EP1047980B1 - Dispositif et procede d'impression ou de photocopie, une marque de toner etant detectee au niveau d'au moins deux points de mesure - Google Patents

Dispositif et procede d'impression ou de photocopie, une marque de toner etant detectee au niveau d'au moins deux points de mesure Download PDF

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Publication number
EP1047980B1
EP1047980B1 EP99904782A EP99904782A EP1047980B1 EP 1047980 B1 EP1047980 B1 EP 1047980B1 EP 99904782 A EP99904782 A EP 99904782A EP 99904782 A EP99904782 A EP 99904782A EP 1047980 B1 EP1047980 B1 EP 1047980B1
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EP
European Patent Office
Prior art keywords
toner
mark
flt
carrier
sensor
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
EP99904782A
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German (de)
English (en)
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EP1047980A1 (fr
Inventor
Joseph Knott
André SCHWARZKOPF
Peter Bremmer
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.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Oce Printing Systems GmbH and Co KG
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Publication of EP1047980A1 publication Critical patent/EP1047980A1/fr
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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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
    • 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
    • G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
    • 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

Definitions

  • the invention relates to a device for printing or copying, wherein at least one toner mark on a toner carrier to check and adjust the toner area coverage is colored with toner.
  • the invention further relates to a Process for printing or copying.
  • a conventional printer or copier has a toner carrier for example a photoconductor; on which a latent Image, for example by exposure, is generated.
  • a Developer station is also used to color the latent image Toner.
  • This developer station contains a developer mixture from toner and carrier, for example magnetic iron particles, with an adjustable amount of toner.
  • To cover the toner area to be able to check and adjust is on the toner carrier a toner mark colored with toner and scanned this toner mark, for example with the help of a Reflex sensor.
  • the factors c to f are relative for a certain device type constant device parameters.
  • the factors a and b are interdependent; the toner supply in the developer zone depends on the Toner concentration, so that the degree of coloration of the latent Image is determined by the toner concentration. This degree of coloring or the toner area coverage is proportional for toner concentration.
  • the setting is made for previous printers or copiers the toner area coverage by measuring the toner mark, for example with the help of a reflex sensor.
  • the signal of the The reflex sensor then serves as a measure of the area coverage, i.e. the darker the coloring of the toner mark with toner, the more the signal level of the voltage of the receiver is lower, which the reflected radiation is detected.
  • This signal level is but also the reflection behavior of the toner and the surface the toner carrier, e.g. depends on the photoconductor surface.
  • the tolerances of the reflex sensor that the Toner mark scans to be noted. Therefore it is state of the art Technology, an individual setting for each printer the toner material, the developer station, the toner carrier etc. to make.
  • a toner density sensor has two toner marks a photoconductor drum.
  • the sensor contains two photo receivers, which is the reflectance of the two toner marks evaluate.
  • the toner marks are transverse to the direction of movement arranged the photoconductor drum, the one toner mark a high toner density and the other toner brand a low one Has toner density.
  • a bias for the developer unit is set.
  • From US-A-5,410,388 is a device or a method known for electrographic printing or copying, at a densitometer at two successive measuring locations an elongated toner mark the respective area coverage determined using infrared radiation. If between the Coverage in the front area of the toner mark and the there is a difference at the rear of the toner mark manifests itself in a different degree of reflection, so parameters of the developer process are simulated, for example, the toner concentration can be changed. Is the difference in reflectivity or the difference in the values of the area coverage equal to zero, so the development process leave unchanged.
  • the invention uses an effect that in the coloring of a full area in the direction of movement of the toner carrier.
  • Two component developer mixes occur.
  • the toner supply is initially large, which leads to a high area coverage. If this first toner supply is transferred to the toner carrier, new toner must first be conveyed through the developer rollers be what at low toner levels too leads to a decrease in area coverage. After the initial The drop in toner supply will then be along the length of the toner mark seen the toner supply remain constant and so also set a constant fan coverage.
  • the colored toner mark is in the direction of movement of the toner carrier seen on at least two successive measured values by at least one sensor scanned and the respective area coverage at these measuring locations mapped as electrical signals.
  • the proportion of toner in the developer mixture set. So it won't be the absolute level of the signal of the sensor, but along the toner mark measured difference in the signals or the quotient of the Signals. This difference or the quotient is extensive regardless of the reflectivity of the toner used, so that no different for different types of toner Settings must be made.
  • the reflectivity the surface of the toner carrier for example the Surface of a photoconductor drum or that of a carrier material from paper on which the toner mark is printed and then is scanned, has little impact on the result, especially then, as explained in more detail below, a measurement of the reflection behavior of the respective Surface is made.
  • An embodiment is characterized in that the Difference or the quotient of the signals at the two Measuring locations is compared with a target value, and that a controller controls a conveyor depending on the comparison, which feeds toner to the developer station.
  • a control system is created which ensures that the printer is always in an optimal operating condition high quality printing result is kept.
  • the control process for a certain undertone, i.e. the Difference is greater than zero or the quotient is not equal One, inserts, is through the subsequent control process ensures that an operating condition with over-toning not set because of a certain control deviation from the setpoint remains.
  • a timing controller is preferably used as the controller used the conveyor between an OFF state and switches an ON state back and forth.
  • the invention is of a fixed Scanning sensor, which is preferably the same sensor that the Scans the toner mark at the two measuring locations, the reference time found a reference point on the toner mark past the scanning sensor.
  • a reference point preferably the leading edge or the trailing edge of the toner mark used.
  • Scanning these locations then takes place for each toner mark with respect to the reference point in defined distances to this reference point.
  • the part of the invention described is preferably used if the evaluation of the electrical signals according to the previously described facility and the process takes place. He can however, can also be used to advantage to the location of a toner mark to be scanned at two measuring locations.
  • Fig. 1 shows a rectangular toner mark 10, the longitudinal extent in the direction of movement of a photoconductor drum lies.
  • the toner mark 10 provided with toner becomes two Measuring locations a1, a2 scanned. Due to the longitudinal movement of the Photoconductor drum results from a circular beam spot an areal extension of the measuring locations a1, a2 Kind of an elongated hole.
  • the measurement location a1 lies approximately in the middle of the first third and the measurement location a2 lies approximately in the middle the last third of the toner mark 10.
  • Figure 1 on the right is a diagram of the course of the voltage U of a radiation receiver over the length L of the toner mark 10 shown.
  • the radiation receiver (not shown) detects that of the toner mark 10 and the surface the photoconductor drum (also not shown) reflected Radiation and converts this if necessary after amplification into a voltage U um.
  • a first section 12 of the curve is radiation from the reflex sensor from the bare photoconductor surface with high reflectivity reflected, and there is a maximum voltage level Um, which is used as the reference level.
  • the Radiation sensor the front edge 10a of the toner mark 10, wherein the reflected radiation and thus also the voltage U decrease.
  • section 14 there is a minimum of the voltage curve, when the beam spot passes the leading edge 10a lies completely within the toner mark 10.
  • section 16 which by detection of the measurement location a1 is marked.
  • the course of tension increases slightly in this area. The reason for that will be explained below.
  • the measurement spot detects the Trailing edge 10b.
  • the voltage U rises again until in section 24 it again reaches the maximum value Um Has. According to the invention is shown in the figure Difference value ⁇ U evaluated.
  • the middle ones Voltage values U in the measuring locations a1 and a2 are taken into account.
  • FIG. 2 a diagram shows that the toner supply TA over the length of a full area, such as the toner mark 10, in the counter-development principle decreases.
  • Photo conductor drum FLT and developer roller EW in opposite directions Direction of rotation, as shown schematically in Figure 2 below is.
  • Developer roller EW reached, so there are many at first Toner particles for transfer to the FLT photoconductor drum ready, so there is a high toner supply TA.
  • After delivery of the first toner particles depletes the toner supply TA, and only as many toner particles are transferred as conveyed through the developer station to the developer roller EW become.
  • the drop in the toner supply TA is around in the initial range the steeper the lower the toner concentration TK.
  • Corresponding the difference in reflection behavior is also greater at the two measuring locations a1 and a2 and accordingly consequently the differential voltage ⁇ U is also greater.
  • Figure 3 shows a similar characteristic field as Figure 2, however for a synchronous development principle in which the directions of rotation of FLT photoconductor drum and EW developer roller are in the same direction. Because of the same directional rotation there is an increased at the rear edge 10b of the toner mark 10 Toner supply, since the developer roller EW with higher Speed as the FLT photoconductor drum rotates. Also here the measuring locations a1, a2 are once in the straight line part of the characteristic curve and once in the relatively steeply falling characteristic part to arrange.
  • Figure 4 relates to the characteristics of the toner supply TA over the Length of the toner mark 10 in the case of a co-reverse development principle, in which two developer rollers EW to each other be moved in opposite directions. There is a falling Characteristic curve of the toner supply TA near the front edge 10a and the rear edge 10b. In the sloping area this The measuring spot a1 or a1 'is to be arranged in a straight line Area of measurement location a2.
  • Figure 5 shows the relationship between area coverage FD a full area, such as a toner mark 10, and the toner supply TA in the developer zone.
  • the area coverage FD is low. This Coverage increases up to 100% when the toner supply increases. An area coverage of 100% means that the toner mark 10 is completely covered with toner and no defect is present, which shows through the surface of the photoconductor drum allows. If with an area coverage of Accordingly, 100% more toner layers are built up the blackening in printing does not increase any further.
  • FIG. 6 shows the arrangement of the measuring locations a1 and a2 in the counter-development principle.
  • a measuring location a1 in Area of the falling characteristic curve can be arranged during the other measurement location a2 in the rectilinear area of the characteristic to be ordered.
  • the characteristic curve 30 also shows intersection points Characteristic curves of different toner concentration TK, their the corresponding lengths L define the measuring locations for a2. For practical For reasons, the measurement location a2 becomes to the right of curve 30 at relatively large length L set.
  • FIG. 7 shows the relationship using a practical example between toner offer TA and area coverage FD uber the length L at different toner concentrations TK, where the lowest characteristic 34 is a low toner concentration Has.
  • the characteristic curves 36, 38, 40, 42 show increasing toner concentrations TK, the characteristic 42 being a very high one TK toner concentration affects, for example, 7 percent by weight and more.
  • the toner mark 10 has a typical one Length 1 from 8 to 16 mm and a width b from 4 to 10 mm. It differences ⁇ TA im result at the measuring locations a1 and a2 Toner supply, which with increasing toner concentration TK lose weight.
  • FIG. 8 shows the relationship between the voltage U measured by the radiation receiver at the various measuring locations a1, a2 for a black toner with low reflectivity and a red toner with relatively high reflectivity via the toner concentration TK, which is plotted in percent by weight.
  • the maximum voltage Um is obtained when the voltage receiver measures the radiation reflected from the bare surface of the photoconductor drum.
  • the characteristic curves for the red toner and the black toner show the voltage values as measured at the measuring locations a1 and a2.
  • the vertical dashed area corresponds to the respective voltage difference ⁇ U. It depends on the reflectivity of the respective toner.
  • R T is the reflectivity of the respective toner
  • R FLT is the reflectivity of the surface of the photoconductor drum
  • K is a device-side constant for a predetermined area coverage, for example close to 100%.
  • the reflection ratio R T / R FLT can be determined for each toner color and for each photoconductor drum and can then be taken into account in an evaluation, for example in the form of a correction table.
  • the respective voltage difference ⁇ U can then be corrected to take into account different toner types.
  • the ratio of R T / R FLT is very small, since the reflectivity of the respective toner is negligible compared to the reflectivity of the surface of the photoconductor drum.
  • the value R T / R FLT about 1/300 for black toner, and 1/10 is highly reflective toner such as yellow or red toner. The error resulting from the different reflectivities of different toner colors is therefore relatively small.
  • Figure 9 shows a comparison of the reflectivity different types of toner, as expressed by the characteristic curve 46, assuming an area coverage FD close to 100% becomes. The result is shown in the diagram below in FIG. 9 control taking into account the voltage difference ⁇ U shown. A value is specified as the setpoint, where the area coverage FD should be close to 100%. Independently of the absolute reflectivity and the absolute values the voltage U generated by the radiation sensor results for different colored toners a relatively constant value of the area coverage FD. The characteristic of the toner concentration TK, however fluctuates for the different toner colors.
  • FIG. 10 shows the schematic structure of a printing device, in which the invention is implemented.
  • a photoconductor drum FLT turns towards the Arrow P1, wherein a toner image is printed on single sheets 50 becomes.
  • a developer station 52 contains a container 54, in which the developer mixture of toner in carrier is processed.
  • a developer roller 56 transfers the toner on the surface of the FLT photoconductor drum.
  • the photoconductor drum FLT and developer station 52 operate on the Counter-development principle, i.e. the directions of rotation of the The developer roller 56 and the photoconductor drum FLT are each other opposed.
  • a toner conveying device 58 which comes from a reservoir Toner a toner cross feed 60 doses. This toner cross feed 60 delivers the toner to the container 54 from.
  • the toner delivery device 58 includes a drive motor, by a two-point controller 62 in the operating state Is switched ON or OFF.
  • a toner mark 10 is provided on the photoconductor drum FLT and is scanned with the aid of a reflex sensor 64.
  • This reflex sensor 64 contains an LED 66 which emits monochromatic infrared radiation.
  • the use of infrared radiation has the advantage that this radiation reacts less sensitively to the different toner colors, so that their reflectivity is less important in the result.
  • white interference light can be suppressed better by using infrared radiation.
  • the LED 66 is supplied with the current I L from a controllable current source 68.
  • a glass cover 72 is arranged between the photoconductor drum FLT and the reflex sensor 64, which prevents contamination by toner particles.
  • the emitted beam 74 is reflected differently.
  • the reflected radiation is composed of a portion 76 that originates from the surface of the photoconductor drum FLT.
  • a further radiation component 78 results due to the reflection on the glass cover 72.
  • a radiation component 80 which results from the reflection on the toner particles.
  • the radiation reflected overall by the toner mark 10 is detected by a receiving device 82 which contains a receiving diode.
  • the value ⁇ U is compared with a setpoint Us on the controller 62. If ⁇ U is larger than Us, the toner delivery device becomes 58 switched to the ON state and as long as toner promoted until the deviation between ⁇ U and Us approaches Is regulated zero.
  • switch 84 turns towards of arrow 86 switched, which makes the controllable power source 68 is controlled via the controller 62.
  • this adjustment phase a standardization on the reflectivity of the bare surface of the FLT photoconductor drum.
  • the bare surface of the photoconductor drum FLT illuminated by the reflex sensor 64 and in the receiving device 82 the associated voltage value U is measured.
  • the controllable current source 68 is now set so that a constant maximum value Um in the receiving device 82 established. With this setting, the toner mark will later become 10 scanned. By doing this, that the reflectivity of the surface of the photoconductor drum less important in the result because that different reflection behavior is based on the value Um normalized.
  • a transverse to the direction of rotation P1 of the photoconductor drum FLT Character generator arranged in front of the developer station 52 (not shown) writes the latent image or latent ones Images for a toner brand 10 or more toner brands on the surface of the FLT photoconductor drum.
  • the line generator and also the reflex sensor 64 are generally detachable installed, whereby installation tolerances result. these can add up so that the distance along the circumference of the photoconductor drum FLT between character generator and reflex sensor 64 typically fluctuates up to 2 mm.
  • Usually a timer is used to scan the toner marks 10. With the start of writing the latent image a start time is determined by the character generator. Due to the constant rotation speed of the photoconductor drum FLT and the known distance between Line generator and reflex sensor 64 becomes a delay time tm determined from which the sampling time for the toner mark 10 results from the reflex sensor 64.
  • FIG. 11 shows the voltage curve U as the toner mark passes 10 on the reflex sensor 64.
  • the course corresponds to that according to Figure 1.
  • the scanning of the toner mark 10 takes place within a time frame ZR at times T1 to T16.
  • To each Raster times T1 to T16 four samples are obtained, which are fed as digital values to a computer control.
  • the mean value of the 16 samples determined at each time T1 to T16 are used.
  • the averaged samples are stored in a memory cached.
  • the time frame ZR begins at the raster time T1 after expiry the delay time tm.
  • Methods are called measured values, from which the difference is then or the quotient are determined, averaged samples won the times T4 to T7 and T10 to T13.
  • the averaged Samples at times T4 to T7 and T10 up to T13 are again averaged to account for the significant amount of interference to be filtered out in the signals by averaging.
  • the values obtained in this way for the measuring locations a1 and a2 are then further processed.
  • the time frame ZR with respect to the Delay time tm shifted and each time T1 the voltage U sampled.
  • This shifting is done iteratively per toner mark by a time interval between the times T1 and T2.
  • the number of move steps required are to determine the voltage Uh, then indicates by how much the delay time tm has to be corrected by the To scan toner mark 10 at the measuring locations a1, a2, their position a defined distance to the front edge 10a or to the rear edge 10b of the toner mark 10.
  • Sampling at the time T1 is chosen because of interrupt runtimes the interrupt-controlled generation of the times T1 to T16 later times can vary in time. It should also be pointed out here that in FIG Voltage curve U reproduced in a vertically compressed state is; the voltage Uref is much higher in with respect to the voltage Utm as reproduced in the course.
  • Figure 12 shows the state around which the time frame ZR so far has been shifted until the time T1 the voltage Uh to investigate.
  • the number of times to find the voltage Uh required shift clocks is a measure of how much the delay time tm is to correct the toner mark 10 or the toner marks at the predetermined measuring locations a1, a2 scan.
  • the procedure described for determining the exact location of the Toner mark 10 will appear every time the printer is first set up or the copier applied. With this setting, a Large number of toner marks printed on the FLT photoconductor drum, to achieve a high precision in the setting.
  • the method steps mentioned can also be specified in predetermined Intervals, e.g. at intervals of one hour of operation, or each time the printer is turned on or copier (set up) can be used.
  • the embodiment shown can be within the scope of the invention amend.
  • the sensor 64 the toner mark 10 after transfer printing onto a carrier material, for example Paper, palpate.
  • a carrier material for example Paper, palpate.
  • the reflectivity of the carrier material standardized.
  • Another one Variant can instead of a photoconductor drum a photoconductor tape be used. Black toner material, colored toner material, one made of toner materials with different basic colors mixed toner or a transparent toner material can be used. This variant is described for example in WO98 / 39691 A1.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Color Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Claims (35)

  1. Dispositif de copie ou d'impression électrographique, comportant :
    un support de toner (FLT) sur lequel est générée une image latente,
    une station de développement (52) pour colorer l'image latente avec du toner, la station de développement comportant un mélange de développement constitué de toner et de support avec une portion de toner réglable,
       dans lequel au moins une marque de toner (10) sur le support de toner (FLT) en vue de tester et régler le revêtement de surface de toner (FD) est colorée avec du toner,
       dans lequel la marque (10) dotée de toner est détectée en au moins deux points de mesure (a1, a2,) situés l'un à la suite de l'autre, vu dans le sens de déplacement du support de toner (FLT), par au moins un capteur (64), et des signaux électriques (U) sont générés à partir du revêtement de surface correspondant (FD) en ces points de mesure (a1, a2),
       dans lequel un apport de toner (TA) sur la longueur de la marque de toner (10) diminue ou augmente dans une portion, et est constante dans une autre portion,
       dans lequel au moins un des points de mesure (a1, a2) se trouve dans la portion, dans laquelle l'apport de toner (TA) diminue ou augmente,
       et dans lequel, en fonction de la différence (ΔU) ou du quotient des valeurs des signaux en ces deux points de mesure, la portion de toner est réglée dans le mélange de développement.
  2. Dispositif selon la revendication 1, caractérisé en ce que le capteur (64) détecte la marque de toner dotée de toner sur le support de toner (FLT) et/ou sur une matière de support.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la différence (ΔU) ou le quotient est comparé à une valeur de consigne (Us), et en ce qu'un dispositif d'asservissement (62) commande en fonction de cette comparaison un dispositif de transport (58) qui alimente la station de développement (52) en toner.
  4. Dispositif selon la revendication 3, caractérisé en ce que le dispositif d'asservissement (62) est un dispositif d'asservissement à deux positions.
  5. Dispositif selon la revendication 3 ou 4, caractérisé en ce qu'une fraction de la valeur du signal (Um) est prédéterminée comme valeur de consigne (Us), laquelle fraction est générée lors de la réflexion sur la surface du support de toner (FLT) ou de la matière de support, et est de préférence comprise entre 1/300 et 1/10.
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un premier point de mesure (a1) se trouve à l'intérieur du premier tiers de la longueur de la marque de toner (10), vu dans le sens de déplacement du support de toner (FLT).
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un second point de mesure (a2) se trouve à l'intérieur du dernier tiers de la longueur de la marque de toner (10), vu dans le sens de déplacement du support de toner (FLT).
  8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la marque de toner est détectée au moyen d'un capteur de réflexion (64).
  9. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le capteur de réflexion (64) émet un rayonnement infrarouge monochromatique.
  10. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la marque de toner est détectée au moyen d'un capteur capacitif.
  11. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il est calculé la moyenne des signaux sur plusieurs marques de toner, et en ce qu'une différence moyenne de la moyenne calculée des signaux est utilisée comme différence.
  12. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il est utilisé comme toner du toner noir, du toner de couleur, un toner qui est un mélange de toners de couleurs primitives, ou un toner transparent.
  13. Procédé de copie ou d'impression électrographique
       dans lequel est générée une image latente sur un support de toner (FLT),
       dans lequel est prévue une station de développement (52) pour colorer l'image latente avec du toner, ladite station de développement comportant un mélange de développement constitué de toner et de support avec une portion de toner réglable,
       dans lequel au moins une marque de toner (10) sur le support de toner (FLT) en vue de tester et régler le revêtement de surface de toner (FD) est colorée avec du tomer,
       dans lequel la marque (10) dotée de toner est détectée en au moins deux points de mesure (a1, a2) situés l'un à la suite de l'autre, vu dans le sens de déplacement du support de toner (FLT), par au moins un capteur (64), et des signaux électriques (U) sont générés à partir du revêtement de surface correspondant (FD) en ces points de mesure (a1, a2),
       dans lequel un apport de toner (TA) sur la longueur de la marque de toner (10) diminue ou augmente dans une portion, et est constante dans une autre portion,
       dans lequel au moins un des points de mesure (a1, a2) se trouve dans la portion dans laquelle l'apport de toner (TA) diminue ou augmente,
       et dans lequel, en fonction de la différence (ΔU)
    ou du quotient des valeurs des signaux en ces deux points de mesure, la portion de toner est réglée dans le mélange de développement.
  14. Procédé selon la revendication 13, caractérisé en ce que le capteur (64) détecte la marque de toner dotée de toner sur le support de toner (FLT) et/ou sur une matière de support.
  15. Procédé selon la revendication 13 ou 14,
    caractérisé en ce que la différence (ΔU) ou le quotient est comparé à une valeur de consigne (Us), et en ce qu'un dispositif d'asservissement (62) commande en fonction de cette comparaison un dispositif de transport (58) qui alimente la station de développement (52) en toner.
  16. Procédé selon la revendication 15, caractérisé en ce que le dispositif d'asservissement (62) est un dispositif d'asservissement à deux positions.
  17. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un premier point de mesure (a1) se trouve à l'intérieur du premier tiers de la longueur de la marque de toner (10), vu dans le sens de déplacement du support de toner (FLT).
  18. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un second point de mesure (a2) se trouve à l'intérieur du dernier tiers de la longueur de la marque de toner (10), vu dans le sens de déplacement du support de toner (FLT).
  19. Procédé selon l'une des revendications précédentes, caractérisé en ce que la marque de toner est détectée au moyen d'un capteur de réflexion (64).
  20. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'il est calculé la moyenne des signaux sur plusieurs marques de toner, et en ce qu'une différence moyenne de la moyenne calculée des signaux est utilisée comme différence.
  21. Procédé selon des revendications précédentes, caractérisé en ce qu'il est utilisé comme toner du toner noir, du toner de couleur, un toner qui est un mélange de toners de couleurs primitives, ou un toner transparent.
  22. Dispositif de copie ou d'impression électrographique, comportant :
    un support de toner (FLT) sur lequel est générée une image latente,
    une station de développement (52) pour colorer l'image latente avec du toner, la station de développement (52) comportant un mélange de développement constitué de toner et de support,
       dans lequel au moins une marque de toner (10) sur le support de toner (FLT) en vue de tester et régler le revêtement de surface de toner (FD) est colorée avec du toner,
       dans lequel la marque (10) dotée de toner est détectée en au moins deux points de mesure (a1, a2) situés l'un à la suite de l'autre, vu dans le sens de déplacement du support de toner (FLT), par au moins un capteur (64), et des signaux électriques (U), qui sont traités ultérieurement à partir d'une commande, sont générés à partir du revêtement de surface correspondant (FD) en ces points de mesure (a1, a2),
       dans lequel un apport de toner (TA) sur la longueur de la marque de toner (10) diminue ou augmente dans une portion, et est constante dans une autre portion,
       dans lequel au moins un des points de mesure (a1, a2) se trouve dans la portion dans laquelle l'apport de toner (TA) diminue ou augmente,
       dans lequel il est déterminé un instant de référence (Tref) du passage d'un point de référence (10a, 10b) sur la marque de toner au niveau d'un capteur de détection immobile (64),
       et dans lequel la détection des deux points de mesure (a1, a2) est effectuée par rapport à cet instant de référence (Tref).
  23. Dispositif selon la revendication 22, caractérisé en ce que le bord avant (10a) ou le bord arrière (10b) de la marque de toner (10) est utilisé comme point de référence.
  24. Dispositif selon la revendication 22 ou 23, caractérisé en ce que le capteur (64) est utilisé comme capteur de détection qui détecte la marque de toner (10) aux deux points de mesure (a1, a2).
  25. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la détection aux deux points de mesure (a1, a2) est effectuée après un temps de retard prédéterminé (tm) qui s'est écoulé depuis l'instant où a été effectuée l'écriture de la marque de toner (10).
  26. Dispositif selon la revendication 25, caractérisé en ce que le temps de retard (tm) varie en fonction de l'instant de référence (Tref).
  27. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'instant de référence (Tref) est déterminé lorsque le signal électrique (Uh) généré par le capteur de détection (64) satisfait approximativement la relation Uh = (Uref - Utm)/2, où Uref est la tension générée lors de la réflexion du rayonnement sur le tambour photoconducteur nu (FLT), et Utm est la tension générée lors de la réflexion sur la marque de toner (10).
  28. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le capteur (64) de réflexion émet un rayonnement infrarouge monochromatique.
  29. Dispositif selon l'une des revendications précédentes, caractérisé en ce que plusieurs valeurs de détection sont déterminées en chaque point de mesure (a1, a2), et à partir de ces valeurs de détection il est obtenu une valeur moyenne qui est traitée ultérieurement.
  30. Procédé de copie ou d'impression électrographique,
       dans lequel une image latente est générée sur un support de toner (FLT),
       dans lequel l'image latente est colorée dans une station de développement (52) avec du toner, la station de développement (52) comportant un mélange de développement constitué de toner et de support,
       dans lequel au moins une marque de toner (10) sur le support de toner (FLT) en vue de tester et régler le revêtement de surface de toner (FD) est colorée avec du toner,
       dans lequel la marque (10) dotée de toner est détectée en au moins deux points de mesure (a1, a2) situés l'un à la suite de l'autre, vu dans le sens de déplacement du support de toner (FLT), par au moins un capteur (64), et des signaux électriques (U), qui sont traités ultérieurement à partir d'une commande, sont générés à partir du revêtement de surface correspondant (FD) en ces points de mesure (a1, a2),
       dans lequel un apport de toner (TA) sur la longueur de la marque de toner (10) diminue ou augmente dans une portion, et est constante dans une autre portion,
       dans lequel au moins un des points de mesure (a1, a2) se trouve dans la portion dans laquelle l'apport de toner (TA) diminue ou augmente,
       dans lequel il est déterminé un instant de référence (Tref) du passage d'un point de référence (10a, 10b) sur la marque de toner au niveau d'un capteur de détection immobile (64),
       et dans lequel la détection des deux points de mesure (a1, a2) est effectuée par rapport à cet instant de référence (Tref).
  31. Procédé selon la revendication 30, caractérisé en ce que le bord avant (10a) ou le bord arrière (10b) de la marque de toner (10) est utilisé comme point de référence.
  32. Procédé selon la revendication 30 ou 31, caractérisé en ce que le capteur (64) est utilisé comme capteur de détection qui détecte la marque de toner (10) aux deux points de mesure (a1, a2).
  33. Procédé selon l'une des revendications précédentes, caractérisé en ce que la détection aux deux points de mesure (a1, a2) est effectuée après un temps de retard prédéterminé (tm) qui s'est écoulé depuis l'instant où a été effectuée l'écriture de la marque de toner (10).
  34. Procédé selon la revendication 25, caractérisé en ce que le temps de retard (tm) varie en fonction de l'instant de référence (Tref).
  35. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'instant de référence (Tref) est déterminé lorsque le signal électrique (Uh) généré par le capteur de détection (64) satisfait approximativement la relation Uh = (Uref - Utm)/2, où Uref est la tension générée lors de la réflexion du rayonnement sur le tambour photoconducteur nu (FLT) ou une matière de support lorsque la marque de toner est détectée sur la matière de support, et Utm est la tension générée lors de la réflexion sur la marque de toner (10).
EP99904782A 1998-01-16 1999-01-15 Dispositif et procede d'impression ou de photocopie, une marque de toner etant detectee au niveau d'au moins deux points de mesure Expired - Lifetime EP1047980B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19801521 1998-01-16
DE19801521 1998-01-16
DE19821922 1998-05-15
DE19821922 1998-05-15
PCT/EP1999/000211 WO1999036834A1 (fr) 1998-01-16 1999-01-15 Dispositif et procede d'impression ou de photocopie, une marque de toner etant detectee au niveau d'au moins deux points de mesure

Publications (2)

Publication Number Publication Date
EP1047980A1 EP1047980A1 (fr) 2000-11-02
EP1047980B1 true EP1047980B1 (fr) 2002-04-10

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US (1) US6434346B1 (fr)
EP (1) EP1047980B1 (fr)
JP (1) JP2002509291A (fr)
CA (1) CA2316162C (fr)
DE (1) DE59901179D1 (fr)
WO (1) WO1999036834A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1254559A2 (fr) * 2000-02-04 2002-11-06 Océ Printing Systems GmbH Procede et dispositif de regulation de la concentration de toner dans un processus electrographique
DE10136259A1 (de) * 2001-07-25 2003-02-20 Oce Printing Systems Gmbh Verfahren und Einrichtung zum Steuern eines Druckprozesses bei hoher Farbdichte
US6684035B2 (en) * 2002-06-19 2004-01-27 Nexpress Solutions Llc Adjustable automatic process control density patch location detection
DE10234711A1 (de) 2002-07-30 2004-02-12 OCé PRINTING SYSTEMS GMBH Verfahren und Vorrichtung zur Minimierung von unerwünschtem Tonerübertrag in einer Umdruckstation eines elektrografischen Druckgeräts
DE10246733B4 (de) * 2002-10-07 2004-09-30 OCé PRINTING SYSTEMS GMBH Verfahren zur verzögerungsfreien Umsetzung einer Änderung der Einstellung von Druckparameten auf das Druckbild bei einer elektrografischen Druck-oder Kopiereinrichtung
DE10246737A1 (de) * 2002-10-07 2004-01-15 OCé PRINTING SYSTEMS GMBH Verfahren zur Erzeugung eines neuen Träger und Toner aufweisenden Entwicklers in der Entwicklerstation einer elektrografischen Druck- oder Kopiereinrichtung
DE10246736A1 (de) 2002-10-07 2004-04-22 OCé PRINTING SYSTEMS GMBH Verfahren und Vorrichtung zur Einstellung der Tonerzufuhr auf einen Mindestwert in eine Entwicklerstation einer elektrografischen Druck- oder Kopiereinrichtung
US20040196282A1 (en) * 2003-02-14 2004-10-07 Oh Byong Mok Modeling and editing image panoramas
CN100394322C (zh) 2004-03-02 2008-06-11 精工爱普生株式会社 调色剂量的测定装置及测定方法、图像形成装置
DE102006058579A1 (de) 2006-12-12 2008-06-26 OCé PRINTING SYSTEMS GMBH Verfahren und Vorrichtung zum Verarbeiten eines Messsignals zum Erfassen einer Eigenschaft einer Tonermarke
JP4710964B2 (ja) * 2008-11-28 2011-06-29 ブラザー工業株式会社 画像形成装置
JP5822037B1 (ja) * 2015-02-20 2015-11-24 富士ゼロックス株式会社 画像形成装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07120096B2 (ja) * 1986-08-11 1995-12-20 株式会社リコー 記録装置の画像濃度制御装置
JPS63254476A (ja) * 1987-04-11 1988-10-21 Minolta Camera Co Ltd 電子写真複写機
JP3518812B2 (ja) * 1993-04-30 2004-04-12 株式会社リコー 画像形成装置
US5410388A (en) * 1993-05-17 1995-04-25 Xerox Corporation Automatic compensation for toner concentration drift due to developer aging
US5773827A (en) * 1996-12-16 1998-06-30 Xerox Corporation Xerographic infrared reflectance densitometer (IRD) sensor
US5966573A (en) * 1998-10-08 1999-10-12 Xerox Corporation Seamed flexible electrostatographic imaging belt having a permanent localized solid attribute

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Publication number Publication date
WO1999036834A1 (fr) 1999-07-22
DE59901179D1 (de) 2002-05-16
JP2002509291A (ja) 2002-03-26
US6434346B1 (en) 2002-08-13
EP1047980A1 (fr) 2000-11-02
CA2316162C (fr) 2007-09-04
WO1999036834A9 (fr) 1999-10-14
CA2316162A1 (fr) 1999-07-22

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