EP1203269B1 - Procede et commande pour la regulation de position d'un support d'image en forme de bande dans un appareil electrographique - Google Patents

Procede et commande pour la regulation de position d'un support d'image en forme de bande dans un appareil electrographique Download PDF

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Publication number
EP1203269B1
EP1203269B1 EP00958339A EP00958339A EP1203269B1 EP 1203269 B1 EP1203269 B1 EP 1203269B1 EP 00958339 A EP00958339 A EP 00958339A EP 00958339 A EP00958339 A EP 00958339A EP 1203269 B1 EP1203269 B1 EP 1203269B1
Authority
EP
European Patent Office
Prior art keywords
band
image carrier
intermediate image
mark
values
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
EP00958339A
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German (de)
English (en)
Other versions
EP1203269A1 (fr
Inventor
Josef Schreieder
Stefan Scherdel
Franz Hintler
Heiner Reihl
Otto Ferber
Winfried Topp
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
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 Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Publication of EP1203269A1 publication Critical patent/EP1203269A1/fr
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Publication of EP1203269B1 publication Critical patent/EP1203269B1/fr
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
    • G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
    • G03G15/754—Details relating to xerographic drum, band or plate, e.g. replacing, testing relating to band, e.g. tensioning
    • G03G15/755—Details relating to xerographic drum, band or plate, e.g. replacing, testing relating to band, e.g. tensioning for maintaining the lateral alignment of the band
    • 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
    • G03G15/0194—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to the final recording medium
    • 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
    • G03G2215/00135—Handling of parts of the apparatus
    • G03G2215/00139—Belt
    • G03G2215/00143—Meandering prevention
    • G03G2215/00156—Meandering prevention by controlling drive mechanism
    • 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
    • G03G2215/00135—Handling of parts of the apparatus
    • G03G2215/00139—Belt
    • G03G2215/00143—Meandering prevention
    • G03G2215/0016—Meandering prevention by mark detection, e.g. optical
    • 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
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00556—Control of copy medium feeding
    • G03G2215/00586—Control of copy medium feeding duplex mode

Definitions

  • the invention relates to a method and a controller for position control of a band-shaped intermediate image carrier in an electrographic device.
  • band-shaped intermediate image carrier are usually deflected by rollers.
  • an uncontrolled transported intermediate carrier would drift from its desired track transversely to the transport direction.
  • Such an intermediate image carrier and such an electrographic printing device are described for example in US-A-4,061,222.
  • the intermediate carrier is an endless belt, which is guided over a plurality of guide rollers.
  • the tape has a photosensitive, photoconductive layer on which an image can be generated by means of optical signals.
  • the image is then dyed in a developer station according to the optically applied information with toner, transferred to a transfer station on a recording medium.
  • the lateral position of the photoconductor belt is controlled.
  • a sensor is provided which detects a lateral edge of the photoconductor belt. With the position signals a servomotor for tilting a guide roller is driven and thus formed a control loop for the position of the band edge.
  • the controlled track will track the band edge. Depending on the quality of the strip edge, this leads to a restless and thus unfavorable running behavior of the strip.
  • the applied marks are then detected with a sensor over a complete belt revolution and the brand positions are stored as X positions of the belt.
  • the lateral position of one edge of the tape is scanned with a second sensor.
  • the resulting Y value is stored together with the associated X value as a value pair in a table.
  • the last stored X value of the value pairs corresponds to the photoconductor band of the same position mark as the first X value.
  • the difference between the first Y value and the last Y value corresponds to the amount that the tape has run sideways within the one revolution.
  • the determined Y values are then corrected.
  • the number table thus obtained reflects the actual shape of the band edge.
  • Each marked The X position of the band is thus uniquely assigned a Y setpoint via the stored table values.
  • EP-B1-608 124 a method and apparatus is known in which the lateral position of a photoconductor belt in an electrophotographic printing machine is controlled with a control coefficient.
  • a control coefficient is then determined.
  • For detecting the band edge position a plurality of notches are provided in the photoconductor belt, forming a Z-like shape. These notches are detected with a transmitted light sensor.
  • the diverting pulley can perform both a pivoting movement to vary the lateral belt position and a linear movement along the belt running direction to minimize friction during the pivotal movement.
  • EP-A-785 480 a further apparatus for controlling the lateral position of an endless belt in an electrophotographic printing machine is known.
  • the tape over a Guide roller guided, which is tilted on the one hand to control the lateral tape position and on the other hand connected to the tape drive with a drive motor.
  • the object of the invention is to provide a method and a system with which the lateral position of a band-shaped intermediate image carrier in an electrographic device can be maintained as accurately as possible.
  • the invention provides in a first aspect that for regulating the lateral position of a band-shaped intermediate image carrier, a mark is detected regularly with a device-fixed sensor, time correlated with the detection of Mark the lateral position of the intermediate image carrier is detected transversely to the transport direction and between the regular detection of the mark time-controlled intermediate measurements in the position of the intermediate image carrier are performed.
  • the detected position values of the intermediate image carrier are respectively compared with stored or calculated setpoint position values, and the comparison values are used to control position correction means with which the position of the intermediate image carrier can be changed transversely to the transport direction.
  • an improvement over known, controlled devices is achieved in that a single mark on the intermediate image carrier is sufficient, and yet a high guidance accuracy can be achieved.
  • the scanning locations along the band edge, which result from this timing, in principle allow an arbitrarily high position determination, which is essentially determined by the timing, in particular by the frequency of the interim measurements initiated by the trigger mark or the trigger marks.
  • the signals of a timer for example a high-frequency quartz resonant circuit, are suitable for determining the times of the intermediate measurements.
  • the intermediate image carrier is moved at a constant speed along the transport direction. Constant temporal pulses for the intermediate measurements then correspond to constant distances (positions) on the intermediate image carrier.
  • the invention also allows conclusions about the tape in the transport direction by the position of the trigger mark is synchronized with the signals of the timer. By this mutual condition of the measurement accuracy in the transport direction and transverse to the transport direction can be achieved with relatively little effort, a highly accurate, self-stabilizing tape transport system.
  • the running track of an endless belt is monitored by continuous scanning of a belt edge. Deviations from the target track are thereby continuously corrected by tilting one of the rollers over which the belt passes in a suitable manner.
  • a band-shaped intermediate image carrier is provided with structured marks, which lie in a track along the running direction of the tape. In particular, they can lie periodically or statistically at a well-defined distance from the lateral band edge.
  • the marks have one or more oblique edges to the vertical of the running direction, of which at least two edges are not parallel.
  • the marks are scanned periodically with a sensor which has several measuring points along the transport direction.
  • CCD lines charged coupled device
  • the mark has at least one edge which is inclined to the transport direction of the intermediate image carrier so that it is not perpendicular to it.
  • the stamps are preferably triangular stamps.
  • the position of the band-shaped intermediate image carrier is exactly measurable both in the transport direction and perpendicular to the transport direction in the range of the mark.
  • the second aspect of the invention also makes it possible to determine both the positions and the speed of the belt in the transport direction with high accuracy with relatively little effort.
  • an apparatus for tensioning an endless belt comprises a deflection roller for deflecting the belt, which is linearly movable along a first axis to compensate for belt length tolerances and is pivotable about a second axis for controlling the lateral belt position.
  • the two axes may be parallel to each other, in particular even identical, but also inclined to each other, in particular perpendicular to each other.
  • the two movements of the guide roller are executable via a lever arrangement, but decoupled from each other by two separate guides are provided for the linear movement on the one hand and for the pivoting movement on the other hand.
  • the linear motion can be assisted by a spring acting against the belt tension.
  • the pivoting movement takes place by means of a drive which is connected without play to the roller.
  • the backlash is achieved in particular by a preloaded slide. It can, for example a directly connected to the drive cam (eccentric) roll on a force acting on the guide roller lever assembly, which is biased relative to the cam with a spring.
  • the drive for the pivoting movement is regulated in particular.
  • a sensor may be provided which scans the lateral edge of the tape-shaped image carrier.
  • a mechanical push button sensor provided with a Hall sensor can be used for scanning the lateral band edge.
  • Said embodiment allows the highly accurate, controlled positioning of the guide roller both in the tape running direction and transversely to the direction of tape travel and thus a precise position of the intermediate carrier belt during operation.
  • Another embodiment relates to a sensor for scanning the position of the lateral edge of a strip-shaped material, in particular an intermediate image carrier.
  • the sensor is designed as a mechanical scanning sensor in which a lever provided with a permanent magnet bears under pretension on the band edge and its measuring signals are generated by a Hall sensor.
  • the printing device shown in FIG. 1 for the performance-adapted, monochrome and / or colored, one- or two-sided printing of a tape-shaped recording medium 10 has a modular structure and basically has a feed module M1, a printing module M2, a fixing module M3 and a post-processing module M4.
  • This printing device is described in WO-A-98/39691. The content of this WO publication is hereby incorporated by reference into the present specification.
  • the feeding module M1 of the printing apparatus includes the elements for feeding, e.g. from a stacker withdrawn continuous paper 10 to the printing module M2.
  • the printing module M2 contains electrophotographic printing units that support the recording medium 10, i. the paper web, print.
  • the recording medium 10 is then fixed in the fixing module M3 and cut or stacked in the post-processing module M4.
  • the printing module M2 contains the necessary for the printing of a tape-shaped recording medium 10 with toner images aggregates, which are arranged on both sides of a transport channel 11 for the recording medium 10.
  • These units consist essentially of two differently configurable electrophotography modules E1 and E2 with associated transfer modules T1 and T2.
  • the modules E1 and T1 are assigned to the front side of the recording medium 10 and the modules E2 and T2 to the back.
  • the identical constructed electrophotography modules E1 and E2 each contain a guided via deflection rollers 12, and driven by electric motor in the direction of arrow A seamless photoconductor belt 13, for example an organic photoconductor (Organic Photo Conductor, OPC).
  • OPC Organic Photo Conductor
  • the units for the electrophotographic process are arranged. They serve to produce on the photoconductor individual color separations associated toner images.
  • the moving in the direction of arrow A photoconductor is first charged by means of a charging device 14 to a voltage of about -600 V and then discharged at position 15a image information dependent with the help of a consisting of an LED comb character generator 15 to about -50 volts.
  • the photogenerated charge latent image thus formed is then toned using developer stations 16/1 to 16/5 at respective developer positions, eg at station 16/1 position 16a.
  • the image is loosened by means of the intermediate exposure device 17 and transferred at a transfer position 18a in a transfer station 18a by means of transfer rollers 18 onto a transfer belt 19 of the transfer belt module T1 by means of a transfer corona device 20.
  • the entire photoconductor belt is discharged over the entire width and cleaned by a cleaning device 22 with cleaning brush of adhering toner dust.
  • a subsequent intermediate exposure device 23 ensures a corresponding charge-conditioning of the photoconductor belt, which is then uniformly charged, as already described, with the aid of the charging device 14.
  • the developer stations are 16/1 to 16/5 switchable. They each contain the toner associated with a single color separation.
  • developer station 16/1 contains black toner, developer station 16/2 yellow toner, and developer station 16/3 toner color Magenta, the developer station 16/4 cyan color toner and, for example, the developer station 16/5 blue toner or toner of a special color.
  • developer stations both one-component and two-component toner developer stations can be used.
  • a toner image which is assigned to a single color separation, is always generated by the developer station 16/1 to 16/5, always by a single developer station.
  • This toner image is then electrostatically transferred to the transfer belt 19 of the transfer module T1 via the transfer device 18 in conjunction with the transfer corona device 20.
  • the transfer module T1 contains the transfer belt 19, which consists of polyimide or a similar substance, and is guided around a plurality of deflection devices and driven by a motor.
  • the transfer belt 19 is similar to the photoconductor belt 13 endless and formed without seam.
  • the transfer belt 19 in the transfer module T1 functions as a collector for the individual toner images associated with the color separations, which are transferred to the transfer belt 19 via the transfer device 18, 20.
  • the individual toner images are arranged one above the other so that an overall toner image corresponding to the color image is formed.
  • the transfer module T1 contains a switchable transfer station 24. This can, as shown in FIG. 1, comprise a plurality of mechanically displaceable transfer rolls 28 with associated transfer corona device 29 In the "collect" operating state, transfer rolls 28 and transfer corona 29 are shifted upward in the direction of arrow C, so that the transfer ribbon is spaced from the record carrier 10.
  • the individual toner images are taken over in this state by the electrophotography module E1 and superimposed on the transfer belt 19.
  • the cleaning station 26 is deactivated by pivoting.
  • the recording medium 10 is in this operating state in the region of the transfer station 24 at rest.
  • the electrophotography module E2 and the rear-side transfer module T2 of the recording medium 10 are constructed according to the modules E1 and T1. Again, a Sammelfarbtonersent for the back is generated on the transfer belt T2, wherein in the operating state "collecting" here, the corresponding transfer printing station 24 is pivoted.
  • the transfer belts 19 of the transfer modules T1 and T2 are brought into contact with the recording medium 10 in the area of their transfer printing stations 24 and the recording medium 10 is thereby moved.
  • the cleaning stations 26 of the transfer modules T1 and T2 are swiveled in and activated.
  • To Transfer of the two toner images on the front or the back of the recording medium 10 are adhered to the transfer belts 19 adhering toner image residues on the cleaning stations 26.
  • This is followed again by a collection cycle for the generation of new toner images, in which the transfer belts 19 are swung off and the recording medium 10 is at a standstill.
  • the transfer of toner images from the transfer modules T1 and T2 on the recording medium 10 thus takes place in the start-stop operation of the recording medium.
  • the recording medium 10 is moved in the paper transport channel 11 by means of motor-driven transport rollers 38.
  • loading or corona means 39 for paper conditioning can be arranged to allow the paper 10 to be charged prior to transfer, e.g. is set evenly.
  • the feed module M1 contains a loop puller 30.
  • This loop puller 30 acts as a tape store, buffers the record carrier 10 continuously drawn off by a stacking device 31.
  • the fixing module M3 includes an upper and lower row of infrared radiators 32 between which the paper transport channel for the record carrier 10 extends. Since there is a loose toner image both on the front side and on the rear side of the recording medium, the recording medium 10 in the area of the infrared steels 32 is contactless via a deflection roller 33 arranged on the output side free guided. The fixation takes place via the heat of the infrared radiator 32.
  • cooling elements 34 and guide rollers 35 are carried out a cooling of the recording medium 10 and a smoothing, for example via appropriate Decurler facilities.
  • cooling elements 34 may serve blower-driven air chambers.
  • a corresponding post-processing of the recording medium 10 takes place in the context of the post-processing module M4, which is e.g. may include a cutting device 36 with stacking device 37.
  • the printer has been described above in terms of the Duplex and Color print modes.
  • color images are printed on both sides of the recording medium 10 operated in the start-stop. This mode of operation is the slowest.
  • most of the time is printed in monochrome in simplex or duplex mode.
  • the recording medium 10 is continuously moved, and the transfer stations T1 and T2 are continuously in contact with the recording medium. Only one developer station of the developer module E1 or E2 is activated, which in each case generates a monochrome toner image which is transferred directly to the transfer belts 19 and from there to the recording medium 10.
  • the transfer tapes 19 work as a direct transfer element without collecting function; the cleaning stations 26 are therefore permanently activated.
  • the printing device is constructed performance-adapted. This means that it is adapted to the most common monochrome printing and especially fast due to its continuous operation. If color printing is desired, is switched to start-stop operation and the the time required depends on the number of colors contained in the color image and thus on the number of activated developer stations 16/1 to 16/5. If, for example, only two colors are printed, for example black with red in the spot color method, only two transfer processes with collection processes in the developer module E1 and in the transfer module T1 are required to display the collector toner image. The same applies to three colors, etc.
  • various other operating states can be generated in the printer. For example, colored simplex by activating the developer module and transfer module only on the corresponding desired side of the record carrier or else a mixed operation, e.g. printed on the front multi-color images and on the back monochrome images.
  • a microprocessor-controlled control device 41 coupled to the device control 40 (GS) of the printer serves to control and regulate the components of feed module M1, print module M2 and fixation module M3 or post-processing module M4 stands. Within the modules it is coupled to the individual aggregates, e.g. with the electrophotography modules E1 and E2 and the transfer modules T1 and T2.
  • a control panel 42 Connected to the device control 40 or the controller 41, which may be part of the device control, is a control panel 42 (B), via which the various operating states can be entered.
  • the control panel 42 may include a touch screen display or a personal computer (PC), such as a Siemens Nixdorf Scenic Pro M7 PC with a paired keyboard.
  • PC personal computer
  • FIG. 2 shows a device in which an endless belt 5 runs over three deflecting rollers 1, 2 and 3.
  • the first Deflection roller 1 is designed as a control or control roller and is used in addition to the deflection function to stabilize the tape.
  • the control roller 1 is attached to a rotating frame 7, which is mounted pivotably and displaceably.
  • the rotating frame 7 can be displaced in the direction D in the linear guide 8, in which the guide shaft 9 runs.
  • the guide shaft 9, which is fixedly connected to the rotating frame 7, are pivoted in the direction E.
  • the drive of the belt 5 is effected by a drive motor which acts on at least one of the rollers 1, 2 or 3.
  • the drive motor is controlled, with signals relating to the actual belt speed being generated by the brand sensor 52 being input into the control system.
  • This mark 51 is used to control the process (control of the lateral band edge to a certain position) as a trigger mark.
  • the scanning locations along the band edge are determined, starting from the trigger mark 51, by a timing controller. In principle, an arbitrarily high resolution can be achieved.
  • the tape edge scanning pulses, which correspond to an X position on the tape, are given by the signals of a timer.
  • the constant time pulses correspond to constant distances (X-position) on the belt 5.
  • X-position constant distances on the belt 5.
  • Deviations from the defined sampling location (X position) on the tape should be sufficiently small. The resulting measurement error when scanning the band edge over this timing is so negligible with sufficiently accurate synchronization of the band.
  • the sampling is synchronized with the trigger mark 51 once per belt revolution.
  • the lateral tape position perpendicular to the tape transport direction A i. a Y position
  • the passage of the trigger mark 51 is measured and thus detects the circulation time for a belt circulation.
  • the sensors 50, 52 send the signals detected by them to a microprocessor module 55.
  • This module 55 contains inter alia a pulse generator (timer) which emits signals at constant time intervals, to which the tape edge sensor 52 scans the band edge.
  • the microprocessor assembly 55 is connected via a line 58 to the device controller 40.
  • the microprocessor assembly 55 compares the measured band edge values (Y positions) and the associated X position derived from the mark sensor 50 with target value pairs (X, Y) of a data memory 56.
  • a control pulse is applied to the motor controller 57 via the microprocessor module 55 in order to actuate the servo motor 4 so that the lateral band position of the volume 5 is corrected.
  • an electromechanical scanner in which a mechanical lever under spring action at the band edge is applied and a lateral band movement via the lever acts on an electronic circuit, for example, inductive or capacitive. The lever movement then changes electronic parameters of the circuit, such as inductance or capacitance, thereby generating the sense signal.
  • an electronic circuit for example, inductive or capacitive.
  • the lever movement then changes electronic parameters of the circuit, such as inductance or capacitance, thereby generating the sense signal.
  • both the sensor 50 and the sensor 52 also optoelectronic scanner such as reflex or transmitted light barriers or CCD cameras are suitable.
  • step S1 a belt motor is turned on, which drives one of the rollers 1, 2 or 3 and the belt 5 moves in the direction A.
  • Sensor 50 monitors the tape run.
  • the microprocessor controller 55 now waits until the sensor 50 detects the trigger mark 51 on the tape 5, ie the trigger mark has arrived at the sensor 50 (step S2).
  • This position also marks the first X target value X 0.
  • the current Y position of the lateral band edge which was detected by the sensor 52 is also sampled and taken into the table 56 together with the associated X value ( Step S3).
  • the timer is started in the microprocessor 55 and the next pair of values is entered into the data memory 56 on the continuously running band after the first time interval or with the pulse emitted by the timer.
  • the X position of the tape is calculated from the time specified by the timer (frequency) and the instantaneous tape speed of the tape 5.
  • the Y value is in turn determined with tape edge sensor 52 (step S4).
  • the steps S3 and S4 are repeated until the tape circulation is completed, that is, until the trigger mark 51 has reached the sensor 50 again (step S5).
  • the value pairs of the previously scanned tape circulation must now be corrected to the effect that a lateral drift of the tape must be subtracted from the actual band contour store in the data memory 56.
  • the first and the last Y value which in each case were at the same X location, ie at the trigger mark 51 of the band 5, are used.
  • the difference between the first Y value and the last Y value corresponds to the amount that the band 5 has run sideways within the one revolution.
  • the value table (X, Y) thus obtained gives the actual shape of the. Band edge again.
  • Each defined X position of the band is thus uniquely assigned a Y setpoint via the stored table.
  • step S10 the belt motor is turned on, corresponding to step S1.
  • the microprocessor controller 55 then waits again until the trigger mark 11 has arrived at the mark sensor 50 (step S11). With the edge sensor 52, the current position of the band edge is then recorded (step S12). Then, in step S12, the difference between the currently measured Y value of the band edge and the Y value y0 stored in the memory 55 (the value belonging to the trigger mark) is formed. This difference value is input to the subsequent control process.
  • step S14 a drive value for the servo motor 4 is formed, with which the circulating belt 5 in the target position, i. to be moved in the direction of the stored Y setpoint.
  • the controller can be designed as a proportional controller, or as a proportional-integral controller.
  • step S15 in turn, the time interval specified by the timer or its pulses is waited and it is checked whether the tape is still running (step S16). If the tape is standing, the control process is ended. If the tape is still running, then it is checked whether the number of measured values for a complete tape circulation has been reached. If that is the case, then the Step S11 is executed again, ie waited until the trigger mark is reached again. If, on the other hand, it is determined in step S17 that the measured values of the belt circulation are not yet complete, step S12 is continued until the belt circulation has ended.
  • the drifting away of the band can be minimized.
  • Bumps in the scanned band edge do not affect the tracking accuracy of the tape guide. This means a substantial improvement in the tape guide accuracy over methods in which only one tape per revolution, the lateral tape position is measured and tracked, or where irregularities of the band edge are not taken into account in continuous readjustment. Since the respective shape of the band edge is stored as a reference, the edge contour can lie within rough tolerance limits and be much less accurate than the track accuracy of the band to be achieved. As a result, manufacturing costs for the tape or for a high-precision cutting of the strip edges can be saved.
  • a further advantage of the invention is that only a single tape mark is sufficient to allow a continuous or only on the timing intervals dependent sampling over the entire band circumference.
  • the sampling frequency can be easily adapted to higher or lower resolution requirements by simple changes, especially in software running in the microprocessor. With inaccurately cut band edge, the tracking accuracy can be further increased by increasing the sampling frequency.
  • FIG. 6 illustrates the principle on which an embodiment of the invention is based.
  • a band-shaped intermediate image carrier here a photoconductor belt 13, which travels along a direction A
  • a triangle mark 60 is applied on a band-shaped intermediate image carrier, here a photoconductor belt 13, which travels along a direction A.
  • the mark 60 has a first, perpendicular to the direction A edge 62, and a second, obliquely to the direction A extending edge 63.
  • the mark 60 thereby forms a triangular shape.
  • the mark 60 may be formed in the band 13 as a mechanical recess or be applied only as a fine surface structure on the tape, such structures such as laser ablation, laser coating, surface coating by vapor deposition or deposition, plasma etching, wet chemical etching or by developing a photographic Process can be applied as an optical mark.
  • a position-sensitive detector 61 is provided for evaluation of the mark 60.
  • a corresponding sensor is provided which recognizes this mark 60 on the tape 13.
  • An optical mark 60 is scanned, for example, with a photoelectric sensor, in the example of FIG. 6 with a CCD line scan camera.
  • the line camera 61 may comprise an optical device, e.g. by a lens, a lens or a fiber optic cable, with which the tape are imaged sharply on the camera sensors.
  • the line scan camera 61 is dimensioned such that it can reliably detect the mark 60 along the transport direction within an expected deviation range of the strip run. For example, it is expected that the tape Positional deviations per revolution of about one millimeter may have, the line detector must be able to detect at least one millimeter on the tape.
  • leading edge 62 of the mark 60 may be used to trigger the measurement itself, as a trigger point to determine a total revolution of the belt 13 or some other event, e.g. for determining the speed, are used.
  • the two triangle marks 60, 60a are offset from one another by the distance ⁇ x perpendicular to the direction of movement A. In the direction of movement they are offset by the distance .DELTA.y each other.
  • Dy v ⁇ .delta.t ,
  • the time interval between mutually corresponding edges of the two markers 60, 60a defines the position of the band 13 at a known band speed.
  • ⁇ denotes the pitch angle of the oblique edge.
  • FIG. 7b shows a further improved method compared to the measuring method shown in FIG. 7a.
  • the marks 60, 60a are scanned on two tracks 66, 67, which are located at a known distance d. This mathematically results in two relationships between the time lengths and the sampled intervals, from which both the tape speed and the tape position can be determined. With this method, tape position and tape speed can already be determined by evaluating a single mark.
  • both the tape position can be determined with a single sensor and a single mark as well as the tape speed be determined and used to control these two sizes.
  • the marks can also be detected at different locations along the direction of movement. This can be done in particular at the same time at different locations. For this purpose, e.g. CCD area sensors taking a snapshot. The speed deviation is then determined by the relative local deviation (vertical line image after time trigger) from a target position.
  • a device having a plurality of light-sensitive diodes (CCD line or diode array) running transversely to the direction of movement may also be used.
  • a lens can be used for scanning, with which the mark is imaged on the sensors.
  • a CCD line with high resolution transverse to the direction of movement so a plurality of parallel tracks can be recorded according to the number of diodes of the lines.
  • FIG. 8 shows different variants of suitable measuring marks. While the marks 68a, 68b have two evaluatable edges with respect to the direction of movement A, the measuring marks 69a, 69b, 70a, 70b and 71a and 71b have more than two evaluatable edges.
  • the marks 71a and 71b have, for example, 6 evaluable edges corresponding respectively to a light-dark transition along the transport direction A.
  • the marks may consist of optical, electrostatic, magnetostatic or mechanical information.
  • the timing of the lines defines a time interval between the marks on the basis of external specifications. This results in an identical time interval at the location of a sensor for each constant speed, so that a different difference can be inferred to a changing speed.
  • a difference value or ratio is defined, thereby providing a measure of the cumulative speed deviation for the time between the writing of the marks and the time between the respective deductions of the marks represents.
  • the deviations between the letter of the second mark and the proof of the first Brand are the same for both brands and also compensate each other in the evaluation.
  • a reduction of this period as far as possible (time interval between the writing of individual marks) would correspond approximately to the local distance of the detector at a given average speed. The measurement result is thus more accurate.
  • a control on a time difference zero then allows compliance with the constancy of a speed of the tape, without knowing its exact value. In order to ensure the constancy of the original speed, the sum of all determined time differences must be zero, ie on average there must be a corresponding opposite sign for each time difference, so that the speed deviations mutually compensate each other.
  • FIGS. 9 and 10 show an exemplary embodiment of a tensioning and regulating unit. As far as functionally similar components are shown there, the reference numerals of Figures 1 and 2 are taken.
  • the illustrated mechanical tension and control unit consists of three basic components, namely a clamping mechanism for tensioning the belt with a tension spring 86, the deflection or control roller 1 and a control mechanism for tilting the control roller. 1
  • This nose-like frame support 82 acts as a guide surface with a lever assembly 81 together.
  • the lever is placed over the ball bearing 84 without play on the compassionauflager 82 and a ball bearing 85 on an eccentric 80 which is driven by the motor 4, for tilting the frame 7.
  • the backlash between the lever assembly 81 and the eccentric 80 on the one hand and Frame support 82 on the other hand is achieved by a bias, which causes a fixed to the housing of the pressure device spring 83.
  • two independent guide surfaces are thus provided, namely on the one hand the surface formed by the frame support 82 on which the ball bearing 84 rolls and the bearing 8 in which the axle 9 is mounted.
  • the entire rotary frame 7 can be biased along the direction D, so that a revolving endless belt 5 is held under tension ( Figure 10).
  • the spring 86 is located in the area 95 on a device-fixed base frame 89.
  • the bias can be adjusted by means of a lever 87 or completely dissolved, for example, to replace the endless belt 5.
  • Figure 10 shows the arrangement in the installed state, wherein the lever 87 is locked in the biasing position in which the band 5 is kept under tension.
  • the tape drive is accomplished by means of the guide roller 3, which is for this purpose connected to a drive motor, not shown.
  • the axis 9 of the biasing spring 86 is provided on both sides of a guide, namely the linear guide 8 and provided in the frame 89 second linear guide 96.
  • the setting position of the motor 4 or the eccentric disk 80 was transmitted to the guide surface 82 via the lever arm 81.
  • the eccentric disk 80 would slide on the guide surface 82.
  • the two surfaces of the eccentric disc 80 and the guide surface 82 are coordinated so that only a small coefficient of friction acts between them.
  • FIG. 11 shows a mechanical scanner 52 for measuring the lateral band position.
  • a mechanically resistant, coated with a hard ceramic surface scanning head 90 is fixed, along which the lateral band edge along.
  • Other, low-wear materials such as hard metals or glass can be used for coating or use of the scanning head.
  • a magnet 91 is mounted, which cooperates with a Hall sensor 92.
  • a shift of the lateral band position causes a Lever movement and thus a signal in the Hall sensor 92. This signal is delivered to the microprocessor module 55, which regulates the lateral band position.
  • FIG. 12 shows again schematically a sensor 52 analogous to FIG. 11 and its function.
  • the scanned tape here again an OPC tape 13
  • This notch-shaped brand 99 is compared with the not punched in the lateral band edge mark 52 of Figure 2 achieved the advantage that with one and the same measuring device 52 can be carried out both the detection of the mark for determining the tape position in the transport direction A and the detection of the lateral position of the band contour.
  • a sensor (51) can be saved compared to the arrangement according to FIG.
  • the lever 97 consists of a leaf spring which is mounted on a holder 100 and slightly biased relative to the band edge 98, which scans the contour of the band 13 along the direction G or follows its lateral drift movement in the direction G.
  • the permanent magnet 91 On the leaf spring 97 is the permanent magnet 91, which thus follows the movement of the band edge.
  • the position of the magnet 91 is detected by the analogue Hall sensor 92 and its output signal is used as an input for the control. If a Hall sensor with built-in amplifier is used, additional electronics can be dispensed with.
  • the magnet 91 Since the magnet 91 is brought in the axial direction of the Hall sensor 92, there is a characteristic of the sensor as a function of the distance between the sensor 92 and magnet 91, which qualitatively corresponds to the 1 / x function. This characteristic is shown in FIG. Consequently, the sensor 52 becomes the more sensitive, the smaller the distance between the Hall sensor 92 and magnet 91 is. Thereby, the sensitivity of the sensor 52 can be varied by the position of the operating point of the control. The sensitivity at the operating point K p is thus higher than at the operating point L p . In the vicinity of the operating points, ie in the respective working range K or L, the characteristic curve can be regarded as linear. Should this property not be desired with a large magnet moving in the lateral direction or with two magnets achieving a linear characteristic.
  • the stiffness of the spring 97 is adapted to the mass of the spring and the magnet and the stiffness of the band edge so that vibrations are largely avoided. Remaining natural oscillations of the spring, excited by the deflection of the band edge, can be further reduced by a low-pass filtering of the measuring signal or by mechanical damping elements.
  • a guide can be achieved in particular in that the sensor is mounted in an area in which the band already has a higher stability. This is the case, for example, in the area of drive or deflection rolls, since here the strip is stabilized by the curvature around the roll. For this purpose, provision is made in particular for the band to protrude laterally beyond the edge of the roll in the sensor region.
  • a capacitive or inductive path, or angle sensor could be used for detecting the lever position and thus the lateral belt position.
  • the invention has been described with a web-shaped recording medium, it can just as well be used for printing or copying machines which have band-shaped intermediate image carriers which ultimately print information on individual sheets.
  • sensors which are based on other physical effects, for example capacitive or inductive sensors, as long as the corresponding features (marks) to be detected are correspondingly detectably matched.
  • the marks may be recessed and produce a different capacitance in the sensor than the material surrounding the mark of a tape.
  • the electronic methods according to the invention can be implemented in a computer-controlled system by software technology or hardware, in particular in the form of a computer program element.
  • photoconductive belt and transfer belt are interchangeable in many aspects of the present invention.
  • the invention is not only suitable for regulating the lateral position of a photoconductor belt or transfer belt, but can in principle be used for any band-shaped intermediate image carrier.
  • the lateral position of a belt suitable for magnetography or of a transfer belt, as described in FIG. 1 can thus also be regulated.
  • the image formation on the transfer belt takes place at the connection point to the photoconductor belt and the image output in the transfer area to the recording medium (paper).

Claims (15)

  1. Procédé permettant de régler la position latérale d'un support d'images intermédiaire (13, 19) en forme de bande dans un appareil électrographique, qui est déplacé le long d'une direction de transport (A) à partir d'une position de production d'images (15a, 16a), où une image est produite sur celui-ci, jusqu'à une position de' report (18a), où il délivre les informations correspondant à l'image, moyennant quoi :
    (a) sur le support d'images intermédiaire (13, 19), un repère (51, 60) est détecté régulièrement avec un capteur (52)qui est fixe par rapport à l'appareil,
    (b) on détecte, selon une corrélation temporelle avec la détection du repère (51, 60), la situation du support d'images intermédiaire (13, 19) transversalement à la direction de transport (A),
    (c)on réalise entre les détections régulières du repère (51, 60), des mesures intermédiaires temporisées de la situation du support d'images intermédiaire (13, 19),
    (d) les valeurs de situation détectées du support d'images intermédiaire (13, 19) sont respectivement comparées à des valeurs de position théoriques enregistrées ou calculées, et
    (e) les valeurs comparatives sont utilisées afin d'activer des moyens correcteurs de position (1, 4, 6), grâce auxquels la situation du support d'images intermédiaire (13, 19) peut être modifiée transversalement à la direction de transport (A),
    (f) moyennant quoi, afin de déterminer les valeurs de position théoriques (X, Y), lors d'une opération de mesure, sur un déroulement complet de la bande, plusieurs valeurs de position du bord latéral de la bande sont enregistrées, moyennant quoi la première position est détectée une première fois au début du déroulement de la bande et une deuxième fois à la fin du déroulement de la bande, on calcule la différence entre les deux valeurs de mesure de la première position, et à partir de cela, on établit diverses valeurs correctrices permettant de déterminer l'évolution effective du bord de la bande,
    (g) et les valeurs correctrices pour les positions restantes du bord de la bande sont déterminées par une régression linéaire découlant de la différence entre les deux valeurs de mesure de la première position et des écarts de position dans la direction de transport de la bande.
  2. Procédé selon la revendication 1, dans lequel le support d'images intermédiaire (13, 19) est une bande continue, et le repère (51, 60) est enregistré seulement une fois pour un déroulement de la bande continue.
  3. Procédé selon la revendication 1 ou 2, dans lequel, afin de temporiser les mesures intermédiaires, des signaux d'horloge sont produits.
  4. Procédé selon la revendication 3, dans lequel la fréquence d'horloge des signaux d'horloge est choisie parmi une pluralité de fréquences.
  5. Procédé selon la revendication 1, dans lequel le repère (51, 60) présente un premier bord (62), qui est sensiblement perpendiculaire à la direction de transport (A) du support d'images intermédiaire (13, 19), et un second bord (63) qui est incliné par rapport au premier bord (62).
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le support d'images intermédiaire (13, 19) est transporté à une vitesse constante.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel le support d'images intermédiaire (13, 19) est un photoconducteur.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel les moyens correcteurs de position (1, 4, 6) comportent un cylindre (1) pouvant basculer, qui sert de cylindre déflecteur pour le support d'images intermédiaire (13, 19).
  9. Procédé selon la revendication 8, dans lequel, sur la base des valeurs comparatives, un moteur (4) est activé, lequel provoque un basculement du cylindre (8).
  10. Dispositif permettant de mettre en oeuvre le procédé selon l'une quelconque des revendications 1 à 9, afin de régler la position latérale d'un support d'images intermédiaire (13, 19) en forme de bande dans un appareil électrographique, qui se déplace le long d'une direction de transport (A) à partir d'une position de production d'images (15a, 16a), où une image est produite sur celui-ci, jusqu'à une position de report (18a), où il délivre les informations correspondant à l'image, moyennant quoi des moyens sont prévus, grâce auxquels :
    (a) sur le support d'images intermédiaire (13, 19), un repère (51, 60) est détecté régulièrement à l'aide d'un capteur (52) qui est fixe par rapport à l'appareil,
    (b) selon une corrélation temporelle avec la détection du repère (51, 60), la position du support d'images intermédiaire (13, 19) est détectée transversalement à la direction de transport (A),
    (c) entre les détections régulières du repère (51, 60), des mesures intermédiaires temporisées de la situation du support d'images intermédiaire (13, 19) sont réalisées,
    (d) les valeurs de situation détectées du support d'images intermédiaire (13, 19) sont respectivement comparées à des valeurs de position théoriques enregistrées ou calculées, et
    (e) les valeurs comparatives sont utilisées afin d'activer des moyens correcteurs de position (1, 4, 6), grâce auxquels la situation du support d'images intermédiaire (13, 19) peut être modifiée transversalement à la direction de transport (A),
    (f) afin de déterminer les valeurs de position théoriques (X, Y) lors d'une opération de mesure, sur un déroulement complet de la bande, plusieurs valeurs de position du bord latéral de la bande sont enregistrées, moyennant quoi la première position est détectée une première fois au début du déroulement de la bande et une deuxième fois à la fin du déroulement de la bande, la différence entre les deux valeurs de mesure de la première position est calculée, et à partir de cela, on établit alors des valeurs correctrices permettant de déterminer l'évolution effective du bord de la bande,
    (g) et les valeurs correctrices pour les autres positions du bord de la bande sont déterminées par une régression linéaire découlant de la différence entre les deux valeurs de mesure de la première position et des écarts de position dans la direction de transport de la bande,
    (h) le support d'images intermédiaire (5, 13) étant guidé par l'intermédiaire d'un cylindre déflecteur (1, 12, 25, 27) maintenu dans un châssis (7), lequel peut se déplacer de manière linéaire le long d'une direction (D) et peut pivoter autour d'un axe (9) sensiblement parallèle à la direction de déplacement linéaire (D) afin de régler la position latérale de la bande, un premier moyen de guidage (8) étant prévu pour le déplacement linéaire et un deuxième moyen de guidage (6, 80, 81, 82, 84, 85) étant prévu pour le déplacement pivotant.
  11. Dispositif selon la revendication 10, dans lequel le deuxième moyen de guidage présente une surface de guidage (82) rigidement solidaire du châssis (7), sur laquelle roule sans jeu un élément de soutien (83).
  12. Dispositif selon la revendication 11, dans lequel le châssis (7) est précontraint grâce à un ressort (83) contre la bascule (81).
  13. Dispositif selon l'une quelconque des revendications 10 à 12, dans lequel la position du bord latéral (98) du support d'images intermédiaire (5, 13) est détectée à l'aide d'un capteur d'exploration mécanique (52), dans lequel un levier (97) doté d'un aimant permanent (91) repose sur le bord de la bande (98) sous l'effet de la précontrainte, et dont les signaux de mesure sont produits par un capteur à effet Hall (92).
  14. Dispositif selon l'une quelconque des revendications 10 à 12, dans lequel, en tant que repère (51, 60), sur le support d'images intermédiaire (5, 13), on détecte une entaille (99) pratiquée par estampage dans le bord latéral de la bande (98).
  15. Imprimante ou photocopieuse électrographique comportant un dispositif selon l'une quelconque des revendications 10 à 14.
EP00958339A 1999-08-10 2000-08-10 Procede et commande pour la regulation de position d'un support d'image en forme de bande dans un appareil electrographique Expired - Lifetime EP1203269B1 (fr)

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DE19937776 1999-08-10
DE19937776 1999-08-10
PCT/EP2000/007403 WO2001011432A1 (fr) 1999-08-10 2000-08-10 Procede et commande pour la regulation de position d'un support d'image en forme de bande dans un appareil electrographique

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US6721528B1 (en) 2004-04-13
DE50014185D1 (de) 2007-05-03

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