EP1141787A1 - Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess - Google Patents
Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozessInfo
- Publication number
- EP1141787A1 EP1141787A1 EP99967019A EP99967019A EP1141787A1 EP 1141787 A1 EP1141787 A1 EP 1141787A1 EP 99967019 A EP99967019 A EP 99967019A EP 99967019 A EP99967019 A EP 99967019A EP 1141787 A1 EP1141787 A1 EP 1141787A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- toner
- intermediate image
- image carrier
- recording medium
- mark
- 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.)
- Granted
Links
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
- G03G15/5033—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
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
- G03G15/0189—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to an intermediate transfer belt
-
- 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
-
- 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
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
- G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
- G03G15/238—Arrangements for copying on both sides of a recording or image-receiving material using more than one reusable electrographic recording member, e.g. single pass duplex copiers
-
- 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
- G03G2215/00059—Image density detection on intermediate image carrying member, e.g. transfer belt
Definitions
- the invention relates to a method and a device for controlling an electrographic printing or copying process.
- the invention particularly relates to a method and a system for regulating the toner concentration in a toner / developer mixture.
- EP 403 523 B1 describes an electrographic process in which a number of process parameters are monitored and regulated, including the toner concentration in a developer station. For this purpose, it is provided to generate a toner mark on a photoconductor drum, to scan the mark with a reflected light sensor on the photoconductor drum and to use the measured value to control the toner replenishment in the developer station.
- the full-surface toner mark is produced on the side edge of the photoconductor drum, so that it lies only in the area of the marginal holes with respect to the web-shaped recording medium provided with edge holes and thus not in the actual writing area of the recording medium or the photoconductor drum.
- the toner mark can only be made relatively small, as a result of which the scanning area and thus also the measuring accuracy is limited, in particular transversely to the transport direction of the photoconductor drum or of the recording medium.
- it is sometimes sensible to also apply and scan a toner mark in the actual writing area of the photoconductor drum.
- web-shaped recording media such as so-called continuous paper
- paper waste arises because the recording medium printed in this way can be used for printing other information is no longer available.
- edge effects for example of the electrical field, arise at the edges of a photoconductor, as a result of which the meaningfulness of a measurement in this area is weakened. The narrower a toner mark is, the more such edge effects overlap.
- WO 97/17535 A describes an electrophotographic printing device which contains compensating elements, in particular swing arms, springs and other tendons, which are intended to avoid fluctuations in the position of the recording medium in the area of the transfer printing zone. This is particularly necessary in a duplex operation in which the web-shaped recording medium is guided twice through the same transfer printing station. Regarding the regulation of the electrographic process, however, nothing significant can be found in this publication.
- An edge-hole-free recording medium can then also be printed by the photoconductor drum in the area of the drum in which the edge perforation is located in the case of an edge-perforated recording medium.
- this advantage is accompanied by the disadvantage that the toner mark has to be reprinted onto the unperforated web-shaped recording medium in its writing area, and this in turn produces waste.
- US Pat. No. 5,387,965 A and US Pat. No. 4,468,112 A disclose electronic processes in which the toner concentration in a developer station is determined and compared with a target value. The setpoint depends on a second measuring process in which a toner mark is evaluated.
- the information to be printed is generated as an intermediate toner image on an intermediate image carrier with a photoconductor drum and later in a transfer zone from a transfer surface, for example from the surface of the photoconductor drum or from a transfer transfer belt, onto a recording medium transfer.
- a toner mark is generated on the electrographic intermediate image carrier, the toner mark on the intermediate image carrier is scanned at least in regions and the toner mark is later removed from the intermediate image carrier again.
- the density in particular is scanned at the toner mark.
- the toner concentration is then regulated with the measured value, in particular density value, in a developer station so that the coloring can be kept constant.
- a transfer of the intermediate toner image from the transfer printing surface to the recording medium is at least temporarily prevented.
- This hindrance to transfer printing is prevented in particular during a period in which the toner mark passes the transfer printing zone.
- Prevention of transfer printing can be done in particular by separating / lifting the recording medium from the transfer printing surface.
- the invention provides in particular two operating states for operating an electrographic printing or copying device.
- the first operating state the so-called measurement cycle
- a toner mark is generated on the intermediate image carrier, the density of the toner mark is scanned and the toner mark is then removed from the intermediate image carrier again.
- the sampled toner density value is used to regulate the toner concentration in the developer station and finds particular influence in a nominal toner concentration value and / or in a regulating threshold value.
- information to be printed is generated on the intermediate image carrier as a toner image and later printed on the record carrier.
- the toner concentration is controlled in particular with the toner concentration or control threshold value determined from the first operating state.
- the recording medium is at least temporarily from the transfer printing surface in the first operating state, in particular from the intermediate image carrier, separated or lifted off.
- the invention is therefore suitable for generating the toner mark on the intermediate image carrier in an area in which the information to be printed on the record carrier is also output.
- the record carrier is in particular web-shaped and can be made of paper, for example.
- a photoconductor drum is provided as the intermediate carrier on which the toner mark is produced.
- the record carrier is separated from it for at least one revolution.
- a photoconductor belt is used as the first intermediate image carrier and / or a transfer belt is used as the second intermediate image carrier.
- Information to be printed is generated on the first intermediate image carrier, then transferred to the transfer belt and finally printed from the transfer belt onto the recording medium.
- density values of several toner marks can be used to determine the target value in the toner concentration control.
- the different toner marks can originate from several measuring cycles which are far apart in time or can be formed in a coherent measuring cycle, in particular with one or more revolutions of the photoconductor drum.
- a fast switchable, high-precision mechanical lifting device can be used in particular to separate the recording medium from the transfer printing surface.
- the recording medium is in almost the same position both in the transport direction and transversely to the transport direction before it is lifted off and after it is pivoted back with respect to the transfer printing station.
- the recording medium can either be moved or the transfer printing surface or the transfer printing element can be moved.
- an electrophotographic size in the area of the transfer printing station is changed so that transfer printing is prevented. For example, the electrical voltage at a transfer printing corotron can be reduced.
- the invention creates two operating states of the device, which are used alternately in time.
- the operating state in which the toner mark is generated and evaluated and there is no transfer printing on the recording medium is switched in time between the other operating state in which printing information is printed on the recording medium.
- a particular advantage of the invention is that the toner mark can be designed to be very wide, up to the entire width of the intermediate image carrier, e.g. a photoconductor drum. As a result, the toner mark can be evaluated at several points, in particular according to the method described in DE 198 01 521.6.
- the content of this application and the WO publication corresponding to this application are hereby incorporated into the present description.
- the toner mark can also be positioned anywhere within the printing width of the intermediate image carrier. These possibilities not only increase the measuring accuracy compared to narrow toner marks, but also create the possibility of using different methods for evaluating the toner mark instead of evaluating the toner density. For example, it is also possible to evaluate the shape of the toner mark produced or to compare it with a target shape. This further enables the evaluation methods for color toners to be optimized. Different evaluation methods can be combined to form an overall evaluation, for example, different evaluation methods and / or color-specific properties of the toner mark sensor can be taken into account with respect to the color of the toner.
- the evaluation method of the toner mark can be designed in such a way that independence from the toner color can be achieved. This applies in particular also in the case in which an optoelectronic toner mark sensor works in a narrow light wavelength spectrum, for example only in one color, and its light has a direct effect on the reflection and absorption behavior of the toner pigments. In this case, in particular the shape recognition of a large-area mark can be used advantageously.
- toner marks are generated and scanned cyclically in an electrographic process only at relatively large page intervals, for example only after a few thousand printed pages.
- the toner concentration is then different, i.e. based on other parameters only.
- Such a different measurand can e.g. be the toner concentration measured in the developer station with a toner concentration sensor.
- a target value is determined from the measured value determined by the toner mark (toner density, toner mark shape, etc.), e.g. for the toner concentration or for a regulation threshold and the toner concentration thus regulated.
- This toner concentration control in a developer station to be used in the intervals between the toner mark measurements can be carried out in a manner known per se.
- the subsequent toner conveyance is regulated in a different way over relatively large printing intervals (between the toner mark evaluation cycles).
- the toner consumption can also be determined on the basis of the printed information, in particular by the total number of printed pixels. This determination can also be made depending on the set contrast ratio, a certain transfer efficiency, the age of the toner / developer mixture, the type of toner and / or other influencing factors. The quantities of toner determined in this way can then be used to regulate the toner supply into the developer station from a toner reservoir.
- the second aspect of the invention achieves the object of being able to carry out a largely independent regulation of the toner coloring in an electrophotographic process in the intervals between the formation and measurement of the toner mark.
- FIG. 1 shows a schematic sectional illustration of an electrophotographic printing device
- FIG. 2 electronic components of the printing device
- Figure 3 is a flow chart for printing and generating a toner mark
- Figure 4 shows a second electrographic printing device.
- a printing device 1 for web-shaped recording media working according to the principle of electrophotography is shown schematically.
- the web-shaped recording medium in the form of a paper web 2 is fed from a drive unit 3 with a motor-driven friction roller 19 in the direction A x to a photoconductor drum 4.
- the unit additionally contains movable swivel elements 15 with which the paper web 2 can be pressed against the surface of the photoconductor or can be lifted off the latter. For this purpose, they can be moved automatically with an electrical actuator 20, for example a stepping motor or lifting magnet.
- Suitable swivel elements are known in the form of transfer printing rockers, for example from WO 97/17635 AI. They can be designed in particular like the rockers 40 and 44 shown in FIG. 5 of the WO publication, and can be pivotably mounted on axes in such a way that the paper web can be pivoted in and out length-neutral with respect to parts of the drive unit which are further away.
- the content of WO 97/17635 AI is hereby also incorporated by reference into the present description.
- the paper web 2 is printed in a transfer printing zone 5.
- an intermediate toner image is applied to the via a driven photoconductor drum 4 by various coupled units, which intermediate image is printed on the paper web 2 in the transfer printing zone 5.
- a first unit is a character generator 6, which contains a light emitting diode comb with individually controllable light elements and which can be constructed, for example, in accordance with WO 96/3782 AI. This publication is hereby incorporated by reference into the present description.
- the character generator 6 can be regulated in its light intensity by varying the control voltage or the control current.
- An electronic controller controls the individual light emitting diodes in accordance with the image information to be printed.
- a charging sensor 7 adjoins the exposure station 13, which measures the surface potential on the photoconductor drum 4 and emits a signal as a function thereof.
- the image (charge image) generated on the photoconductor drum 4 depending on the character with the character generator 6 is colored using a developer station 8.
- the developer station 8 contains a toner reservoir 9 for receiving toner as well a metering device 10 in the form of a metering roller.
- the metering roller 10 supplies toner to a mixing chamber 11.
- the mixing chamber 11 there is a toner / developer mixture of ferromagnetic carrier particles and toner particles.
- the toner mixture is fed to a developer roller 12.
- the developer roller 12 acts as a so-called magnetic brush roller and consists of a hollow roller with magnetic strips arranged therein.
- the developer roller 12 transports the developer mixture to a development nip 13 between the photoconductor drum 4 and the developer roller 12. Excess developer mixture is transported back into the mixing chamber 11 via the developer roller 12.
- the toner mark sensor 14 is an optoelectronic scanner, which can be designed, for example, as a reflection light barrier. It consists of a light source and a photo transistor as a receiver.
- the output signal of the phototransistor depends on the reflectance of the information applied to the photoconductor drum 4 and colored by the developer station.
- the sensor is used in particular to scan a toner mark which is used to determine the color saturation, ie the applied optical density of the toner mark.
- the wavelength of the reflection light barrier is selected so that the scanning light has no influence on the function of the photoconductor drum 4.
- the toner mark is started when a test routine is called up or automatically, for example after 2000 printed pages.
- the toner mark that is then generated is scanned and the test pattern is evaluated, for example with regard to color density and / or color saturation.
- the paper web 2 is pivoted away from the photoconductor drum 4 so that it does not touch the surface of the photoconductor drum in the transfer printing zone 5.
- the drive unit 3 or the pressure elements 15 pressing the paper web 2 against the photoconductor drum 4 are then pivoted away from the photoconductor drum 4.
- a cleaning device 16 behind which the residual toner, which has not been released from the photoconductor drum 4 in the region of the transfer printing zone 5 or has been transferred onto the paper 2, is removed from the photoconductor drum 4.
- the cleaning station 16 is constructed in a conventional manner and contains e.g. a wiping element 17, which wipes off the excess toner or the carrier particles from the photoconductor drum 4.
- the cleaning process is supported by a corona device 18.
- further corona devices are provided in the printing device in a manner known per se. This includes, for example, a charging corotron, which is provided between the cleaning device 16 and the character generator 6.
- Exposure devices which serve to discharge the photoconductor drum 4 can also be arranged in the device. Further details on the electrophotographic process and the associated devices are described, for example, in EP 403 523 B1, the content of which is hereby incorporated by reference into the present description, as is the content of the corresponding patent in the U.S.A.
- FIG. 2 shows a device controller 25 of the electrographic printer, which is connected to all electronic components of the various units of the device, so that the processes can be coordinated with one another.
- the device controller 25 is connected on the one hand to a controller 26, in which print data to be printed is received and the signals of the character generator 6 which are controllable at points are converted into signals which can be controlled. These signals are transmitted to the controller 27 of the character generator.
- the device controller 25 is connected to a controller 28 which controls electrophotographic parameters such as the voltages of corotron wires.
- the toner mark sensor 14 scanning the photoconductor drum 4 has electronic components 29, which are also connected to the device control 25.
- the controller 30 of the developer station 8 exchanges data on two sides with the device controller 25.
- the toner concentration sensor 21, which measures the concentration of the toner in the toner / developer mixture in the mixing chamber 11 of the developer station 8, has an electronic assembly 31, which is also connected to the device controller 25.
- the device control 25 is still connected to the electronic control 32 of the drive unit 3.
- the controller 32 controls, in particular, components 33 of the stepping motor, which moves the paper web 2, and the electronic components 34, which activates the stepping motor 20 or a corresponding lifting magnet for the pressure elements 15.
- the various pressure elements 15 can also be equipped with their own stepper motors or solenoids in order to be able to individually press the rockers.
- the device control 25 is connected to electronics 35 which cause the toner to be conveyed from an external toner reservoir into the developer station. Further electronics can be provided within the developer station, which controls the metering of the toner from the toner reservoir 9 into the mixing chamber 11 by means of the metering roller 10.
- step S1 A first operating state is shown in the method steps S1 to S5, in which print data are printed on the paper web 2.
- step S1 it is checked whether print data is available. If this is not the case, the printing device switches to a stand-by state in which various units such as the photoconductor drum, transfer printing corotrone, the transport unit, etc. are set for low energy consumption.
- the device control 25 receives a signal from the controller 26 that print data is available, it activates the units involved, in step S3 the electrophotographically relevant units and in step S4 the transport unit 3.
- the servomotor 20 is activated by which the paper web 2 is pivoted to the surface of the photoconductor drum 4. Furthermore, the drive motor is activated, which sets the friction transport roller 19 in motion for transporting the paper web.
- the print data to be output are then written via the character generator 6 onto the photoconductor drum 4 as an intermediate toner image, the intermediate toner image is applied onto the photoconductor drum in the developer nip 13 of the developer station 8 onto the photoconductor drum 4 and is printed onto the paper web 2 in the transfer printing zone 5.
- the toner image thus re-printed is later fixed in a fixing device on the recording medium 2.
- the toner concentration in the developer station 8 is controlled by a toner concentration control.
- the sensor 21 permanently detects the toner concentration in the developer station 8 and maintains a constant toner-developer mixture in the mixing chamber 11 by appropriate subsequent conveying with the conveying device 10.
- the toner concentration sensor 21 As an alternative to regulating the toner concentration with the toner concentration sensor 21, it is also possible to control the amount of toner conveyed by the device 10 per unit of time by counting the re-printed, set pixels in the controller 26 and / or other variables determining the toner consumption, such as to use the contrast setting of the image, the temperature of the photoconductor drum or the like to determine the amount of toner delivered.
- the normal printing process is interrupted and the current development conditions are checked using a toner mark.
- the paper web 2 in the transfer printing zone 5 is first pivoted away from the surface of the photoconductor drum 4 by means of the pressure elements 15. The paper transport is also stopped.
- step S9 the value of the page counter is stored in a memory of the printer controller 25.
- Steps S12 to S17 describe a second operating state in which a toner mark is written and evaluated on the photoconductor 4 in order to modify the toner delivery control which takes place during the transfer printing phase (S5) in normal printing operation.
- step S12 one or more toner marks are successively written on the photoconductor drum 4.
- the toner marks can be generated during one revolution of the photoconductor drum or, alternatively, several toner marks over several revolutions of the photoconductor drum 4.
- the toner marks are so wide that they enter the write area of the photoconductor drum, in which printing information is output during normal printing operation (step S5) normally be printed on the paper web 2. If necessary, the toner mark can even extend across the entire width of the photoconductor drum 4. Toner marks generated in this way on the photoconductor drum 4 or the marks are scanned with the sensor 14 in step S13 and evaluated in the controller 25. The evaluation can take place with regard to the generated toner density and / or with regard to the shape of the toner mark.
- the toner mark or the toner marks can have different densities, shapes and / or dimensions.
- a value is then derived from the values, which is compared in step S14 with a control threshold value RS. If the toner density value OD of the toner marks lies in the interval [RS- ⁇ , ..., RS + ⁇ ], the operating mode of the toner mark printing can be terminated in step S17 and the normal printing operating mode can be switched back to.
- step S15 If, on the other hand, the toner density OD lies outside the interval [RS- ⁇ , ..., RS + ⁇ ], toner delivery is initiated in step S15 and a further toner mark is generated in step S12. This process (steps S12 to S15) is repeated until the coloration OD of the toner mark lies in the required interval. Finally, at least one correction value is determined from the operating mode of the toner mark generation in step S16, with which the regulation of the toner concentration in the normal printing phase is adapted (steps S5 to S8). In particular, a control threshold value for the toner concentration is changed.
- the toner concentration control in the pressure intervals which lie between the adjustment operating states in which toner marks are formed and evaluated can be carried out, for example, according to the methods described in US 4,468,112 A or US 5,387,965 A. The contents of which are hereby incorporated by reference into the present description.
- a difference is formed from the measured toner density and the target value of the toner density and the difference value is used to determine a new toner concentration target value or a threshold value for the toner concentration control.
- a factor from the measured value for the toner density is used to change a desired toner concentration value and / or a toner concentration control threshold value.
- the amount of toner conveyed into the developer station per unit of time can also be adapted in step S12.
- other parameters such as the sum of the set (i.e. black pixels), the temperature of the photoconductor drum or the set image contrast can also be taken into account for more precise control.
- a further printing device is described in FIG. 4, in which at least one latent image is generated on a photoconductor belt 122 in a first printing unit 150 by a first character generator 124.
- a first character generator 124 With a plurality of developer stations 126a, 126b,... 126e, which contain toners of different colors, one or more intermediate toner images are generated on the photoconductor belt 122 in the direction of movement B.
- latent images and intermediate toner images of different colors are generated by a second character generator 138 and by a plurality of developer stations 140a to 140 in a second printing unit 152 on a second photoconductor belt 136 in the direction of movement D.
- the intermediate toner images are transferred from the first photoconductor belt 122 to a first, in Transfer ribbon 130 running in the direction C and correspondingly at a third transfer printing point 142 from the second photoconductor ribbon 136 to a second transfer ribbon 144 which moves in the direction E.
- the transfer belts 130, 132 each collect the intermediate toner images of the different color separations and then print the full-color image at a second transfer station 132 or a fourth transfer station 146 on the web-shaped recording medium 114 on both sides, that is to say duplex.
- the recording medium 114 which is driven by friction with transport rollers 116, then passes through a fixing station 118 in the transport direction A for fixing the two toner images and is subsequently cooled in a cooling device 120.
- an operating state is carried out with the present invention in which a toner mark from the character generators 124 or 138 and from at least one of the developer stations 126a to 126e or 140a to 140e on at least one Photoconductor 1122, 136 is generated.
- the toner mark is then re-printed on one of the transfer belts 130, 144, scanned there by one of the optoelectronic sensors 154, 156 and removed from the transfer belt without being re-printed on the paper web 114.
- the two transfer belts 130 and 144 can be lifted off the paper web 114 in the area of the transfer printing stations 132 and 146, so that the transfer printing onto the paper 114 can be prevented.
- the toner mark can also be scanned on the photoconductor belts 122, 136 by corresponding sensors. Then either the transfer printing on the transfer belts 130, 144 or the transfer printing on the paper web 114 is prevented.
- the transfer ribbons 130, 144 off the paper web 114 and / or the transfer ribbons 130, 144 off the photoconductor ribbons 122, 136 there are correspondingly fast switching means in the Area of the transfer printing zones 132, 146 and / or 128, 142 provided.
- the coloring is determined in particular only by the toner concentration control, at least one of its control variables, e.g. the control threshold value of the toner concentration can be determined by the first operating state, namely the generation of the toner mark.
- This variant of the invention is therefore also to be regarded as a toner brand-guided toner concentration control.
- the invention can also be used in a device for single sheets.
- the prevention of transfer printing in the operating state in which a toner mark is formed and evaluated can be done, for example, in such a way that the supply of a sheet-like recording medium to the transfer printing station is completely prevented.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19900164 | 1999-01-05 | ||
DE19900164A DE19900164A1 (de) | 1999-01-05 | 1999-01-05 | Verfahren und Einrichtung zur Regelung der Tonerkonzentration in einem elektrografischen Prozess |
PCT/EP1999/010465 WO2000041038A1 (de) | 1999-01-05 | 1999-12-29 | Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1141787A1 true EP1141787A1 (de) | 2001-10-10 |
EP1141787B1 EP1141787B1 (de) | 2004-02-25 |
EP1141787B2 EP1141787B2 (de) | 2010-03-24 |
Family
ID=7893610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99967019A Expired - Lifetime EP1141787B2 (de) | 1999-01-05 | 1999-12-29 | Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess |
Country Status (5)
Country | Link |
---|---|
US (1) | US6498909B1 (de) |
EP (1) | EP1141787B2 (de) |
JP (1) | JP4301735B2 (de) |
DE (2) | DE19900164A1 (de) |
WO (1) | WO2000041038A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1254559A2 (de) * | 2000-02-04 | 2002-11-06 | Océ Printing Systems GmbH | Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess |
DE10136259A1 (de) | 2001-07-25 | 2003-02-20 | Oce Printing Systems Gmbh | Verfahren und Einrichtung zum Steuern eines Druckprozesses bei hoher Farbdichte |
DE10233671A1 (de) | 2002-07-24 | 2004-02-05 | OCé PRINTING SYSTEMS GMBH | Verfahren und Vorrichtung zum Einstellen der Tonerkonzentration in der Entwicklerstation eines elektrofotografischen Druckers oder Kopierers |
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 |
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 |
DE10250827B3 (de) | 2002-10-31 | 2004-07-15 | OCé PRINTING SYSTEMS GMBH | Verfahren, Steuerungsschaltung, Computerprogrammprodukt und Druckgerät für einen elektrografischen Prozess mit temperaturkompensierter Entladetiefenregelung |
DE102004005964A1 (de) | 2004-02-06 | 2005-09-08 | OCé PRINTING SYSTEMS GMBH | Steuerungseinrichtung und Verfahren zum Steuern eines elektrofotografischen Druckers oder Kopierers |
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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 |
DE102007002146B4 (de) | 2007-01-15 | 2008-11-27 | OCé PRINTING SYSTEMS GMBH | Verfahren zur Erhöhung der Druckgeschwindigkeit eines elektrografischen Farbdruckgeräts bei dessen Einsatz für Einfarbendruck |
US7890005B2 (en) * | 2009-01-07 | 2011-02-15 | Infoprint Solutions Company, Llc | Adjusting electrostatic charges used in a laser printer |
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JPS5767943A (en) | 1980-10-16 | 1982-04-24 | Konishiroku Photo Ind Co Ltd | Retention type electrostatic recorder |
US4468112A (en) | 1981-02-18 | 1984-08-28 | Canon Kabushiki Kaisha | Developer concentration controlling device |
DE3807121A1 (de) | 1988-03-04 | 1989-09-14 | Siemens Ag | Elektrofotografische druckeinrichtung mit geregeltem elektrofotografischen prozess |
US5122835A (en) | 1991-05-06 | 1992-06-16 | Eastman Kodak Company | Compensating densitometer readings for drifts and dusting |
JP3542085B2 (ja) | 1991-12-09 | 2004-07-14 | 株式会社リコー | トナー濃度制御方法及び画像形成装置 |
JPH06289716A (ja) * | 1993-03-31 | 1994-10-18 | Fuji Xerox Co Ltd | 画像記録装置の濃度調整方法 |
US5518828A (en) | 1994-07-21 | 1996-05-21 | Bechtel Group, Inc. | Thermal integration of an air-cooled fuel cell stack |
EP0740221B1 (de) * | 1995-04-26 | 2001-10-10 | Canon Kabushiki Kaisha | Bilderzeugungsgerät und Zwischenübertragungselement |
JP3278553B2 (ja) † | 1995-07-18 | 2002-04-30 | キヤノン株式会社 | 画像形成装置 |
US5678131A (en) | 1995-08-22 | 1997-10-14 | Eastman Kodak Company | Apparatus and method for regulating toning contrast and extending developer life by long-term adjustment of toner concentration |
DE19541061C1 (de) | 1995-11-03 | 1996-11-07 | Siemens Nixdorf Inf Syst | Elektrografischer Drucker mit Ausgleichsvorrichtungen |
JP3576709B2 (ja) * | 1996-07-22 | 2004-10-13 | キヤノン株式会社 | 画像形成装置及び方法 |
JP3589270B2 (ja) * | 1996-10-21 | 2004-11-17 | セイコーエプソン株式会社 | 画像形成方法 |
JPH10274891A (ja) * | 1997-03-31 | 1998-10-13 | Ricoh Co Ltd | 画像形成装置 |
JP3508499B2 (ja) * | 1997-09-10 | 2004-03-22 | ミノルタ株式会社 | 画像形成装置 |
DE19749651C2 (de) | 1997-11-10 | 1999-10-14 | Oce Printing Systems Gmbh | Vorrichtung zum traktorlosen Transport eines bandförmigen Aufzeichnungsträgers in einem elektrografischen Aufzeichnungsgerät |
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1999
- 1999-01-05 DE DE19900164A patent/DE19900164A1/de not_active Withdrawn
- 1999-12-29 EP EP99967019A patent/EP1141787B2/de not_active Expired - Lifetime
- 1999-12-29 JP JP2000592699A patent/JP4301735B2/ja not_active Expired - Fee Related
- 1999-12-29 WO PCT/EP1999/010465 patent/WO2000041038A1/de active IP Right Grant
- 1999-12-29 DE DE59908673T patent/DE59908673D1/de not_active Expired - Lifetime
- 1999-12-29 US US09/869,750 patent/US6498909B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO0041038A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6498909B1 (en) | 2002-12-24 |
DE19900164A1 (de) | 2000-07-27 |
JP2002534715A (ja) | 2002-10-15 |
WO2000041038A1 (de) | 2000-07-13 |
EP1141787B2 (de) | 2010-03-24 |
DE59908673D1 (de) | 2004-04-01 |
JP4301735B2 (ja) | 2009-07-22 |
EP1141787B1 (de) | 2004-02-25 |
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