus every machine cycle at a speed correlated with the speed of feeding record cards past said sensing means, means for moving a copy sheet intermediate said photosensitive means and said transfer apparatus at a speed correlated with the speed of moving said photosensitive
  • a cyclically operable record card controlled machine of the class described having record card indicia sensing means, record card information scanning means, and record card feeding means for advancing a record card past said sensing means and said scanning means every machine cycle; the combination of data manifesting means for emitting predeterminedV control data every machine cycle; electrostatically Vcharged photosensitive means for storing electrostatic charge patterns of'optical images projected thereon; means for operatively connecting said optical information scanning means and said electrostatically charged photosensitive means so that an electrostatic charge pattern corresponding to an optical image of record card information is caused to be stored in said photosensitive means every machine cycle; means for developing the stored electrostatic charge pattern images of record information by applying a pigmented electroscopic material thereto; a normally operated electroscopic toner material transfer apparatus; means for moving one of said developed images past said normally operated transfer apparatus every machine cycle at a speed correlated with the speed of feeding record cards past said sensing means; means controlled by said sensing means and said data manifesting means for comparing the record card indici
  • said transfer apparatus includes a shiftable conductive cylinder which is caused to rotate by the feeding movement of said print receiving strip in contact therewith; means for applying an electrical potential to said cylinder to transfer said transferable material from said charged powder image storing means onto' said print receiving strip; and a cammiug means controlled by said electrical governing means for shifting said cylinder toward said charged powder image storing means so as to effect printing, and away from said charged powder image storing means in order to suppress printing.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
US419392A 1954-03-29 1954-03-29 Electrophotographic printer Expired - Lifetime US2859673A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
BE536878D BE536878A (enrdf_load_stackoverflow) 1954-03-29
NL195972D NL195972A (enrdf_load_stackoverflow) 1954-03-29
BE536877D BE536877A (enrdf_load_stackoverflow) 1954-03-29
US419314A US2807233A (en) 1954-03-29 1954-03-29 Electrophotographic printing machine
US419392A US2859673A (en) 1954-03-29 1954-03-29 Electrophotographic printer
US419702A US2909971A (en) 1954-03-29 1954-03-30 Printing machine
GB8738/55A GB766426A (en) 1954-03-29 1955-03-25 Electrophotographic printing machine
GB8737/55A GB768020A (en) 1954-03-29 1955-03-25 Printing machine
FR1141378D FR1141378A (fr) 1954-03-29 1955-03-25 Dispositif d'impression xérographique à ruban épais
CH333952D CH333952A (fr) 1954-03-29 1955-03-28 Dispositif d'impression xérographique
CH333951D CH333951A (fr) 1954-03-29 1955-03-28 Dispositif d'impression xérographique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US419314A US2807233A (en) 1954-03-29 1954-03-29 Electrophotographic printing machine
US419392A US2859673A (en) 1954-03-29 1954-03-29 Electrophotographic printer

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US2859673A true US2859673A (en) 1958-11-11

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US419392A Expired - Lifetime US2859673A (en) 1954-03-29 1954-03-29 Electrophotographic printer
US419314A Expired - Lifetime US2807233A (en) 1954-03-29 1954-03-29 Electrophotographic printing machine

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US419314A Expired - Lifetime US2807233A (en) 1954-03-29 1954-03-29 Electrophotographic printing machine

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US (2) US2859673A (enrdf_load_stackoverflow)
BE (2) BE536878A (enrdf_load_stackoverflow)
CH (2) CH333952A (enrdf_load_stackoverflow)
FR (1) FR1141378A (enrdf_load_stackoverflow)
GB (2) GB766426A (enrdf_load_stackoverflow)
NL (1) NL195972A (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956487A (en) * 1955-03-23 1960-10-18 Rca Corp Electrostatic printing
US3009402A (en) * 1957-06-03 1961-11-21 Xerox Corp Xerographic processing apparatus
US3023670A (en) * 1959-08-31 1962-03-06 Romero Cora Lora Automatic symbol reproducing device
US3040322A (en) * 1958-08-15 1962-06-19 Baldwin Piano Co Device and method for producing code members
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US2956487A (en) * 1955-03-23 1960-10-18 Rca Corp Electrostatic printing
US3009402A (en) * 1957-06-03 1961-11-21 Xerox Corp Xerographic processing apparatus
US3040322A (en) * 1958-08-15 1962-06-19 Baldwin Piano Co Device and method for producing code members
US3052155A (en) * 1958-09-11 1962-09-04 Bruning Charles Co Inc Apparatus for exposing light sensitive sheets and/or webs
US3062094A (en) * 1958-12-29 1962-11-06 Xerox Corp Electrophotographic copying apparatus
US3023670A (en) * 1959-08-31 1962-03-06 Romero Cora Lora Automatic symbol reproducing device
US3051044A (en) * 1959-09-09 1962-08-28 Gen Dynamics Corp Recording and projection system
US3075493A (en) * 1959-09-14 1963-01-29 Xerox Corp Xerographic apparatus with web cutting means
US3100426A (en) * 1960-04-26 1963-08-13 Edward K Kaprelian Electrophotographic printers
US3186838A (en) * 1960-12-27 1965-06-01 Xerox Corp Xerographic plate cleaning method utilizing the relative movement of a cleaning web
JPS5113079Y1 (enrdf_load_stackoverflow) * 1967-03-25 1976-04-08
US3543290A (en) * 1967-09-20 1970-11-24 Ricoh Kk Optical scanner and slit exposure device for reproduction apparatus
US3854975A (en) * 1971-06-30 1974-12-17 Addressograph Multigraph Pressure fixing of toners
US3847119A (en) * 1972-03-27 1974-11-12 Xerox Corp Transfer roller assembly
JPS4990946A (enrdf_load_stackoverflow) * 1972-12-11 1974-08-30
JPS5012738U (enrdf_load_stackoverflow) * 1973-05-31 1975-02-10
US3975715A (en) * 1973-10-25 1976-08-17 Xerox Corporation Scanning and selection methods and apparatus therefor
FR2360110A1 (fr) * 1976-07-30 1978-02-24 Canon Kk Appareil d'impression electrostatique a grande vitesse

Also Published As

Publication number Publication date
CH333951A (fr) 1958-11-15
GB768020A (en) 1957-02-13
US2807233A (en) 1957-09-24
BE536877A (enrdf_load_stackoverflow)
FR1141378A (fr) 1957-09-02
NL195972A (enrdf_load_stackoverflow)
BE536878A (enrdf_load_stackoverflow)
CH333952A (fr) 1958-11-15
GB766426A (en) 1957-01-23

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