US2889758A - Electrophotographic printer - Google Patents

Electrophotographic printer Download PDF

Info

Publication number
US2889758A
US2889758A US477556A US47755654A US2889758A US 2889758 A US2889758 A US 2889758A US 477556 A US477556 A US 477556A US 47755654 A US47755654 A US 47755654A US 2889758 A US2889758 A US 2889758A
Authority
US
United States
Prior art keywords
record
electrophotoplate
contacts
xerographic
cycle
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
US477556A
Other languages
English (en)
Inventor
Wallis D Bolton
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US477556A priority Critical patent/US2889758A/en
Priority to FR1160648D priority patent/FR1160648A/fr
Application granted granted Critical
Publication of US2889758A publication Critical patent/US2889758A/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
    • G03G15/28—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
    • 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 electrophotographic printing machines in general, and to electrophotographic document originating machines in particular.
  • xerography is a term applied to a printing process in which latent electrostatic images are rendered visible by a pigmented electroscopic powder, often referred to as xerographic toner, the resulting electroscopic powder image being transferred and thereafter afiixed to a print receiving material so as to afford a permanent printed copy which depicts the latent electrostatic image.
  • An apparatus employing such a printing process is shown and described in Carlson Patent No. 2,357,809, issued on September 12, 1944.
  • the steps followed in this printer include electrically charging an electrophotoplate having a photoconductive layer on an electrically conductive backing member, exposing the charged plate to an optical image so as to form a latent electrostatic image thereon, dusting the latent electrostatic image with xcrographic toner in order to develop this image so that the configuration thereof is visible, transferring the xerographic toner onto a print receiving material, such as paper for example, and removing any excess toner remaining on the electrophotoplate after the preceding transfer step and prior to the next electrophotoplate charging step.
  • a print receiving material such as paper for example
  • xerographic printer employing a printing process somewhat different than the aforementioned Carlson one, is shown and described in Schaifert Patent No. 2,576,047, issued on November 20, 1951.
  • This printing machine embodies a continuously rotating drum on which an electrically insulating or non-conducting image layer is secured.
  • This image layer of permanent design is electrostatically charged prior to being dusted with xerographic tones.
  • the toner will be attracted to and will adhere to the charged surface area of the permanent design image layer so that when the toner is transferred onto a print receiving material, the xerographic toner so transferred will define a configuration corresponding to the image layer of permanent design.
  • xeroprinting This type of printing is commonly referred to as xeroprinting in order to distinguish the same from other types of xerographic printing. It is to be observed that a xeroprinting machine is in essence a printing duplicator because any number of copies may be produced from a single permanent design image layer.
  • This invention pertains to a xerographic printing machine for originating documents each of which may bear different information.
  • the preferred embodiment of this invention is a xerographic document originating machine which comprises a continuously rotating drum having an electrophotoplate thereon that includes a photoconductive layer on an electrically conductive backing member.
  • a permanent design image layer of insulating material is formed on the electrophotoplate to represent information from a first source, such as a record.
  • This record may have the format of a letter lacking the heading thereof, for example, and the body of which is directed to a particular group or class of persons, such as doctors for instance.
  • a nonpermanent xerographic image is developed on the electrophotoplate within the limits of the permanent design image layer, to represent information from a second source such as another record.
  • This latter record has the heading information pertaining to a single recipient of the afore-mentioned letter and, of course, there are a plurality of these latter records. Since the so-called non-permanent xerographic image is literally erased each machine cycle, a new heading is developed each machine cycle. As a result, after the first cycle the documents originated during each print impression operation are in effect so-called form-letters each consisting of common body information and a different heading.
  • the permanent design image layer of insulating material is automatically removed from the photoconductive layer of the electrophotoplate, to thereby prepare the plate for another series of machine operations.
  • An object of this invention is to provide an improved original document printing machine.
  • Another object of this invention is to provide an original document printing machine employing electrophotographic principles.
  • a still another object of this invention is to provide an improved method of printing.
  • Another object of this invention is to provide a xerographic printing machine wherein a permanent design image layer of insulating material is formed on an electrophotoplate prior to a first print operation, and is automatically removed from the electrophotoplate after the last print operation.
  • Another object of this invention is to provide an electrophotographic printing machine for preparing original documents bearing information from two separate sources of input.
  • Yet another object of this invention is to provide an improved printing machine for preparing original documents in accordance with a print impression master plate having both permanent and non-permanent design image layers thereon.
  • Fig. 1 is a somewhat diagrammatic view of an electrophotographic document originating machine.
  • Fig. 2 depicts the steps that take place during the 1st, 2nd, nth and nth+1 machine cycles.
  • Fig. 3 shows a format record, heading record cards and an original document as prepared by the electrophotographic printing machine.
  • Fig. 4 is a diagrammatic view of the format record removing mechanism.
  • Fig. 5 is a diagrammatic view of an electrophotographic printer employing a cathode ray tube optical input.
  • Figs. 6a and 6b together form a wiring diagram of ti e control apparatus for governing the operation of the electrophotographic printer.
  • Fig. 7 is a block diagram of the motor drive.
  • Fig. 8 is a timing chart.
  • heading record cards 10 to be operated on are stacked in hopper 11 and are fed, one by one, each card cycle out of the hopper towards a stacker 12 by conventional picker mechanism.
  • Successive pairs of feed rolls 132tl cause a record card to be advanced during each card cycle past reading brush station 21 and optical scanning station 22.
  • the aforesaid feed rolls are driven at speeds whereby the record cards are fed past brush station 21 and optical station 22 at speeds correlated with the surface speed of xerographic drum 23.
  • a single light ray projector 24 for directing a band of light rays upon a constricted center of the aperture in member 26, to thereby effect a conventional light scanning operation of each record card 10 advanced past station 22, whereby an image of the record card printed information identified by reference numeral 27 (see also Fig. 3) is transferred to the photoconductive layer surface of the electrophotoplate 29 on xerographic drum 23.
  • the cylinder 33 of the xerographic drum is mounted for rotation on a shaft 28 and is driven by an electric motor 93 (Fig. 7) in a clockwise direction.
  • This drum has secured thereto an electrophotoplate 29 (Fig. 1), said plate consisting of a photeconductive layer 31 of amorphous selenium, for example, on an electrically conductive backing member 32 of aluminum, for example.
  • the plate 29 is flexed around cylinder 33 as shown, and is attached thereto in any one of the numerous conventional ways of attaching a printing plate to a supporting cylinder, such as by means of suitable clamping devices. It is important, however, that in whatever manner this attachment is made, it is necessary that the backing member 32 of the electrophotoplate 29 be in good electrical contact with the electrically grounded drum cylinder 33 connected to shaft 28.
  • a so-called format record 34 (see also Fig. 3) is caused to be moved during the first machine cycle from a feeding station 36 to a receiving station 37. In so doing, this record 34 is caused to move with the xerographic drum 23, and between the electrophotoplate 29 K and a transparent carrier belt 38.
  • the transparent belt is supported for movement by a couple of freely mounted wheels 39 and 41 each of which is carried by a respective shaft attached to a frame member 42 biased by springs 43 and 44 in a direction towards the outer surface of cylinder 33.
  • a steady light radiation of fairly constant intensity will be reflected from mirror 46 through lens 47 and transparent belt'38, and onto and through format record 34.
  • the xerographic drum 23 is driven in a clockwise direction by an electric motor via shaft 28.
  • the ion-producing charging unit 43 of the type shown and described in Carlson Patent No. 2,588,699, issued on March 11, 1952, the aforesaid layer is electrostatically charged.
  • cam 49 which isattached to shaft'28 for rotation therewith will act upon a rod 51 at approximately 71 (see also Fig. 8) so as to move the rod against the action of a biasing spring 52.
  • a slide gate 53 for normally preventing the format record 34 from extending beyond gate 53 and to a point between belt 38 and xerographic drum 23, is fixed to rod 51, the gate will be moved in a direction to create an opening for record 34. Due to the pushing action of biased record pusher 54 on the rearward end of format record 34, the forward end of this record will be moved into the bite of transparent carrier belt 38 and electrophotoplate 29.
  • pusher 54 is slideably mounted on the supporting frame 55.
  • the format record is released from feeding station 36 at a time the forward endof electrophotoplate 29 is slightly beyond the gate 53 and accordingly, record 34 will be moved with plate 29'past the afore-mentioned constant light radiation passing through the transparent carrier belt 38 in exposing station 25.
  • a developing chamber 56 which is similar to the one utilized in the printing apparatus of the afore-mentioned Schaffert Patent No. 2,576,047.
  • the developing chamber is one wherein xerographic toner of the type described in Copley Patent No. 2,659,670, which issued on November 17, 1953, is permitted to cascade onto the photoconductive layer'surface of electrophotoplate 29 and, of course, over the latent electrostatic image thereon.
  • a still further rotation of the xerographic drum will cause the toner image on electrophotoplate 29 to move out of chamber 56 and into the realm of a toner fixing station 57 whereat the toner image powder particles are somewhat solidified and the toner image is caused to ad here to the surface of electrophotoplate 29 for a reason other than the latent electrostatic image.
  • This station 57 is comprised of an electromagnetically controlled spray apparatus having a reservoir with a solvent 65 therein, such as methylene chloride for example.
  • the operation of piston 58 in a manner to be described in detail hereinafter, causes a solvent spray to be ejected from nozzle 59 onto a heated element 61. This heated element is provided in order to actually break up the large solvent particles in the spray into extremely minute condensation type vapor particles.
  • a further rotation of the xerographic drum causes the permanent design image layer on plate 29 to move out of fixing station 57 and into the toner transfer, or printing, station.
  • a transversely shiftable transfer roller 62 is caused to be in an inoperative position during the first machine cycle so as to prevent a print impression operation from taking place.
  • the transfer roller 62 comprises an inner metallic conductive portion 63 and an outer portion 64 of very resilient or yielding material having a high electrical resistance of at least ohms per cubic centimeter as, for example, a layer of soft conducting rubber.
  • Ann 68 on which transfer roller 62 is mounted, is spring biased in a direction so that roller 62 is away from the surface of xerographic drum 23 and print receiving web 66 is normally out of contact with the surface of the xerographic drum 23 and the electrophotoplate 29.
  • control solenoid 67 therefor is energized, to there by move arm 68 about a stud shaft 69 in a direction whereby transfer roller 62 is moved towards the surface of xerographic drum 23 and web 66 is moved into contact with plate 29.
  • the positive potential applied to the roller causes toner particles to migrate from the xerographic drum to the print receiving web.
  • a rotating plush roller 71 is provided. This cleaning roller is positioned within a housing 72 for retaining the toner removed by the clockwise rotating action of the roller upon the plate 29, from the surface of the electrophotoplate.
  • a vacuum cleaner unit (not shown) may also be utilized with housing 72 in order to remove xerographic toner accumulated therein.
  • a continued rotation of the xerographic drum in a clockwise direction will cause the incremental areas of electrophotoplate 29 to be moved past a permanent design image layer wiping station 73.
  • the apparatus at the wiping station will be disabled.
  • the apparatus at Wiping station 73 will be rendered operated due to the energization of magnet '74. This magnet will attract an armature 75 which is pivotally mounted on a shaft 76, so that the three rows of electrophotoplate wiping sponges 77 attached to the upper portion of armature 75, are moved into engagement with the surface of electrophotoplate 29.
  • the camming member '78 which is also attached to the upper portion of armature 75, will act upon a gate 7Q so as to permit some of the liquid toner solvent 81 to flow to each of the sponges 77 via respective connecting tubes 89.
  • the solvent saturated sponges '77 will act upon the permanent design image layer on the surface of electrophotoplate 29 in such a manner so as to wipe the plate surface clean, i.e., to remove the adhering fixed toner design by unfixing the same with solvent 81.
  • the sponges are preferably attached to their holders in a way that they may be readily removed therefrom when replacement of a sponge is necessary.
  • the successive incremental areas of electrophotoplate 29 now having the permanent design image layer of insulating material thereon, are charged electrically as they are moved past ion-producing charging unit 48 (see also Fig. 2).
  • the first record card 10 will be advanced by a picker mechanism to the first set of feed rolls 13-14.
  • the machine timing is such that this record card is moved past optical scanning station 22 at a time whereby the information 27 (see also Fig.
  • toner is pigmented, the same will be readily distinguishable from the background of Web 66 and will provide a readable printed document.
  • Pressure fixing rollers 77 and 78 are utilized to fix those toner images which are transferred to web 66.
  • a sufiicient line contact pressure of 500 pounds per lineal inch of contact, for example, will cause the xerognaphic toner to flow into the fibers of the web material.
  • An oil pad 79 is provided to remove any excess toner which may tend to cling to the upper fixing roller 77.
  • a web 66 is shown in Fig. 1 instead of separate document sheets for the sake of simplicity.
  • the Web may be out after printing, of course, to provide separate documents.
  • Each machine cycle after the second machine cycle will be similar to the second cycle so long as record cards 10 are available in stacker 11 for feeding to hopper 12.
  • a last original document will be printed on web 66. It is after the printing of this last document that the apparatus at plate wiping station 73 is rendered operated and the permanent design image layer on electrophotoplate 29 is removed.
  • the electrical supply lines 92 and 93 are connected to a suitable power source identified by the reference numeral 96.
  • a hold circuit for relay R10 will be completed from line 92 through contacts 94, 97 and Rltta, and relay R19 to the other side of the line.
  • motor 98 Fig. 7
  • electromagnet clutch 81 If it be desired to stop the machine by depressing the stop key whereby normally closed contacts 94 (Fig. ).
  • the heavy duty motor control relay HD will be energized when contacts R10b close, whereby contacts HDa (Fig. 7) and HDb will be closed to place electric motor 98 and electromagnetic clutch 81 across power source 99.
  • Motor 98 is employed to drive the record card feeding mechanism shown in Fig. 1 as well as the xerographic drum mechanism.
  • clutch 101 is used to couple the drive motor 98 to card picker mechanism control cam 25 and is controlled by clutch magnet 102 (see also Fig. 6a), the operation of which will become clear as the description advances.
  • clutch 81 is for coupling the drive motor to the xerographic drum. Both of the clutches latch at 29 (see also Fig. 8) of the machine cycle following the one during which the control magnets therefor are de-energized.
  • cam contacts C1 close to complete a circuit to energize relays RIP and R2P.
  • clutch 101 latches Y up at 29 of a machine cycle, and since the clutch islatched during the first machine cycle because clutch magnet 102 is not energized, cam contacts CFl 'willbe closed when cam contacts C1 make during the first machine cycle. It willbe recalled that the cam for controlling contacts CF1 is rotated only when the clutch 101 is elfective. Thus, during all subsequent machine cycles when record cards 10 are being fed from hopper 11 to stacker 12, the camcontacts CF1 will be separated when cam contacts C1 close, and relay R21 will not be energized.
  • the hold circuit for relay R1 is from line 92 through contacts R and Rla, and relay RlH to the other side of the line.
  • a parallel circuit to contacts R100 includes cam contacts C11 and hopper contacts 82 so that relay R1 will be maintained picked so long as either relay R10 remains energized or there are cards in hopper 11.
  • relay RZH is effective from approximately 54 to 18 of the second machine cycle, via cam contacts C2 (see also Fig. 8) and relay contacts R211. It may be concluded then that relay R1 will be maintained picked once the start key is depressed and as long as there are record cards in hopper 11, whereas relay R2 will re-- main picked for only one cycle following the first machine cycle.
  • spray magnet 103 is energized at approximately 216 from line 92 (Fig. 6a) through cam contacts C3, relay contacts R2b, Rild and R1242, and magnet 103 to line 93.
  • spray magnet 193 is energized and de-energized six separate tirncs until 314.
  • a permanent design image layer is caused to be formed and secured to the surface of electrophotoplate 29.
  • each record card 10 is caused to be scanned by the apparatus in station 22 at a time when the portion of the photoconductive layer 31 corresponding to the region 35 of record 34, is moving past the optical station.
  • Rod 51 (Fig. 1) is acted upon by cam 19 during the second machine cycle, but this is of no consequence because there are no format records in feeding station 36 any longer.
  • the first record card is scanned during the second machine cycle as it is moved through optical station 22, whereby a latent electrostatic image of the information 27 (see also Fig. 3) is impressed on the area of the photoconductive layer 31 corresponding to the format record area 35.
  • the light rays directed to impinge upon the permanent design image layer of insulating material will not discharge the same; however, all of the incremental areas of the photoconductive layer 31 except for the afore-mentioned area corresponding to area 35 will be discharged by the light radiation applied thereto.
  • a continued rotation of the xerographic drum will cause the afore-mentioned charged areas to be developed by the xerographic toner in chamber 56.
  • control magnet 103 (Fig. 6a) will not be energized due to open contacts R212.
  • the transfer magnet 67 will be energized at approximately 270, however, to thereby move the transfer roller 62 (see Figs. 1 and 2) towards xerographic plate 29.
  • the toner defining the original document identified by the reference numeral 34a in Fig. 3 and electrostatically adhering to the permanent design image layer and the photoconductive layer 31 corresponding to region 35a, will be transferred onto the surface of print receiving web 66.
  • the print receiving web movement is controlled by a mechanism (not shown) whereby the web is advanced with electrophotoplate 29 only while the web is in contact therewith.
  • the print receiving web may be subsequently advanced through a document cutting station or a sO-called bursting machine for separating the successive document print impressions into original documents.
  • Nth cycle.It is during this machine cycle that the last record card 10 is fed from hopper 11. A print impression on web 66 is obtained in the same manner as one is elfected during the second machine cycle.
  • normally closed hopper contacts 104 (Fig. 6a) will make as the last rec- 0rd card 10 is moved out of stacker 11.
  • the card lever contact 107 is closed as a result of card lever 106 being acted upon by the card.
  • relay R11 will be energized during the nth machine cycle.
  • a hold for this relay is provided through cam contacts C7 which, as may be seen in Fig.
  • relay R10 Inasmuch as hopper contacts 97 open at the same time that hopper contacts 104 close, the hold circuit for relay R10 is caused to open during the nth machine cycle when cam contacts C6 separate at approximately 355 of the nth cycle. However, since relay R11 is already picked at the time relay R10 is dropped out, the motor control relay HD will remain energized via contacts R110. Furthermore, due to the fact that relay R11 will drop out at approximately 40 of the nth-l-l cycle when cam contacts C7 separate (see also Fig. 8), contacts R12b, are placed in parallel circuit with contacts R101: and R in order to maintain the heavy duty motor relay HD picked so as to provide a sufliciently long runout time.
  • Relay R1 will drop out at 355 when contacts R10c open because contacts 82 will already be open. Thus, the record card feeding mechanism will latch up at 29 of the nth-l-l machine cycle because normally open contacts Rlb will prevent a circuit to clutch magnet 102.
  • the xerographic printer shown in Fig. 1 may quite easily be adapted for use as a systems duplicator; that is, a printing machine whereby a predetermined number of duplicate copies may be made from a single printing plate.
  • a format record 34 to be duplicated must be placed into feeding station 36 and two record cards 10 must be placed in hopper 11.
  • the second or uppermost record card in the hopper is a dummy card and is necessary in order to keep the hopper contacts in an operated status while the xerographic machine is providing a plurality of printed copies of the format record.
  • the first or bottommost record card it) in the hopper will have no printed information thereon but instead simply a digit representing hole in a card control column.
  • the xerographic printer Upon depression of the start key, the xerographic printer will begin operating in the manner previously described, whereupon format record 34 will be moved past exposure station 25 in order to form a latent electrostatic image of the record on photo-conductive layer 31 of electrophotoplate 29.
  • this latent electrostatic image will be developed within chamber 56 and fixed by the mechanism of station 57.
  • the permanent design image layer now formed will be charged by unit 48 and developed within chamber 56 so that a toner image will be available for transfer onto print re DCving web 65.
  • the first or bottommost record card 16 will be advanced by the record card picker mechanisininto the bite of feed rollers 13 and 14.
  • the index hole in the card control column will be read by the apparatus at station 21 and will be entered into an accumulator controlled by add magnet 111 (see Fig. 6a).
  • the storage of a value other than zero in this accumulator will cause the printing machine to prevent the feeding of the second record from hopper 11, and will cause the prrinting of a number of duplicate copies of the format record, to correspond to the information in the card.
  • the first recordcard 10 (Fig. 1) has a 4 digit representing hole punched therein.
  • a 4 digit value will be entered into the accumulator (similar to one shown and described in Lake et a1.
  • Patent No. 2,328,653, which issued on September 7, 1943) controlled by magnet'111 via the circuit from line 92 through cam contacts CB1 and CB2, card lever contacts 112, the apparatus at sensing station 21, the plug wire connecting hubs 113 and.114, contacts Rlob 11/0, and add magnet 111 tothe other side of the line.
  • Relay R16 will be picked at this time inasmuch as R16?
  • Relay R14P will be energized at 279 of the first machine cycle when cam contacts C40 close, and will be maintained picked by the circuit from line 92 through contacts Risa and R14b.
  • Switch 36 is provided to prevent therelay R14? circuit from forming during other machine operations. Itis to be observed that relay R15 may be picked during a machine cycle only if the Wiper arm 116 thereof is in contact with conducting segment and common strip 115.
  • relay R15 cannot be energized during this machine cycle because wiper arm 115 will be in contact with the conducting segment 4 and strip 115. It should be pointed out here that the readout device shown and described in Brand et al. Patent No. 2,502,9l9 which issued on April 4, 1950, may be used with the accumulator. Thus, relay R14 will remain picked and clutch magnet 102 (see also Fig. 6a) will not be energized when cam contacts C make.
  • a circuit may be completed to add magnet 111 via cam contacts CB3 and CB4, and relay contacts R14c and R1617 n/c at 9- index time.
  • This circuit will be effective during the third machine cycle to enter a 9 digit'value into the accumulator. The entry of this'digit will cause wiper arm 1.16 to be moved from the conductingsegment to conducting segment 3. Thus, relay R15. willnot be picked during the third machine cycle.
  • another 9 digit value will be entered into the accumulator via the foregoing circuit and the wiper element will be moved from the conducting segment 3 to the conducting segment 2.
  • a 9 digit entry will cause the wiper arm of the accumulator controlled by magnet 111 to be moved from the conducting segment 1 to the conducting segment 0.
  • relay R15 will be energized through cam contacts C13. This will cause relay R14 to drop out immediately when contacts R15a break, and the circuit including the contacts CB3 and CB4 to open when contacts R14c separate.
  • the circuit to the clutch control magnet 1 32 will be conditioned so that at 20 of the fifth machine cycle, clutch magnet 102 will be energized. Hence the sec- 0nd record card 10 in hopper 11 will be moved out of the hopper, and since this card will have no data punched therein, it will simply be fed into stacker 12.
  • FIG. 5 Another embodiment of this invention is shown in somewhat diagrammatic form in Fig. 5 to include a cathode ray tube 120 which is controlled by character forming and display circuits identified by reference numeral 121.
  • the circuits 121 are controlled, in turn, by a mechanically governed trigger arrangement 122 which is rendered on, for example, at just about the time that optical exposure is to be made.
  • the trigger 122 is rendered off so as to extinguish the cathode ray tube.
  • a cyclically operable electrophotographic printer of the class described comprising an electrophotoplate having a layer of photoconductive insulating material thereon; record information scanning means; means effective during a first cycle of printer operation for forming on said electrophotoplate a design image layer of permanently adhering insulating material, said means including a first record feeding mechanism for moving a format record past said scanning means so that a latent electrostatic image of the information on said format record is produced on the surface of said electrophotoplate, said means further including electric circuit means for controlling the operation of said first record feeding mechanism so that said mechanism is operative to move a format record only during the first cycle of printer operation, means for developing said latent electrostatic image by depositing a finely divided substance on said image so as to render said image visible, means for permanently fixing the substance defining the developed image on the surface of said electrophotoplate; means effective during a second cycle of printer operation for effecting a print operation, said print effecting means including a second feeding mechanism for moving record cards past said scanning means so that a latent electrostatic image
  • a device additionally including means for detecting the operation of said second feeding mechanism whereby record cards are caused to be moved past said scanning means, and control means governed by said detecting means for disabl'ing said transfer means during the cycles of printer operation that record cards are not moved past said scanning means.
  • An electrophotographic printer of the class described comprising an electrophotoplate, ion-producing means caused to be effective a first time to electrostatically charge said electrophotoplate, optical means for exposing said electrophotoplate to a light image so as to form a latent electrostatic image thereon, powder depositing means caused to be effective a first time to dust the surface of said electrophotoplate so as to develop said latent electrostatic image, means for permanently aflixing the developed powder image on the surface of said electrophotoplate in the configuration of said image, said ion-producing means caused to be eifective a second time to electrostatically charge the permanently fixed powder image adhering to the surface of said electrophotoplate, said powder depositing means caused to be eflective a second time to dust said permanently fixed image with a pigmented transferable material, means for transferring said pigmented material onto print receiving material in the configuration of said image, means for moving said electrophotoplate, and printer control means for governing the operation of the aforesaid preceding means so that said preceding means are

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
US477556A 1954-12-24 1954-12-24 Electrophotographic printer Expired - Lifetime US2889758A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US477556A US2889758A (en) 1954-12-24 1954-12-24 Electrophotographic printer
FR1160648D FR1160648A (fr) 1954-12-24 1955-12-13 Dispositif perfectionné d'impression xérographique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1160648XA 1954-12-24 1954-12-24
US477556A US2889758A (en) 1954-12-24 1954-12-24 Electrophotographic printer

Publications (1)

Publication Number Publication Date
US2889758A true US2889758A (en) 1959-06-09

Family

ID=26813866

Family Applications (1)

Application Number Title Priority Date Filing Date
US477556A Expired - Lifetime US2889758A (en) 1954-12-24 1954-12-24 Electrophotographic printer

Country Status (2)

Country Link
US (1) US2889758A (fr)
FR (1) FR1160648A (fr)

Cited By (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037478A (en) * 1957-10-23 1962-06-05 American Photocopy Equip Co Apparatus for developing electrophotographic sheet
US3056136A (en) * 1957-10-31 1962-09-25 Jack E Macgriff Image control device and method of printing
US3058444A (en) * 1959-03-13 1962-10-16 American Photocopy Equip Co Apparatus for developing electrostatic image on electrographic sheet
US3076392A (en) * 1959-08-31 1963-02-05 Xerox Corp Xerographic reproducing apparatus
US3088386A (en) * 1959-11-16 1963-05-07 American Photocopy Equip Co Electrophotographic photocopy machine
US3090287A (en) * 1959-04-03 1963-05-21 Ritzerfeld Wilhelm Xerographic duplicating machine
US3109355A (en) * 1959-04-03 1963-11-05 Ritzerfeld Wilhelm Xerographic duplicator
US3115075A (en) * 1960-02-09 1963-12-24 Gen Dynamics Corp Bright display system
US3117847A (en) * 1961-03-28 1964-01-14 Xerox Corp Xerographic powder image fixing apparatus
US3146100A (en) * 1960-01-26 1964-08-25 Bohn Business Machines Inc Electronic photocopying apparatus and method
US3148601A (en) * 1960-12-23 1964-09-15 Xerox Corp Xerographic reproducing apparatus
US3187651A (en) * 1960-12-23 1965-06-08 Xerox Corp Xerographic reproducing apparatus
US3194157A (en) * 1962-12-19 1965-07-13 Autographic Business Forms Method of printing workpieces
US3194154A (en) * 1961-07-03 1965-07-13 Autographic Business Forms Punch card controlled web feeding and printing apparatus
US3204247A (en) * 1959-12-24 1965-08-31 Burroughs Corp Electrostatic data display
US3281857A (en) * 1962-01-12 1966-10-25 Xerox Corp Xerographic transfer platen
US3386379A (en) * 1962-04-04 1968-06-04 Xerox Corp Duplicating with color producing reagents
DE1522570A1 (de) 1966-10-07 1969-09-18 Canon Camera Co Elektrofotografische Kopiereinrichtung
US3491684A (en) * 1966-07-05 1970-01-27 Fallstaff Office Products Inc Unitary master and copy machine
US3524704A (en) * 1966-10-17 1970-08-18 Xerox Corp Multilength document recording apparatus
US3576367A (en) * 1968-09-06 1971-04-27 Ibm Machine for preparing documents
US3620618A (en) * 1969-10-08 1971-11-16 Xerox Corp Multiple input copying apparatus
US3639059A (en) * 1969-02-10 1972-02-01 Matrographics Inc Graphic-processing apparatus
US3640249A (en) * 1969-10-29 1972-02-08 Xerox Corp Transfer apparatus
US3642370A (en) * 1967-06-30 1972-02-15 William Henry Palmer Meredith Document presentation device
US3648603A (en) * 1970-02-27 1972-03-14 Olivetti & Co Spa Machine for copying an original making a master from the original, and printing from the master
US3649115A (en) * 1969-09-26 1972-03-14 Eastman Kodak Co Pick off means for an electrostatic reproduction device
US3661453A (en) * 1970-06-22 1972-05-09 Xerox Corp Electrostatic label printer
US3679300A (en) * 1970-06-22 1972-07-25 Xerox Corp Label printing apparatus
DE1797558A1 (de) * 1966-10-10 1972-09-21 Canon Kk Reinigungseinrichtung fuer eine elektrofotografische Kopiereinrichtung
US3711796A (en) * 1970-03-30 1973-01-16 Canon Kk Electrophotographic copying machine
US3728018A (en) * 1969-11-14 1973-04-17 Xerox Corp Imaging apparatus
US3746442A (en) * 1971-11-23 1973-07-17 Xerox Corp Electrophotographic imaging apparatus
US3759220A (en) * 1970-11-04 1973-09-18 Canon Kk Cleaning device in electrophotography
US3770429A (en) * 1970-09-25 1973-11-06 Katsuragawa Denki Kk Method for removing corona discharge contaminants in electrophotography
JPS4990946A (fr) * 1972-12-11 1974-08-30
US3849171A (en) * 1969-12-02 1974-11-19 Rank Xerox Ltd Method for cleaning background areas from developed recording surfaces
US3867170A (en) * 1969-12-19 1975-02-18 Xerox Corp Method for cleaning liquid developers
US3879123A (en) * 1973-01-26 1975-04-22 Powell B J Copy machine
USRE28568E (en) * 1970-03-30 1975-10-14 Electrophotographic copying machine
US3924566A (en) * 1974-11-25 1975-12-09 Xerox Corp Reproduction machine with means for solidifying the reclaim toner
US3947108A (en) * 1974-05-20 1976-03-30 Xerox Corporation Cleaning system
US3950168A (en) * 1973-02-26 1976-04-13 Xerox Corporation Fixing powder images
US3981269A (en) * 1974-03-20 1976-09-21 Fuji Xerox Co., Ltd. Fixing device for electrophotographic duplicating machines
US4007983A (en) * 1975-10-29 1977-02-15 Xerox Corporation Liquid developer cleaning means
USRE29632E (en) * 1965-10-11 1978-05-16 Canon Kabushiki Kaisha Electrophotographic device
US4106868A (en) * 1975-11-05 1978-08-15 Oce-Van Der Grinten N.V. Electrographic copying apparatus with surface-to-surface image transfers
US4120580A (en) * 1976-06-30 1978-10-17 Xerox Corporation Collating system for slide reproduction
US4139653A (en) * 1973-01-10 1979-02-13 Agfa-Gevaert N.V. Method for the development of electrostatic charge patterns
JPS553699B1 (fr) * 1977-09-02 1980-01-26
US4190464A (en) * 1971-06-03 1980-02-26 Canon Kabushiki Kaisha Method for cleaning a photoconductive surface with liquid toner
JPS5511000Y1 (fr) * 1978-09-14 1980-03-10
US4296423A (en) * 1978-08-18 1981-10-20 Konishiroku Photo Industry Co., Ltd. Device for adjusting image density in composite information recording apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2357809A (en) * 1940-11-16 1944-09-12 Chester F Carlson Electrophotographic apparatus
US2624652A (en) * 1944-10-11 1953-01-06 Chester F Carlson Graphic recording
US2703280A (en) * 1950-05-17 1955-03-01 Western Electric Co Counting circuit control for electrophotographic printers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2357809A (en) * 1940-11-16 1944-09-12 Chester F Carlson Electrophotographic apparatus
US2624652A (en) * 1944-10-11 1953-01-06 Chester F Carlson Graphic recording
US2703280A (en) * 1950-05-17 1955-03-01 Western Electric Co Counting circuit control for electrophotographic printers

Cited By (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037478A (en) * 1957-10-23 1962-06-05 American Photocopy Equip Co Apparatus for developing electrophotographic sheet
US3056136A (en) * 1957-10-31 1962-09-25 Jack E Macgriff Image control device and method of printing
US3058444A (en) * 1959-03-13 1962-10-16 American Photocopy Equip Co Apparatus for developing electrostatic image on electrographic sheet
US3090287A (en) * 1959-04-03 1963-05-21 Ritzerfeld Wilhelm Xerographic duplicating machine
US3109355A (en) * 1959-04-03 1963-11-05 Ritzerfeld Wilhelm Xerographic duplicator
US3076392A (en) * 1959-08-31 1963-02-05 Xerox Corp Xerographic reproducing apparatus
US3088386A (en) * 1959-11-16 1963-05-07 American Photocopy Equip Co Electrophotographic photocopy machine
US3204247A (en) * 1959-12-24 1965-08-31 Burroughs Corp Electrostatic data display
US3146100A (en) * 1960-01-26 1964-08-25 Bohn Business Machines Inc Electronic photocopying apparatus and method
US3115075A (en) * 1960-02-09 1963-12-24 Gen Dynamics Corp Bright display system
US3187651A (en) * 1960-12-23 1965-06-08 Xerox Corp Xerographic reproducing apparatus
US3148601A (en) * 1960-12-23 1964-09-15 Xerox Corp Xerographic reproducing apparatus
US3117847A (en) * 1961-03-28 1964-01-14 Xerox Corp Xerographic powder image fixing apparatus
US3194154A (en) * 1961-07-03 1965-07-13 Autographic Business Forms Punch card controlled web feeding and printing apparatus
US3281857A (en) * 1962-01-12 1966-10-25 Xerox Corp Xerographic transfer platen
US3386379A (en) * 1962-04-04 1968-06-04 Xerox Corp Duplicating with color producing reagents
US3194157A (en) * 1962-12-19 1965-07-13 Autographic Business Forms Method of printing workpieces
USRE29632E (en) * 1965-10-11 1978-05-16 Canon Kabushiki Kaisha Electrophotographic device
US3491684A (en) * 1966-07-05 1970-01-27 Fallstaff Office Products Inc Unitary master and copy machine
DE1522570A1 (de) 1966-10-07 1969-09-18 Canon Camera Co Elektrofotografische Kopiereinrichtung
DE1797558A1 (de) * 1966-10-10 1972-09-21 Canon Kk Reinigungseinrichtung fuer eine elektrofotografische Kopiereinrichtung
US3524704A (en) * 1966-10-17 1970-08-18 Xerox Corp Multilength document recording apparatus
US3642370A (en) * 1967-06-30 1972-02-15 William Henry Palmer Meredith Document presentation device
US3576367A (en) * 1968-09-06 1971-04-27 Ibm Machine for preparing documents
US3639059A (en) * 1969-02-10 1972-02-01 Matrographics Inc Graphic-processing apparatus
US3649115A (en) * 1969-09-26 1972-03-14 Eastman Kodak Co Pick off means for an electrostatic reproduction device
US3620618A (en) * 1969-10-08 1971-11-16 Xerox Corp Multiple input copying apparatus
US3640249A (en) * 1969-10-29 1972-02-08 Xerox Corp Transfer apparatus
US3728018A (en) * 1969-11-14 1973-04-17 Xerox Corp Imaging apparatus
US3849171A (en) * 1969-12-02 1974-11-19 Rank Xerox Ltd Method for cleaning background areas from developed recording surfaces
US3867170A (en) * 1969-12-19 1975-02-18 Xerox Corp Method for cleaning liquid developers
US3648603A (en) * 1970-02-27 1972-03-14 Olivetti & Co Spa Machine for copying an original making a master from the original, and printing from the master
US3711796A (en) * 1970-03-30 1973-01-16 Canon Kk Electrophotographic copying machine
USRE28568E (en) * 1970-03-30 1975-10-14 Electrophotographic copying machine
US3661453A (en) * 1970-06-22 1972-05-09 Xerox Corp Electrostatic label printer
US3679300A (en) * 1970-06-22 1972-07-25 Xerox Corp Label printing apparatus
US3770429A (en) * 1970-09-25 1973-11-06 Katsuragawa Denki Kk Method for removing corona discharge contaminants in electrophotography
US3759220A (en) * 1970-11-04 1973-09-18 Canon Kk Cleaning device in electrophotography
US4190464A (en) * 1971-06-03 1980-02-26 Canon Kabushiki Kaisha Method for cleaning a photoconductive surface with liquid toner
US3746442A (en) * 1971-11-23 1973-07-17 Xerox Corp Electrophotographic imaging apparatus
JPS4990946A (fr) * 1972-12-11 1974-08-30
US4139653A (en) * 1973-01-10 1979-02-13 Agfa-Gevaert N.V. Method for the development of electrostatic charge patterns
US3879123A (en) * 1973-01-26 1975-04-22 Powell B J Copy machine
US3950168A (en) * 1973-02-26 1976-04-13 Xerox Corporation Fixing powder images
US3981269A (en) * 1974-03-20 1976-09-21 Fuji Xerox Co., Ltd. Fixing device for electrophotographic duplicating machines
US3947108A (en) * 1974-05-20 1976-03-30 Xerox Corporation Cleaning system
US3924566A (en) * 1974-11-25 1975-12-09 Xerox Corp Reproduction machine with means for solidifying the reclaim toner
US4007983A (en) * 1975-10-29 1977-02-15 Xerox Corporation Liquid developer cleaning means
US4106868A (en) * 1975-11-05 1978-08-15 Oce-Van Der Grinten N.V. Electrographic copying apparatus with surface-to-surface image transfers
US4120580A (en) * 1976-06-30 1978-10-17 Xerox Corporation Collating system for slide reproduction
JPS553699B1 (fr) * 1977-09-02 1980-01-26
US4296423A (en) * 1978-08-18 1981-10-20 Konishiroku Photo Industry Co., Ltd. Device for adjusting image density in composite information recording apparatus
JPS5511000Y1 (fr) * 1978-09-14 1980-03-10

Also Published As

Publication number Publication date
FR1160648A (fr) 1958-07-22

Similar Documents

Publication Publication Date Title
US2889758A (en) Electrophotographic printer
US2859673A (en) Electrophotographic printer
US2909971A (en) Printing machine
US2857290A (en) Electroferrographic printing process and apparatus therefor
US3045587A (en) Electrostatic printing apparatus for forming multiple copies
US2741960A (en) Record controlled printer
US2959153A (en) Xerographic image developing apparatus
US2885955A (en) Xerographic machine
US3045644A (en) Two-color electrostatic printing apparatus
JPS58130369A (ja) 電子写真複写機
US4348098A (en) Electrophotographic apparatus
US3728016A (en) Cleaning apparatus for electrostatic copy devices
US2944147A (en) Xerographic printer
US3257222A (en) Electrostatic recording method and apparatus using shaped electrodes
US3043685A (en) Xerographic and magnetic image recording and reproducing
US3160091A (en) High speed xeroprinter and method therefor
US3099856A (en) Web cleaner apparatus
US3526191A (en) Duplicating process employing magnetic developer material
US3690760A (en) Electrostatic printing system
GB734909A (en) Electrostatic recording of images of characters
US2987037A (en) Xerographic printer
GB1363358A (en) Xerographic copying machine
US2932690A (en) Apparatus for image reproduction
US2884704A (en) Apparatus for fixing electrographic printer images
US3132963A (en) Xerothermography