EP1179754B1 - Prozessisolationsprogramm für einen elektrophotographischen Markierungsapparat - Google Patents

Prozessisolationsprogramm für einen elektrophotographischen Markierungsapparat Download PDF

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Publication number
EP1179754B1
EP1179754B1 EP01110023.7A EP01110023A EP1179754B1 EP 1179754 B1 EP1179754 B1 EP 1179754B1 EP 01110023 A EP01110023 A EP 01110023A EP 1179754 B1 EP1179754 B1 EP 1179754B1
Authority
EP
European Patent Office
Prior art keywords
electrophotographic
logic
electrophotographic process
control unit
image
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
EP01110023.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1179754A3 (de
EP1179754A2 (de
Inventor
Matthias H. Regelsberger
David E. Hockey
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
Publication of EP1179754A2 publication Critical patent/EP1179754A2/de
Publication of EP1179754A3 publication Critical patent/EP1179754A3/de
Application granted granted Critical
Publication of EP1179754B1 publication Critical patent/EP1179754B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5012—Priority interrupt; Job recovery, e.g. after jamming or malfunction
    • 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
    • G03G15/55—Self-diagnostics; Malfunction or lifetime display
    • 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
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00033—Image density detection on recording member
    • G03G2215/00037—Toner image detection
    • G03G2215/00042—Optical detection
    • 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
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00033—Image density detection on recording member
    • G03G2215/00054—Electrostatic image detection

Definitions

  • the present invention relates to the maintenance and operation diagnosis of an electrophotographic marking apparatus, in particular, the selective interruption of an electrophotographic marking operation during the normal printing operation and a subsequent readjustment to the normal printing operation.
  • Electrophotographic markers such as copiers and printers require various forms of maintenance, such as e.g. Filling the toner and paper to keep the copy functions you want ready.
  • maintenance such as e.g. Filling the toner and paper to keep the copy functions you want ready.
  • the performance of the operator interface must be broadened to make the troubleshooting in the apparatus complete and effective.
  • Diagnostic procedures often require service personnel to analyze the problem. Problems with paper transport in an apparatus can occur at various locations and due to various conditions or disturbances of various parts in the apparatus.
  • One difficulty with previous diagnostic services is that it is not possible to easily and automatically accurately determine the parts or subordinate systems that are causing the device to malfunction.
  • the US 5 721 621 A shows a printer, which provides for a sweeping movement of a printhead, in particular an inkjet printhead, a line by line printing of a recording medium.
  • a printer which provides for a sweeping movement of a printhead, in particular an inkjet printhead, a line by line printing of a recording medium.
  • an emergency stop and a temporary stop are provided, which differ in that the emergency stop can interrupt a printing process at any time (for example, in the middle of a print line), while the temporary stop only one interruption at the end (ie after Completion) of a print line.
  • an electrophotographic marking apparatus which can be selectively controlled to provide analysis and examination of the steps of image formation prior to completion of the electrophotographic process. Further, there is a need for interrupting the electrophotographic process at predetermined steps, wherein a reconfiguration process is provided to return the apparatus to normal printing operation.
  • an electrophotographic marking apparatus according to claim 1 and a maintenance and diagnostic method according to claim 7 is provided. Further embodiments emerge from the subclaims.
  • the present invention relates to an electrophotographic process controller which controls the various steps of image formation and paper handling isolated from each other. So may be the reason for defects in the image during imaging arise (eg smearing, insufficient coverage, cloudy pressure), and problems in handling the paper in the transport system (eg, kinked corners, damage at the edges) are correctly identified and efficiently remedied.
  • the present invention also enables isolation of the steps on the paper path from insertion to finishing.
  • the invention includes an electrophotographic marking apparatus having a logic and control unit configured to stop the printing operation at a predetermined point before the completion of the printing operation without causing a hard stop or emergency stop configuration.
  • the predetermined point may correspond to any copy of multiple copies, a time, or a location on the paper path.
  • the logic and control unit is selected to provide a regeneration sequence which returns the marker to the normal print mode.
  • FIG. 1 An electrographic marking apparatus 10 is shown.
  • the present invention will be described with reference to a particular electrographic marking apparatus such as a copier or printer. However, it should be noted that although the invention is suitable for use in such apparatus, it can also be used with other types of electrophotographic copiers and printers.
  • the electrophotographic marking apparatus 10 includes a paper path ranging from the paper feed to the finishing.
  • the term paper also refers to sheets, paper webs, transparent carrier elements, composite carrier elements or those of laminates.
  • the electrophotographic marking apparatus 10 shown includes a movable image bearing member, such as a photoconductive belt 18, stretched about a plurality of rollers, one of which is driven by a motor to guide the belt past a series of processing stations of the printer.
  • the image bearing member may also be configured as a drum.
  • the logic and control unit (LCU) 24 which may include a digital computer, allocates a stored program successive actuation of the various processing stations or subordinate systems of the apparatus 10.
  • a charging station sensitizes the belt 18 by applying a uniform electrostatic charge of predetermined primary voltage V 0 to the surface of the belt.
  • the power of the first charging station is regulated by a programmable controlled power supply 30, which in turn is controlled by the LCU 24 to adjust the primary voltage V 0, for example by controlling the electrical potential (V Grid ) on a grid electrode 28b, which detects the movement of the charged ions which is caused by the operation of the charging gold wires 28a controls on the surface of the support member.
  • a negative electrical bias is applied to the grid electrodes 28b, eg between -350 and -750 volts; a desired bias voltage can be -500 volts.
  • the projected light from a write head 34 modulates the electrical charge on the photoconductive belt 18 to produce a latent electrostatic image of a document to be copied or printed.
  • the write head preferably comprises a series of light emitting diodes (LEDs) or other light source, such as a light source. a laser or other exposure source for exposing the photoconductive belt.
  • the exposure is pixel by pixel with a regulated intensity in accordance with the signals from the LCU to the write head interface 32, the write head interface comprising a programmable controller.
  • the exposure may be achieved by an optical projection of an image of a document onto the photoconductive element.
  • the image data to be recorded is provided by a data source 36 for generating electrical image signals, eg from a computer, a document scanner, a memory or a data network. Signals from the data source and / or LCU may also output control signals to a recorder network and so on.
  • a data source 36 for generating electrical image signals, eg from a computer, a document scanner, a memory or a data network. Signals from the data source and / or LCU may also output control signals to a recorder network and so on.
  • the movement of the belt 18 in the direction of the arrow A passes the areas carrying the latent electrostatographic charge images past a developer station 38.
  • the toner or developer unit has one or more magnetic brushes (several in different colors) adjacent to, but spaced from, the tape.
  • Magnetic brush developer units are known from US 4,473,029 and 4,546,060 known.
  • the LCU 24 selectively actuates the developer unit in relation to the passing image areas carrying the latent images.
  • the magnetic brush is selectively brought into contact with or at a small distance from the belt 18.
  • the charged toner particles of the contacted magnetic brush are attracted to the latent image pattern as an image to develop the pattern.
  • the calibration marks used for process control are being developed.
  • the conductive parts of the developer unit act as electrodes.
  • the electrodes are connected to a variable supply of DC potential V B which is regulated by a programmable controller 40.
  • V B DC potential
  • the details regarding the developer units are set forth by way of example, but are not essential to the invention.
  • the development corresponds to a DAD (Discharge Area Development) process in which negatively charged toner particles selectively develop into relatively discharged areas of the light guide.
  • DAD Charge Area Development
  • Other types of developer units are known and can be used as well.
  • a transfer unit 46 is provided in order to bring a receiving sheet S in registration with the image into contact with the light-guiding element.
  • the image is transferred to a recording sheet, for example made of paper, or a plastic sheet.
  • the transmission unit comprises a transmission corona charger 47.
  • the electrostatic transfer of the toner image is performed with a suitable voltage applied to the transfer charger 47 to generate a constant current, as described below.
  • the back surface of the receiver sheet is positively charged by the transfer charger in this example while the receiver sheet contacts the toner image on the photoconductor member to draw the toner image onto the receiver sheet.
  • the receiving sheet may be released from the belt 18 by means of a known non-stick corona charger (not shown).
  • a cleaning brush 48 or knife is also provided downstream of the transfer unit to remove the toner from the belt 18 to allow reuse of the surface to form additional images.
  • a charger 43 is usually provided to neutralize positive charge on the light guide or to reduce electrostatic adhesion of the remaining particles on the belt 18 in this case.
  • the voltage of the cleaning and treatment charger is controlled by a power supply 42. While separate power supplies are shown for each charger, multiple power supply power may be used instead of multiple power supplies.
  • the receiver sheet After transferring the unfixed toner images onto a receiver sheet, the receiver sheet is conveyed to a fusing unit 49, where the image is fixed.
  • a densitometer 76 is disposed between the developer unit 38 and the transfer unit 46.
  • the densitometer 76 monitors the development of the regions of the photoconductive belt 18 as known in the art.
  • a second sensor which is also preferably provided for process control, is an electrostatic voltmeter 50.
  • a voltmeter is preferably the first one Charging station 28 located downstream to provide readings of measured V 0 s or V 0 (m) s available.
  • the output V 0 ( m ) s and densities determined by the densitometer 76 are applied to the LCU 24, which generates new setpoints for Eo, V 0 and the toner replenishment operation in accordance with a process control program.
  • the LCU 24 provides overall control of the device and its various subordinate systems.
  • the programming of commercially available microprocessors is familiar to the person skilled in the art. The following disclosure is intended to enable a programmer to write a suitable control program for such a microprocessor.
  • logic operations described in this document may also be provided by or in cooperation with non-programmable (hardware) or programmable logic devices.
  • encoders are commonly used in conjunction with indicators on the photoconductive element to promptly output signals indicative of the image frame areas and their position relative to the various units. Other types of timing control may also be used.
  • Fig. 2 12 shows a block diagram of a typical LCU 24.
  • the typical LCU 24 includes a temporary data store, the central processing unit 154, the timing and cycle control unit 156, the process isolation program 155, and the stored program controller 158.
  • the data input and output is sequential on or off-line the program control.
  • Input data is fed either through the input signal buffer 160 into an input data processor 162 or through an interrupt signal processor 164.
  • the input signals are derived from various switches, sensors and analog-to-digital converters which are parts of the apparatus 10 or from external sources to be passed on to him.
  • the output data and control signals are fed directly or through a latch 166 into appropriate output drivers 168.
  • the output drivers are connected to the appropriate subordinate systems.
  • the LCU 24 includes the "stop and regeneration” or “process isolation” routines for stopping the electrophotographic process and re-setting the apparatus 10 to the normal printing configuration.
  • the LCU 24 enables the isolation of the sequential image formation steps so that the respective steps can be examined individually.
  • the LCU optionally stops the electrophotographic process under control of the LCU at arbitrary points among a plurality of predetermined points. If the electrophotographic process is stopped at one of these predetermined points, an on-site engineer may examine the resulting product and machine configuration at the predetermined point to identify malfunctions of a particular subordinate system or image irregularities.
  • a hard stop is a complete stop of the apparatus. With a hard stop, the operator usually has to intervene and perform some regeneration steps. A hard stop usually involves an inevitable complete reconfiguration of the system before another step of the electrophotographic process can occur. In contrast, the points stopped in the process isolation program allow various parts of the apparatus to continue working. In addition, the subsequent regeneration process requirements of the apparatus 10 may be substantially reduced under controlled stoppage.
  • the process isolation program enables the usual electrophotographic marking process to a predetermined point at which the marking process is terminated by a command from the LCU 24. This is not with the hard stops or the emergency stops that are due to a change in the apparatus, such as the opening of a door or a paper jam, are brought to equate.
  • the LCU 24 determines the stopping of the marking process, there is no forced hard stop or emergency stop of the relevant subordinate systems.
  • the LCU 24 resets the apparatus 10 to normal printing, initiates subsequent printing, and terminates subsequent printing at a predetermined location subsequent to the first termination.
  • the process isolation program enables examination of the marking process product at a plurality of steps during the marking process.
  • the process isolation program may be configured to initiate an automatic investigation on a number of consecutive steps.
  • the stops may be preprogrammed in the LCU 24 so that they are only selected by an engineer on site.
  • the present invention enables programming of a stop at any given point in the electrophotographic process.
  • a specific sheet number can be programmed in a print job by an engineer on site.
  • the selected sheet of the print job may be paused at any point prior to register placement to allow examination of the paper path prior to image transfer.
  • a programmable stop for sheets may be provided except for the first few sheets, enabling examination of the duplex paper path before or after the second transfer.
  • the predetermined stop of the electrophotographic process is programmable for any sheet of the print job, it is possible to examine the paper path until final treatment by selecting a print job of appropriate length in connection with the selection of the sheet to be stopped.
  • the electrophotographic process in the printing operation includes the entire paper path, including the finishing steps.
  • the stop initiated by the LCU 24 is based on the LCU 24 rather than being responsive to an incident in the apparatus, such as e.g. opening a door, removing a tray or a user-entered stop command.
  • the regeneration process cooperates with the predetermined stop point and can reestablish the apparatus to a normal process status or process sequence for subsequent on-site engineer stop.
  • LCU Logic and Control Unit
  • first charging station 28a Aufladepoldrähte 28b grid electrodes 30 power supply 32 interface
  • Data Source 38 developer unit 40 programmable controller 42 power supply 43 loader 46 transmission unit 47 corona charger 48 brush 49 Einschmelzü 50 voltmeter 51 power supply 76 densitometer 154 central processing unit 155 Process isolation program 156 Timing and cycle control unit 158 stored program control 160 Input signal buffers 162 Input data processor 164 Interrupt signal processor 166 latch 168 output driver

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Control Of Electric Motors In General (AREA)
EP01110023.7A 2000-05-17 2001-04-26 Prozessisolationsprogramm für einen elektrophotographischen Markierungsapparat Expired - Lifetime EP1179754B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/572,521 US6442358B1 (en) 2000-05-17 2000-05-17 Electrophotographic marking machine including a controller for the selective interruption and restart of a print mode operation and method
US572521 2000-05-17

Publications (3)

Publication Number Publication Date
EP1179754A2 EP1179754A2 (de) 2002-02-13
EP1179754A3 EP1179754A3 (de) 2004-03-03
EP1179754B1 true EP1179754B1 (de) 2014-02-12

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EP01110023.7A Expired - Lifetime EP1179754B1 (de) 2000-05-17 2001-04-26 Prozessisolationsprogramm für einen elektrophotographischen Markierungsapparat

Country Status (7)

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US (1) US6442358B1 (ja)
EP (1) EP1179754B1 (ja)
JP (1) JP4694084B2 (ja)
AU (1) AU6151701A (ja)
CA (1) CA2375264C (ja)
DE (1) DE10120949A1 (ja)
WO (1) WO2001088616A2 (ja)

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Also Published As

Publication number Publication date
US6442358B1 (en) 2002-08-27
DE10120949A1 (de) 2001-12-13
WO2001088616A2 (en) 2001-11-22
EP1179754A3 (de) 2004-03-03
JP2003533739A (ja) 2003-11-11
CA2375264A1 (en) 2001-11-22
JP4694084B2 (ja) 2011-06-01
AU6151701A (en) 2001-11-26
EP1179754A2 (de) 2002-02-13
CA2375264C (en) 2005-04-26
WO2001088616A3 (en) 2002-07-04

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