EP1561152B1 - Verfahren und vorrichtung zum steuern eines elektrografischen druckers oder kopierers - Google Patents

Verfahren und vorrichtung zum steuern eines elektrografischen druckers oder kopierers Download PDF

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Publication number
EP1561152B1
EP1561152B1 EP03785627A EP03785627A EP1561152B1 EP 1561152 B1 EP1561152 B1 EP 1561152B1 EP 03785627 A EP03785627 A EP 03785627A EP 03785627 A EP03785627 A EP 03785627A EP 1561152 B1 EP1561152 B1 EP 1561152B1
Authority
EP
European Patent Office
Prior art keywords
time
single sheet
printer
sheet
copier
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 - Fee Related
Application number
EP03785627A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1561152A2 (de
Inventor
Robert Heimbach
Rainer Katterloher
Stephan Pilsl
Stefan Zimprich
Christian Fertl
Werner Zollner
Christoph Nemmaier
Helmut Sippel
Hubert Drexler
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 EP1561152A2 publication Critical patent/EP1561152A2/de
Application granted granted Critical
Publication of EP1561152B1 publication Critical patent/EP1561152B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
    • G03G15/6558—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point
    • G03G15/6561—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point for sheet registration
    • G03G15/6564—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point for sheet registration with correct timing of sheet feeding
    • 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
    • G03G2215/00599—Timing, synchronisation

Definitions

  • the invention relates to methods and apparatus for controlling an electrographic printer or copier and to an electrographic printer or copier.
  • Known electrographic printers and copiers contain several sensors for monitoring the paper path, such as e.g. Photocells and switches. Furthermore, these known printers include a plurality of actuators, e.g. Stellmotore, stepping motors, valves and solenoids, wherein at least some actuators the actuating position of the actuator is monitored by means of a position feedback.
  • the paper path of a single sheet to be printed by the printer is controlled by means of the actuators and monitored by means of the sensors. Furthermore, the sensors are used to control between sheets to be printed single sheets sheet spacing and to determine Steuerzeitpuhkte.
  • At least one light barrier is arranged immediately in front of a printing unit to start the printing process of the printing unit when the leading edge of the sheet has reached the light barrier. This is to ensure that the printed image is correctly transferred to the supplied side of the single sheet.
  • known printers monitor how long a sensor signal triggered by a page present in the sensor area is present. If this time exceeds a predetermined limit, it is assumed that the paper jams in the region of the sensor. Further, in known printers or copiers, the time taken for a single sheet to pass after passing a first sensor until arriving at a second sensor is detected. If this time exceeds a preset limit, it is assumed that the cut sheet is still in the area between the two sensors and a paper jam has occurred.
  • the actuators are controlled in known printers and copiers according to a control scheme depending on sensor signals.
  • a predetermined pitch For adjusting the sheet pitch, the sheet pitch between two cut sheets is measured, and in the case of a deviation from a preset sheet pitch depending on the deviation, the sheet pitch for subsequent cut sheets is controlled.
  • These known printers or copiers thus require a multiplicity of relative time timings which interfere with the individual control processes and are provided by the controllers of the assemblies of the printer or copier.
  • a large number of sensors and actuators are required to ensure both the high printing speed and high print quality.
  • Such known high-performance printers are, for example, in the International Patent Application WO 98/18054 and WO 98/18052 describing a high-performance printer with two printing units for printing single sheets is known.
  • the inscription area during the interview on NEN printers can be operated in at least two modes, the conveying path of the single sheet is determined by the Drukker by the mode.
  • the printers have a variety of sensors and actuators to control the paper transport and printing process.
  • the object of the invention is to provide a central control for the paper feed in a printer or copier, with the complex control operations are relatively simple and can be realized with high accuracy.
  • the desired point in time at or to which at least one sensor signal is expected, can already be determined before the control process for transporting the single sheet through the printer or copier is started.
  • the control units of the printer or copier must therefore no longer determine desired times during the control process. If the desired point in time is monitored by means of a separate time control, then the remaining controls of the printer or copier can be substantially relieved from monitoring the desired times. It is advantageous to refer the target time to a time standard of the printer or copier, for example to the system time. As a result, reaching or exceeding the desired point in time can be monitored simply and with little effort.
  • a second aspect of the invention relates to an apparatus for controlling an electrographic printer or copier which determines sheet-fed information from the print data supplied to the printer or copier.
  • the controller determines the conveying path of the single sheet by the printer or the copier for producing at least one printed image on at least one side of the single sheet.
  • the controller determines at least one desired point in time at which at least one sensor signal is to be expected and / or at least one actuator is to be triggered.
  • the target time is related to a time standard of the printer or copier.
  • the target times can be determined before the control of the transport of the single sheet by the Drukker or copier, whereby the controller or the controls of the printer or copier during the actual control process set or monitor the target times and is relieved thereby.
  • the target time is based on a time standard, for example, on the system time, the printer or copier, the target point in time can be easily monitored by means of a timer.
  • the control of the printer or copier for controlling the single sheet along the conveying path is thus relieved of the determination and monitoring of the target point in time.
  • the determination and monitoring of the desired time requires considerable resources of the controller.
  • the control is relieved, at least during the control process, since the desired time does not have to be determined during the control process, but can be determined before feeding the single sheet.
  • the printer control is thus also from monitoring the target time relieved.
  • the time control unit then outputs a signal to the printer controller when it reaches and / or when the desired time is exceeded.
  • a method of controlling an electrographic printer or copier In a first operating mode for double-sided printing of a first single sheet, a printed image on the front side of the first single sheet and with the aid of a second printing unit a printed image on the back of the first single sheet is produced by means of a first printing unit. The single sheet is fed on a first conveying path to the first printing unit and the second printing unit. In a second mode for single-sided printing of single sheets of a print image on the front of a second single sheet using a second printing unit, a printed image is generated on the front side of a third single sheet using the first printing unit.
  • the second single sheet is fed to the second printing unit on a second conveying path to the first printing unit and the third single sheet on a third conveying path.
  • the method alternates from the first mode to the second mode when a certain number of consecutive cut sheets are reached or exceeded which are to be printed on one side. This ensures that even single-sided sheets to be printed in the first mode are printed when the printing of these single sheets in the second mode including switching takes more time than the one-sided printing of these single sheets in the first mode.
  • the performance of the printer or copier can thus be increased, whereby the wear of components loaded when changing the operating modes is reduced.
  • a fourth aspect of the invention relates to an electrophotographic printer or copier which, in a first operating mode for double-sided printing of a first single sheet by means of a first printing unit on a printed image the front of the first single sheet and with the help of a second printing unit produces a printed image on the back of the first single sheet.
  • the single sheet is fed to the first and the second printing unit on a first conveying path.
  • a second mode for single-sided printing of single sheets a printed image on the front side of a second single sheet and with the help of the second printing unit, a printed image is generated on the front side of a third single sheet using the first printing unit.
  • the second single sheet is fed to the second printing unit on a second conveying path to the first printing unit and the third single sheet on a third conveying path.
  • the printer only changes from the first to the second operating mode with the aid of a controller, if a preset number of successive single sheets are to be printed on one side.
  • the printing speed of the printer or copier can be increased if the time for switching from the first mode to the second mode, printing the single-sided sheets in the second mode and switching from the second to the first mode requires more time , as the one-sided printing of the single-sided sheets to be printed in the first mode. This can increase the performance of the printer or copier.
  • a method for controlling an electrographic printer or copier in which single sheets are printed by at least one printing unit.
  • the individual sheets are conveyed on at least one conveying path through the printer or copier and fed to the printing unit.
  • the arrival time of a first individual sheet at a first measuring point is determined as the first actual time and compared with a first desired time.
  • the conveying speed of the first single sheet is increased, reduced or maintained at least over part of the conveying path.
  • the arrival time of a second individual sheet at the measuring point is determined as a second actual time and compared with a second desired time.
  • the conveying speed of the second individual sheet is increased, reduced or maintained at least over part of the conveying path. This ensures that the distance between the first and the second single sheet can be set exactly. As a result, even very small blade pitches can be set exactly, which increases the printing speed of the printer or copier and improves the accuracy in producing the printed images.
  • an apparatus for controlling an electrographic printer or copier wherein the time of arrival of a first sheet conveyed by a conveyor at a measuring point is determined as a first actual time by a measuring device.
  • a control unit compares the first actual time with a first desired time and controls the conveying speed of the first single sheet in an area after the measuring point.
  • the control unit increases, decreases or retains the conveying speed of the first individual sheet at least over part of the range, depending on the deviation of the first actual time from the first setpoint time.
  • the measuring device determines the arrival time of a second conveyed by the conveyor sheet at the measuring point as the second actual time.
  • the control unit compares the second actual time with a second desired time and controls the conveying speed of the second single sheet in an area after the measuring point.
  • the control unit at least increases, reduces or retains the conveying speed of the second single sheet a portion of the range, depending on the deviation of the second actual time from the second target time. This ensures that the blade spacing between the first and the second single sheet is set exactly and very small blade clearances can be set accurately.
  • the ability to set such small sheet pitches can increase the printing speed of the printer or copier.
  • an exact positioning of the printed image on the single sheet is easily possible by the exact positioning of the first and second sides. Thus, the performance of the printer or copier is increased and the print quality is improved.
  • FIG. 1 is a feeder unit of a high-performance printer with a printing speed of up to 160 sheets DIN A4 per minute shown.
  • the feeder unit has four storage compartments su_A, su_B, su_C, su_D, from which individual sheets can be removed.
  • the feed unit can be fed from a subordinate feed unit, not shown, single sheets in the direction of arrow P1. These fed single sheets are conveyed with the help of the roller pairs WP13, WP12, WP11, WP10 up to the light barrier LS9. Subsequently, the single sheet is conveyed by means of the pair of rollers WP9 in the direction of the arrow P2 in the printer, not shown.
  • the roller pairs WP9 to WP13 are driven by a stepping motor SM9, so that the cut sheet is conveyed through the feed unit at a constant speed V TR .
  • the storage compartments suction belt SB_A to SB_D of the storage compartment suction belt SB_A to SB_D each contain a conveyor system, which raises the stack in the respective storage individual sheets so that the top sheet of the respective stack is arranged at a predetermined height below the suction belt SB_A to SB_D of the storage compartment suction belt SB_A to SB_D.
  • the suction belt SB_A is driven by means of the stepping motor SM1B, so that the uppermost single sheet is fed to the pair of rollers WP1, wherein the suction belt SB_A accelerates the single sheet to a conveying speed V INPUT .
  • the single sheet is cut with the help of the pair of rolls WP1 with the speed V INPUT transported.
  • the time of arrival of the single sheet at the light barrier LS1 is detected and compared with a previously set for this sheet and this light barrier LS1 target time.
  • the conveying speed of the single sheet is reduced from the feed speed V INPUT to the transport speed V TR .
  • the single sheet is conveyed to the light barrier LS5, this detects the arrival time of the single sheet and compares the arrival time again with a second target time.
  • the drive speed of the driven by the stepping motor SM1A roller pair WP5 is maintained at conformity of the arrival time point with the desired point in time to transport speed V TR, for a period up to a speed accelerated larger V TR or reduced TR for a period up to a speed less than V , After this period with increased or reduced speed, the single sheet is transported at transport speed V TR on.
  • the cut sheet is fed to the pair of rollers WP6 driven by the stepping motor SM9 and the pair of rollers WP7 driven by the stepping motor SM2A, conveyed therefrom at the conveying speed V TR and monitored by the light barrier LS6, LS7 arranged in front of the respective pair of rollers WP6, WP7.
  • This monitoring is used in particular for detecting paper path errors, such as paper jams.
  • the storage compartment suction belt SB_B which is driven by the stepper motor SM2B, the Single sheet in the same way as described in connection with storage compartment suction belt SB_A, taken and accelerated to the feed speed V INPUT .
  • the pair of rollers WP2 driven by the stepping motor SM2A further feeds the single sheet at the speed V INPUT , whereby the arrival time of the cut sheet is detected at the light barrier LS2 downstream of the pair of rolls WP2 and with a setpoint determined beforehand for a light barrier LS2 and the cut sheet by a main controller. Time compared.
  • the time is determined at which the conveying speed of the single sheet is reduced from the drawing speed V INPUT to the conveying speed V TR .
  • the speed reduction is performed by a speed change of the stepping motor SM2A.
  • the drive speed of the roller pair WP7 is simultaneously reduced to the speed V TR .
  • the time of arrival of the single sheet taken from the storage compartment su_B is detected and compared with a further setpoint time predetermined previously for the light barrier LS7 and the single sheet. Depending on the comparison result, the conveying speed V TR of the single sheet is maintained, the conveying speed is increased or reduced for a determined period.
  • the removed from the storage compartment su_B single sheet is thus using the roller pair WP2 and the roller pair WP7 and using the light barriers LS2 and LS7 a time-dependent control of the delivery position of the removed single sheet so that it at a predetermined target time of the light barrier LS9, the is designed as a transfer light barrier to the printer arrives.
  • the uppermost single sheet of the storage compartment suction belt SB_C is also removed therefrom by means of a suction belt SB_C and accelerated to the intake speed V INPUT .
  • the suction belt SB_C is driven by means of a stepper motor SM3B.
  • the arrival time at the light barrier LS3 is compared with a previously determined by a control unit of the intake unit, target time. Depending on the comparison result, the control unit determines the time at which the roller pair WP3 reduces the pull- in speed V INPUT to the conveyor speed V TR . This ensures that the removed from the storage compartment gar_C single sheet arrives at the light barrier LS9 at a predetermined desired time.
  • the uppermost single sheet arranged in the storage compartment su_D is accelerated to the pull-in speed V INPUT with the aid of the suction belt SB_D and fed to the roller pair WP4.
  • the suction belt SB_D is using the stepper motor SM4B.
  • the pair of rollers WP4 is driven by the stepping motor SM4A.
  • the arrival time of the removed from the storage compartment für_D cut sheet at the light barrier LS4 is detected and, as already described in connection with the storage compartment su_C, depending on the comparison result of the arrival time with a predetermined target time of the time set at which the feed rate V INPUT using of the roller pair WP4 is reduced to conveying speed V TR .
  • the removed from the storage compartment suction-D single sheet of the light barrier LS8 is supplied, which monitors the correct paper run.
  • the single sheet is fed through the pair of rollers WP8 on to the light barrier LS9.
  • the pair of rollers WP8 is driven by the stepping motor SM9, whereby the cut sheet is fed by the pair of rollers WP8 at the constant conveying speed V TR on the paper path to the printer.
  • the individual sheets fed in the direction of the arrow P1 can also be read by an external preprocessing unit, e.g. be supplied to another printer, a stamping unit or a cutting unit.
  • an external preprocessing unit e.g. be supplied to another printer, a stamping unit or a cutting unit.
  • the individual sheets removed from the storage compartments su_A, su_B, su_C, su_D are positioned with the aid of the stepping motors SM1A, SM2A, SM3A and SM4A, so that they each arrive at the photocell LS9 at a preset time of arrival. This positioning is dependent on previously specified target times at photocells, which are used to control or to control the cut sheet adjustment.
  • These photoelectric sensors determine the actual time, which is then compared with a predetermined target time.
  • the time at which the pull- in speed V INPUT is reduced to the conveyor speed V TR is then determined.
  • the time of arrival is defined as the point in time at which a predetermined edge of the sheet, for example the sheet leading edge in the conveying direction, of the single sheet is used. Due to the fact that after the respective storage compartment downstream roller pair until the transfer of the single sheet to the printer in the direction of arrow P2 no or only a very small slip occurs, only the positional deviations that occur during removal of the single sheet from the respective storage compartment, be taken into account in the sheet adjustment in the feeder unit.
  • This sheet adjustment according to the invention makes it possible to specify further target times of the single sheet in the printer arranged below exactly and to use for the entire printer control, since the transfer times of the single sheets are maintained to the printer very accurately by the feed unit 10.
  • the differently long paper paths of the individual sheets from the various storage compartments su_A, su_B, su_C, su_D to the light barrier LS9 are taken into account when determining the desired time points.
  • the sheet distances are controlled and regulated with the help of the target times with high precision.
  • FIG. 2 shows a block diagram with control units of the printer.
  • sheet-fed information is determined from a print data stream. Like elements have the same reference numerals.
  • This sheet-fed information is transferred to a main controller 44 via an HSCX bus 43.
  • This information includes the so-called page registrations for pages to be printed and single sheets to be printed.
  • the main controller 44 converts this information into control data.
  • This control data is supplied to the main controller 44 by means of a second HSCX bus system 46 subordinate controls 48 to 58.
  • the slave controllers 48-58 each have a timer unit with a 32-bit counter as the timer, with all the timer units of the printer being synchronized and clocked using the same clock signal.
  • the clock signal is generated by the main controller 44 and transmitted via a clock signal line to the timers of the control units 48 to 58.
  • the control data generated by the main controller 44 for the subordinate controllers 48 to 58 includes the page number of the page to be printed, the paper size, especially the paper length and the paper width, the tray tray A to tray_D from which the single sheet to be printed is taken out and the storage compartment in which the printed single sheet is stored, the operating mode in which the single sheet is printed and a minimum sheet spacing to a subsequently to be printed single sheet.
  • the minimum distance to the next sheet to be printed is determined depending on the operating mode in which the current sheet is printed or printed.
  • a duplex mode in which a single sheet the first printing unit is supplied for printing on the front side and subsequently the second printing unit for printing on the back side
  • a highlight color mode in which the first printing unit a print image in a first color on the front side of the single sheet and the second printing unit below a second printed image prints in a second color on the front side, as well as a highlight color duplex mode provided, in each case on the front and on the back of a print image in the first color using the first printing unit and a second print image in a second Color is generated by the second printing unit.
  • the respective control unit 48 to 58 determines, from the control data transmitted from the main controller 44, by means of a management module contained in the respective control unit 48 to 58, target time points which relate to a system time of the printer which is determined by means of a timer of a real time timer. Assembly of the respective control unit 48 to 58 is formed.
  • the real-time subassembly of the control unit 52 is designated 68 and the management subassembly of the control unit 52 is designated 66.
  • the real-time module 68 is a timing unit for monitoring target timings.
  • the target times are set so that the smallest possible sheet spacing for the operating mode between successive individual sheets to be printed, whereby a maximum printing speed is achieved.
  • the target times contain, as already for FIG.
  • the synchronization of the timers of the control units 44, 48 to 50 is initiated by the main controller 44.
  • the timers include a 32-bit counter, with all counters counting the clock pulses of the same 100 kHz clock signal generated by the main controller 44.
  • the control unit 48 determines, from the control data of the main controller 44 by means of a management board, target timings concerning the paper discharge control.
  • a management unit of the control unit 50 determines target timings pertaining to a printing unit, a management unit of the control unit 52, target timings concerning the paper input, a management unit of the control unit 54 target timings of the printing unit DW1, a management unit of the control unit 56 target timings, which relate to the printing unit DW2, and a management unit of the control unit 58 target times that relate to the character generator.
  • the control units 48 to 58 are provided with sensors (not shown), such as e.g. LS1 to LS13, S1 to S13 and connected to actuators SM1A, SM1B to SM9, which are evaluated or controlled by the control units 48 to 58.
  • the stepper motors SM1A, SM1B to SM9 are controlled via stepper motor drive units 60, 62, 64, which are connected to the respective controller 48, 50, 52 by means of a CAN bus system.
  • FIG. 3 is shown a block diagram with an arrangement for monitoring target points in time and setting of control times for actuators.
  • the main controller 44 transmits a clock signal of 100 kHz as well as control data to the management board 66 of the paper input control unit 52.
  • the managing board 66 determines the target timings as 32-bit count values as already described. These counts refer to the count of the timer of the real-time module 68.
  • information about the control process to be executed when the count value is reached is determined. If a target timing concerns a stepper motor driving unit 64 connected to the control unit, a target timing is transmitted to this stepping motor driving unit 64 and monitored by a timing unit of the stepping motor driving unit 64. This timing unit is also supplied with the clock signal to the main controller 44.
  • the target times are managed by means of a memory management, not shown, such that they are sorted in the management module 66 according to the time sequence of the desired times.
  • the desired time which is reached next in time is transmitted to a time control unit 68 together with the associated control information.
  • the timing unit 68 compares the target time with the current time by comparing the count of the target time with the actual value of the counter of the timer. When the count of the timer reaches or exceeds the value of the target time, the timer 68 initiates an interrupt and calls an interrupt service routine.
  • a preset interrupt is selected in accordance with the control information.
  • the control unit 52 performs the intended control action of the actuators or the monitoring of the sensors.
  • the control unit 52 is relieved of the monitoring of the desired times.
  • the interrupt-controlled call of the control action ensures that the control operation is carried out by the control unit 52 immediately after reaching the desired point in time, for example with the aid of an evaluation and control unit of the control unit 52, not shown, the light barriers monitors and controls valves.
  • FIG. 4 is a block diagram with elements for controlling the stepper motors for removing a single sheet from the storage compartments su_A to autism_D shown.
  • Each storage compartment contains two stepping motors, with a separate instance being provided for driving each stepping motor.
  • a control entity 14 and for controlling the stepping motor SM1A a control entity 16 are provided.
  • a control entity 18 for controlling the stepper motors of the storage compartment su_B, the control entity 20 and for driving the stepper motors of the storage compartment su_D, the control entity 22 is provided.
  • a control entity 12 which determines control times for driving the stepping motors SM1A, SM1B for the storage compartment su_A and control times for the stepping motors of the further storage compartments from control data which are supplied to the control unit 12 from the main module 44.
  • the control entity 12 is, for example, as management assembly 66 of the control unit 52 according to FIG. 2 executed.
  • the control entity 12, the control entity 14, the control entity 16 and the control entities 18, 20, 22 each contain a timing control unit to which a 100 kHz clock signal generated by the main controller 44 is supplied.
  • the timing units include a 32-bit counter, wherein the counts of the 32-bit counters of the timing units are synchronized by the main controller 44, so that all counters have the same count as a timer.
  • the control unit 12 determines from the control data, as already mentioned, control times of the stepper motors to be controlled and transmits these as a 32-bit setpoint value to the control instances 14, 16, 18, 20, 22.
  • the control authorities 14 to 22 monitor the respectively transmitted desired times and execute a control action when the desired time is reached. With the aid of the setpoint times, for example, a stepper motor is switched on, switched off or a ramp function for speed change is started.
  • the control instances 14 to 22 are, for example, as stepping motor controller 64 after FIG. 2 executed.
  • the control unit 14 controls the stepper motor SM1B and monitors a start time for the sheet feeding.
  • the control unit 16 accelerates the fed-in cut sheet to the pull-in speed V INPUT and with the aid of time differences, starts a time at which the pull-in speed V INPUT is reduced in a ramped fashion to the transport speed V TR . At this time, the control unit 16 then starts a ramp function, whereby the feed speed of the cut sheet is reduced evenly to transport speed.
  • the control entities 14 and 16 monitor the start timings of the respective stepping motors SM1B, SM1A.
  • the instances such as the control entity 12, the control instances 14 to 22 and other control, regulation and collection instances can, for example, be processed as separate processes by a control unit of the printer or copier, eg in multitasking operation or in multiprocessor operation.
  • a control unit of the printer or copier eg in multitasking operation or in multiprocessor operation.
  • at least partially identical program parts are used for the control entity 14 to 22, which of a higher-level program with different parameters called and processed in parallel.
  • FIG. 5 is a diagram for controlling the sheet feeder of a single sheet X from the storage compartment su_A shown.
  • the control entity 12 transmits to the control entity 14 the start time for the insertion of a single sheet X from the bin su_A as a 32-bit count.
  • the control unit 14 continuously compares the counted start timing T21 with the current count value of the timer.
  • the control unit 14 starts the stepping motor SM1B for driving the suction belt SB_A in such a way that the uppermost part in the storage compartment suction belt SB_A is accelerated uniformly up to the pull-in speed V INPUT .
  • the pull-in speed V INPUT is reached.
  • the control unit 16 controls the stepping motor SM1A to drive the pair of rollers WP1.
  • the suction belt SB_A feeds the single sheet X at the feed speed V INPUT to the main roller pair WP1, which transports the single sheet X at the feed speed V INPUT.
  • the leading edge of the cut sheet X reaches the light barrier LS1.
  • This arrival time T23.1 is detected and compared with a previously transmitted by the control entity 12 of the control entity 16 desired time. If the arrival time T23.1 coincides with the target time, the retraction speed V INPUT is maintained by the pair of rollers WP1 until the time T23.2 (nominal time), from which the speed is reduced evenly to the transport speed V TR .
  • time of arrival T23.1 of the individual sheet X at the light barrier LS1 is smaller than the setpoint time, ie if the leading edge of the cut sheet X arrives too early at the light barrier LS1, a time before the time T23.2 is determined depending on the amount of deviation, to which the intake speed V INPUT is reduced to transport speed V TR becomes. This time can be as soon as possible the time T23.1.
  • a time for reducing the pull-in speed V INPUT to the transport speed V TR is determined, which lies after the setpoint time T23.2.
  • the time for reducing the pull-in speed V INPUT to the transport speed V TR is also referred to as the ramp-down time.
  • the latest possible Abrampzeittician is the time T23.3, in which case the uniform reduction of the feed rate V INPUT to transport speed V TR is completed at time T24, at which the leading edge of the cut sheet X reaches the pair of rollers WP5.
  • the arrival time of the cut sheet X is detected at the light barrier LS5 and compared with another target time. If there is a deviation of the arrival time from the desired point in time, a further correction is achieved by a temporary change in the speed of the single sheet X with the aid of the pair of rollers WP5, so that the single sheet X arrives at the light barrier LS9 at a predetermined desired time. Due to the precisely controlled or regulated arrival time of the single sheet at the light barrier LS9 results for consecutive single sheets due to the constant transport speed V TR and the time staggered arrival of the individual sheets on the light barrier LS9 a predetermined distance between the successive single sheets. This distance is also referred to as blade pitch or gap.
  • Such controlled by means of target points in time position control of the single sheet is highly accurate and can also be performed at other locations of the printer, eg in front of a printing unit or before outputting the printed page from the printer.
  • the possible adjustment range thus corresponds to the period between the time T23.1 and the time T23.3.
  • the Time T23.3 not in the middle of the setting range, but asymmetrically in the adjustment range, preferably shifted in the direction of the time T23.1.
  • the uniform acceleration of the single sheet X to the pull-in speed V INPUT is also referred to as ramp acceleration.
  • the uniform reduction of the intake speed V INPUT to the conveyor speed V TR is also ramped. Due to the preset accelerations and speeds, the cut sheet X traveled a distance S1 at time T22, a distance S2 at time T24, and a distance S3 at time T25.
  • the pair of rollers WP5 is driven by the stepper motor SM9 with the constant conveying speed V TR , which then only a position correction of the retracted single sheet X using the pair of rollers WP1 and thus only a control of the position of the single sheet X takes place.
  • the arrival time of the cut sheet X is detected at the light barrier LS9 and compared with a set for the single sheet X target time. If there is a deviation of the time of arrival from the desired time, a correction value is determined for subsequent individual sheets to be fed from the storage compartment dress_A, which is then used to determine the time for reducing the intake speed V INPUT to the conveyor speed V TR .
  • This correction value can be, for example, a so-called offset value or a correction factor.
  • FIG. 6 shows the schematic structure of a time control unit 68, as used in the control instances 14 to 22.
  • Identical time control units are used in further control units and modules of the printer, wherein a plurality of instances and / or control units, a time control unit can be assigned.
  • the time control unit 68 serves to monitor setpoint times at which actions in the printer are to be started, such as, for example, when feeding a single sheet or when changing the conveying speed.
  • the timing unit 68 includes timers with two 16-bit cascaded counters T3 and T8. With the help of the counters T3 and T8, a 32-bit timer for monitoring 32-bit setpoints is formed.
  • the counter T3 is supplied with a central clock signal of a clock of the printer with a clock frequency of 100 kHz.
  • the time control after FIG. 6 Target times within a period of 11.93 hours at an input clock frequency of 100 kHz continuously monitored with high accuracy.
  • an interrupt signal 13 and the overflow of the 16-bit counter T8 an interrupt signal I8 is output, which can be used for other control purposes.
  • a counter formed by the time control unit 68 is further counted in order to monitor a set point in time over the 11.93 hours.
  • the job memory CC18 are the low-order 16-bit of a 32-bit setpoint and in memory CC19 the upper 16-bit of the 32-bit setpoint are stored.
  • a comparator C1 compares the 16-bit value stored in the memory CC18 with the current count of a timer T7.
  • the timer T7 is also supplied with the clock signal of 100 kHz of the central clock of the printer.
  • the comparator C1 outputs on reaching and / or exceeding the low-order 16-bit portion of the 32-bit setpoint by the current count of the counter T7 an interrupt signal I18.
  • the comparator C2 continuously compares the upper 16-bit value of the 32-bit setpoint stored in the memory CC19 with the current count value of the counter T8. In case of coincidence or exceeding of the value stored in the memory CC19 Target time, the comparator C2 outputs in interrupt signal I19.
  • the target time is reached.
  • An intended control action is detected by a control unit of the printer, for example by an interrupt of the timing control unit 68 FIG. 6 executed.
  • the time control unit 68 after FIG. 6 For example, it is very easy to realize using the so-called capture / compare unit of the 16-bit micro-processors C164CI and C167CR from Infineon.
  • the time for reducing the pull-in speed V INPUT to the transport speed V TR is to be monitored, then this time is written as a 32-bit value into the memories CC18 and CC19.
  • the comparator C1 Upon reaching the target point in time to reduce the pull-in speed V INPUT to the transport speed V TR , the comparator C1 outputs an interrupt signal I18 and the comparator C2 outputs an interrupt signal I19.
  • Corresponding control operations for reducing the speed are controlled by the control units of the printer on the basis of these two interrupt signals I18, I19.
  • a program routine is provided in the printer which, in a preset operating state of the printer, resets the current counts of all the timing units 68 of the printer and restarts them at the same time.
  • FIG. 7 shows a feeder unit 11, in addition to the elements of the feeder unit according to FIG. 1
  • Such housing parts are, for example, so-called stowage flaps of the intake unit 11, which can be opened for the removal of individual sheets as a result of paper jams or for maintenance.
  • the position sensors are, for example, limit switches which monitor the closed state of these housing parts, ie these stowage flaps.
  • the position monitoring sensors are in FIG. 7 designated S1 to S12.
  • the intake unit 11 has additional stoppers whose position is not monitored by means of sensors. These non-sensor monitored stoppers are mechanically locked to the monitored stoppers so that they can only be opened after opening a monitored stowage flap.
  • FIG. 8 shows several processes for controlling the feeder unit 11 FIG. 7 , These processes are in FIG. 8 Also referred to as tasks, are processed by a controller in parallel or in multitasking mode.
  • the individual processes, ie the individual tasks are processed independently of each other.
  • the operating system or the firmware of the controller controls the simultaneous processing of the processes and the simultaneous execution of the processes in multitasking or multiprocessor operation.
  • simultaneity refers to a development strategy in which the processing capacity of the processor is allocated to the jobs for a short time each time. This short time is also referred to as time slice, timeslot or timeslice. For several processes, it thus seems as if these processes are being processed simultaneously by the controller.
  • the operating system PXROS from HIGHTEC can be used to process several parallel processes, which also makes it possible to start a program in different tasks with different parameters. To monitor the light barriers LS1 to LS13, the same program can be started thirteen times in different tasks, whereby these thirteen tasks and further tasks are executed in parallel.
  • a higher-level module 32 determines from the print data stream information relating to a single sheet X to be printed and sets target times for controlling the single sheet.
  • This higher-level module 32 can, for example, as control entity 12 after FIG. 4 or as a management board 66 FIG. 2 be executed.
  • the higher-level module 32 transfers the values of all set points in time, which relate to the valves V1 to V3 and the light barriers LS2, LS7 and LS9, to the time process 34.
  • the values of the desired times are related to the current time value of a timer.
  • a plurality of timers are provided in the printer, wherein each control unit has its own timer, which are synchronized by means of a synchronizing operation and which are driven by a uniform clock signal.
  • these timers are implemented as 32-bit counters clocked at a clock of 100 kHz.
  • the count of the counter of the timer thus forms the time standard of the printer, to which all target times and actual times are related.
  • the target timings are set by determining a count value of the counter.
  • an event for example when a sheet edge arrives at a light barrier, the light barrier emits a sensor signal.
  • the current count of the timer is detected as the arrival time or as the actual time and, as already described above, compared with the specified target time.
  • the target time points transmitted to the time process 34 include control times for controlling the valves V1, V2 and V3 for removing the cut sheet X from the bin su_B and times for monitoring the paper path of the cut sheet X to the light barrier LS9 with the aid of the light barriers LS2. LS7 and LS9.
  • the desired times are transmitted by means of a message to the time process 34.
  • valve V3 When the valve is open, the valve V3 supplies air to a side nozzle, through which the uppermost single sheet X is located from the rest in the supply compartment su_B. Paper stack detached. becomes.
  • the valve V2 supplies air to a front nozzle through which individual sheets in the storage compartment suction_B are retained below the cut sheet X in the storage compartment su_B.
  • the suction chamber of the suction belt SB_B With the aid of the valve V1, the suction chamber of the suction belt SB_B is supplied with suction air, through which the single sheet X from the paper stack is lifted in the storage compartment für_B and adheres to the suction belt SB_B.
  • the time process 34 transmits all setpoint times for the valves V1, V2, V3 and for the light barriers LS1, LS7, LS9 set by the superordinate module 32 to the valve process with the aid of a message.
  • a message function for transmitting the message is preferably provided by an operating system or firmware of the control unit or data processing system, by which the timer process 34, the valve process 36 and the sensor process 38, 40, 42 are executed.
  • the valve process determines from the transmitted target time points the target time of the next action to be performed and sends back a message with all desired times to the time process 34, wherein the target time of the next action to be performed is marked.
  • the time process 34 determines the designated target points in time and transfers this setpoint time of a time control unit, not shown.
  • this time control unit is contained in a flex module of a real-time module.
  • the time control unit executes an interrupt, by which the time process 34 receives a message with the desired time points and information about reaching the desired point in time for opening the valve V3.
  • the valve process then activates the valve V3 to open.
  • all remaining target times are transmitted from the valve process by means of a message to the time process 34, wherein the target time is assigned, which is assigned to an action to be performed next.
  • the time process 34 transmits a target count value corresponding to the target timing to the timing unit.
  • the time control unit After reaching the desired point in time, the time control unit generates an interrupt.
  • the time process 34 Due to the interrupt, the time process 34 generates a message to the valve process and transmits all still current target times to the valve process and the information that the time to open the valve V2 has been reached. Then the valve process opens the valve V2 and sends a next message with all currently remaining target time points to the time process 34, wherein a target time for opening the valve V1 is marked.
  • the time for opening the valve V1 is transmitted from the time process 34 to the time control unit, which triggers an interrupt after reaching the desired time. Due to the interrupt, the time process 34 generates a message to open the valve V1 and transmits this message to the valve process along with the other desired times. The valve process opens the valve V1. Subsequently, the valve process transmits the remaining target times by means of a message to the time process 34, wherein the target time for closing the valve V3 is marked.
  • the target time for closing the valve V3 transmits the time process 34 to the time control unit.
  • the time control unit triggers an interrupt after reaching the desired time, whereby the time process 34 transmits a message with the remaining target times and information to close the valve V3 to the valve process.
  • the valve process closes the valve V3 Subsequently, the valve process generates a message with the remaining target times, wherein the target point in time for closing the valve V2 is marked.
  • the time process 34 transmits the designated target time to the time control unit, which triggers an interrupt after reaching the desired time. Due to the interrupt the time process 34 generates a message with the remaining target times and the information to close the valve V2 to the valve process.
  • the valve process closes the valve V2 and generates a message with the remaining target times and transmits this message to the time process, wherein the target point in time for closing the valve V1 is marked.
  • the time process 34 transmits the desired time for closing the valve V1 to the time control unit, which outputs an interrupt signal to the time process 34 after reaching the time.
  • the time process 34 generates due to the interrupt message with the remaining target times and information to close the valve V1 to the valve process.
  • the valve process closes the valve V1 and generates a message with the remaining target times and transmits them to the sensor process 38 for overcoming the light barrier LS2.
  • the valves V1 to V3 of the valve process are contained in the storage compartment B for the removal of a single sheet. For the intake trays su_A, rasp_C, rasp_D similar valve processes and time processes are provided, which are processed in parallel to the valve process and the timer process 34.
  • the sensor process 38 determines from the setpoint times transmitted by the valve process 36 a target point in time at which the leading edge of the single sheet X must have arrived at the latest at the light barrier LS2.
  • the sensor process 38 serves to determine paper path errors. High-precision time monitoring, as used with the aid of an already described time control unit in the feed unit 10, 11 of the printer for controlling actuators and determining control instants, is not required for a paper run monitoring.
  • the sensor process 38 includes a time monitor for monitoring the target time for arrival of the leading edge of the single sheet X at the light barrier LS2.
  • the sensor process 38 queries the timer process 34 from the current time and forms with the aid of the transmitted setpoint a time difference. With the help of a counter, this time difference is detected and monitored. After expiry of this counting time, the maximum permissible paper running time up to the light barrier LS2 is thus exceeded and the sensor process 38 generates an error message.
  • a photocell control unit Upon arrival of the leading edge of the light barrier LS2 a photocell control unit generates an interrupt and operates an interrupt service routine.
  • the interrupt service routine transmits a signal to the sensor process 38 which stops or resets the counter of the sensor process 38. When timely arrival of the leading edge of the single sheet X on the light barrier LS2 thus no error message is generated.
  • the sensor process 38 After reaching the desired point in time of the sensor process 38, the sensor process 38 transmits, with the aid of a message, the remaining setpoint times to the sensor process 40 for monitoring the light barrier LS7.
  • the sensor process 40 determines, in the same way as the sensor process 38, a delay time up to which the leading edge of the sheet must arrive at the light barrier LS7.
  • the sensor process 40 generates when not timely arrival of the leading edge of the sheet at the light barrier LS7 an error message.
  • the desired time is monitored by the sensor process 40 by means of a counter.
  • a monitoring unit If the leading edge of the single sheet X arrives in time at the light barrier LS7, a monitoring unit generates an interrupt and operates an interrupt service routine.
  • the interrupt service routine generates a signal to reset the counter of the sensor process 40.
  • the sensor process 40 transmits the setpoint of the sensor maximum permissible target time for the arrival of the leading edge of the sheet at the light barrier LS9 to the sensor process 42.
  • the sensor process 40 monitors in the same way this setpoint, as already described for the sensor process 38 and 40. If the single sheet arrives in time at the light barrier LS9, the sensor process 42 generates a message and transmits it to the higher-level module 32. If a sensor process 48, 40, 42 detects an error, the respective sensor process 38, 40, 42 generates a message with a Error information and then transmits this to the parent module 32nd
  • valve process 36 and for the sensor processes 38, 40, 42 and for other processes such as e.g. the process for driving the stepping motor SM2B
  • a separate time process is provided.
  • the individual desired times are then no longer transferred from valve process 36 to time process 34 and from time process 34 to valve process 36, but are monitored together with the aid of a time process 34.
  • a desired time is reached, e.g. with the help of an interrupt informing or calling the processes affected by this target time.
  • a sensor process 38, 40, 42 is called by an interrupt, an information from the sensor process 38, 40, 42 is transmitted to the time process 34, which determines the time difference to the desired time, if necessary.
  • a control and / or regulation of the sheet position is performed.
  • FIG. 9 shows a timing diagram in which periods of individual sheets of the removal of individual sheets from the storage compartment su_A and the storage compartment su_B are shown to the light barrier LS9.
  • the target start time for removing a single sheet B1 from the storage compartment su_B results from the desired time of the sheet trailing edge of the single sheet A1 at the transfer light barrier LS9 and the sheet spacing time to the single sheet B1.
  • the blade pitch time which is also referred to as gap time, thereby determines at the constant conveying speed V TR the blade spacing between the single sheet A1 and the single sheet B1.
  • the total running time of the single sheet A1 is added to the desired starting time of the single sheet A1 from the storage compartment su_A to the light barrier LS9 and further formed the form factor of the single sheet A1, which is made the transport speed V TR and the sheet length of the single sheet A1 results.
  • the desired time points are monitored by the time control unit 68.
  • FIG. 10 a diagram is shown which shows the sequence of the valve control and the control of the stepping motor SM1B of the suction belt SB_A of the storage compartment su_A.
  • the valve V3 is opened, whereby the topmost sheets of the stack are fanned out on individual sheets in the storage compartment su_A, in order subsequently to be able to more easily remove the upper single sheet from the storage compartment su_A.
  • the valve V3 With the valve V3 open, one or more nozzles located laterally at the top of the stack of paper in the bin Tray_A are fed, which then fan the topmost sheets of the stack as described.
  • the valve V2 is opened, whereby compressed air is supplied to at least one front nozzle.
  • the valve V1 is opened at the time T1, is applied by the suction air to the suction belt SB_A.
  • the suction air is supplied to the suction belt SB_A.
  • the individual sheets are separated below the upper single sheet from the upper single sheet, which is applied to the suction belt SB_A by the suction air.
  • FIG. 10 shows the timing of the valves V1, V2, V3 and the stepping motor SM1B at a transport speed V TR of 847 mm / s, in the 160 individual sheets in DIN A4 paper size per minute by the feed unit 11 after FIG. 7 supplied to the printer.
  • FIG. 11 a speed-time diagram is shown, the speed profile of a single sheet when removed from a storage compartment suction belt SB_A the feed unit 11 after FIG. 7 shows.
  • the cut sheet is applied to the suction belt SB_A and the stepping motor SM1B for driving the suction belt SB_A is started.
  • the stepping motor SM1B is controlled in such a way that the suction belt SB_A is accelerated uniformly with an acceleration of 50 m / s 2 to a speed 3.5 xv 0 during the period t10.
  • the speed v 0 is 338.6 mm / s in the present embodiment.
  • the single sheet is conveyed at a constant speed 3.5 xv 0 until time T12.
  • the time T11.1, at which the leading edge of the single sheet reaches the light barrier LS1, is detected and compared with a predetermined target time. Depending on the result of the comparison, the time t11.1 and thus the time T12 is set at which the conveying speed of the single sheet is started to be reduced from the speed 3.5 xv 0 .
  • FIG. 2 shows a block diagram of a control unit 52 with a time control unit for determining and monitoring setpoint times in the feed unit 11 of the printer.
  • the monitoring of the desired time points takes place with the aid of a timer interrupt controller.
  • This timer interrupt controller is in the present embodiment as a flex timing module executed with the designation EPF10K30AQC208-3 the company ALTERA.
  • the timer interrupt controller includes a timer 68 having a 32-bit counter to which a clock signal (100 KHz) of a clock 45 is supplied to the main controller 44.
  • the timer interrupt controller includes a comparator 69, an expired job memory 70, and an interrupt controller 71.
  • the management board 66 receives control data from the main controller 44.
  • the management board 66 determines from these control data target timing for controlling actuators and monitoring sensors. These setpoint times determined by the management module 66 are supplied to the comparator 69 of the timer interrupt controller.
  • the target timings are passed to the comparator 69 as 32-bit counts.
  • the comparator 69 stores the desired time points and compares the transmitted desired time points with the current count value of the timer 68. If a setpoint time coincides with the current count value, this information is stored in the memory 70 with the aid of data.
  • the interrupt controller 71 determines the achieved target timings and triggers an interrupt to perform the control action, i. to control an actuator or to set the desired time of a sensor from.
  • the interrupt controller 71 executes an interrupt service routine and transmits to a control and monitoring unit 72, depending on the interrupt, data for actuating actuators, in particular valves, and for monitoring sensors, in particular photoelectric sensors.
  • the stepper motor controller 64 is also supplied with the clock signal of the clock 45 to the main controller 44. Furthermore, the control unit 66 of the stepper motor controller in each case transmits the next set point in time for driving the stepping motor controlled by the stepper motor controller 64.
  • the stepper motor controller 64 contains its own time control unit for monitoring the transmitted setpoint value. Upon reaching the setpoint, the stepper motor controller 64 executes a corresponding control action. After reaching the setpoint, the management module 66 transmits the stepper motor controller 64 optionally a further setpoint.
  • the timer 68 may also include two cascaded 16-bit counters.
  • the target times stored in comparator 69 and in memory 70 may be determined by main controller 44, e.g. be deleted individually and / or completely after an error has occurred.
  • the checking and comparison of the desired times with the current time of the timer 68 takes place every 10 ⁇ s. If a plurality of setpoint times are reached simultaneously, information about the reaching of the setpoint times is stored in the memory 70 and the interrupts control 71 successively trigger corresponding interruptservice routines.
  • photoelectric sensors or pivot lever switches are used as sensors for detecting the position of individual sheets.
  • the rocker switches have a mechanical actuator which protrude into the path of travel of the cut sheets through the printer and are urged away by a passing sheet such that the rocker switch outputs a sensor signal. If the sheet is moved past the swivel lever switch, a restoring moment causes the sensor arm of the swivel lever switch to project back into the paper path and be actuated again by a next sheet. After resetting the pivot lever no sensor signal is output.
  • the time can be accurately determined similar to a light barrier, to which a front and / or rear edge of the sheet arrives at the sensor.
  • Other sensors may also be position sensors of actuators, such as position switches of stepper motors, switches, valves or flaps of the printer or copier.
  • actuators such as position switches of stepper motors, switches, valves or flaps of the printer or copier.
  • all reference times and actual times refer to the same time standard, eg the system time of the pusher.
  • a synchronization process must be provided so that all the time control units have the same system time.
  • timers of the timing units for example, clocked cascaded counters can be used with the aid of a central clock signal. This provides an exact same reference time for all control units.
  • a plurality of processes can be provided, wherein at least one sensor is monitored by a process and at least one actuator is controlled by a second process.
  • the processes can be processed in multitasking mode.
  • a very simple control structure can be realized with the aid of a control unit for controlling a plurality of sensors and a plurality of actuators.
  • it is advantageous to provide a separate timing process which compares at least two desired times with the actual time and outputs when reaching or exceeding the actual time, an output signal. It is advantageous to provide the timing process for monitoring up to 200 target times. This ensures that the individual control units no longer need to monitor the target times, whereby simple and inexpensive control units can be used.
  • At least one interrupt signal as an output signal of the timing process in another embodiment, which activates an interrupt service routine in the respective controller / in the affected controllers.
  • FIG. 13 a printer 73 with a first printing unit 74 and a second printing unit 76 is shown.
  • the printer 73 is operated in a first mode. Not one illustrated single sheet is fed to the printer 73 in the direction of arrow P10. Possible delivery paths of the single sheet by the printer 73 are shown with dotted lines, wherein the supplied single sheet is passed on these conveyor paths on the printing unit 74 and / or on the printing unit 76 for printing the single sheet with one or more printed images.
  • the actual conveying path of the supplied single sheet in the first operating mode is indicated by the arrows P12 to P15 and shown as a solid line.
  • the printer 73 for example, from a feed device 11, supplied single sheet is moved past the printing unit 74 and printed by this on the front with a first printed image. Subsequently, the single sheet is conveyed further in the direction of the arrows P13 and P14 and then in the direction of the arrow P15 to the printing unit 76. The printing unit 76 generates on the back of the single sheet a second image. In the area of the arrows P14 and P15, the single sheet is turned to supply it to the printing unit 76 with a printing unit 76 facing the rear side. In this in FIG. 13 shown first mode, the printer 73 successively front and back of the supplied single sheet, for example, in the same color print.
  • FIG. 14 is the printer 73 after FIG. 13 illustrated, wherein the printer 73 is shown in a second mode for single-sided printing of single sheets.
  • the individual sheets are the printer 73, as already associated with FIG. 13 described, fed in the direction of arrow P10.
  • the fed cut sheet can be conveyed to an upper conveying path along the solid line in the direction of the arrow P17 or along the solid line in the direction of the arrow P18 on a lower paper path through the printer 73. If a first single sheet is transported along the lower paper path P18 through the printer 73, it is fed to the printing unit 74, which is on the first single sheet predetermined first printed image generated.
  • the main controller 64 determines the conveyance path of the cut sheet by the printer 73 and determines the operation mode in which the printer 73 is operated to print the cut sheet. From the document WO 98/18052 and from the document WO 98/18054 For example, a two-printing-type printer and a method of operating such a printer are known.
  • the printer is operable in a first so-called duplex mode, in which the first printing unit on the front of a supplied single sheet produces a first printed image and the second printing unit generates a second printed image on the back of the single sheet.
  • a first single sheet is fed to the first printing unit 74 on a first conveying path for printing the front side
  • a second individual sheet is fed to the second printing unit 76 for printing on the front side of the second individual sheet on a second conveying path fed.
  • the invention switches from the first to the second operating mode only when a preset number of successive single sheets is to be printed on one side.
  • the optimum number to be pre-set is the structure of the printer 73, in particular the paper format, the required minimum pitches when switching between the modes as well as the printing speed differences between the single-sided printing of single sheets in the duplex mode and in the fast-simplex mode. Both in a calculation and in test series with the printer 73, it has proved to be favorable for the number of pages to be printed to be set to have a value in the range between four and twenty. Preset DIN A4 single sheets. The value ten has proven to be particularly favorable.
  • FIG. 15 a table is shown in which the mode selection of the printer 73 depends on the number of printable in the respective mode. Pages is shown.
  • Column 1 of the table are in a continued-submitted during the interview on consecutive numbering the successively to be printed single sheets specified.
  • FIG. 15 indicates whether the sheet is to be printed on one or both sides.
  • Column 3 of the table shows the provisional route selected.
  • Column 4 of the table gives an explanation of the selection of the conveying path of each individual sheet.
  • Column 5 of the table shows the changed paper paths after a revaluation, ie after reaching the specified number of consecutive single-sided single sheets, and in column 7 of the table the mode in which the respective single sheet is printed by the printer 73.
  • the first single sheet 1 is to be printed on one side. It is selected a conveying path on which the single sheet 1 is printed by the printing unit 74 on one side.
  • the single sheet 2 is also to be printed on one side. It is selected a conveying path in which it passes the printing unit 76 and is printed by this.
  • the third single sheet 3 is also to be printed on one side and is conveyed on the same conveying path as the single sheet 1 by the printer 73 to the printing unit 74 and printed by this one-sided.
  • the printing of the single sheets 1 to 3 takes place in the operating mode 2, i. the fast simplex mode.
  • the fourth single sheet 4 is to be printed on both sides.
  • the single sheet 4 being conveyed on a conveying path through the printer 73, on which it is guided past the printing unit 74 with the front side and with the printing unit 76 at the rear.
  • the single sheet 5 is to be printed on one side.
  • a control unit for selecting the operating mode checks whether the preset number of ten successive single-sided sheets is already reached, which is necessary to switch the operating mode from the operating mode 2 to the operating mode 1.
  • the single sheet 5 is the first one-sided to be printed As shown in column 3, the mode 2 is maintained, with only the printing unit 74 or only the printing unit 76 generates a printed image on the front side of the single sheet 5.
  • the single sheets 6 to 13 are also printed on only one side.
  • the control unit continuously checks on each cut sheet 6 to 13 whether the preset number of successive single-sided sheets to be printed has already been reached or exceeded.
  • the single sheet 14 is also to be printed on one side.
  • the operation mode selection unit determines that the preset number of ten cut sheets has been reached with the cut sheet 14 since the cut sheets 5 to 14, i. ten consecutive single sheets are to be printed on one side.
  • the control unit determines that the single sheets 5 to 14 are not printed as for the single sheets 5 to 13 originally selected in the mode 1, but in the mode 2. For the single sheets 5 to 13 of the conveying path is redetermined by the printer.
  • a conveying path is selected, which passes the single sheet on the printing unit 74, wherein the single sheet 4, a large, required for the switching of the operating modes sheet spacing between the individual sheets 4 and 5 to be observed minimum distance is set.
  • the following single sheets 6 to 14 are then alternately supplied to the printing unit 74 or 76, as indicated in the columns 5 and for the single sheets 14 in column 3.
  • the following single sheet 15 is also to be printed on one side and is fed to the printing unit 74 for printing.
  • the single sheets 5 to 15 are thus printed in the fast-simplex mode by the printer 73.
  • the single sheet 16 is to be printed on both sides.
  • the mode for printing the cut sheet 16 is switched from the mode 2 to the mode 1.
  • the required minimum pitch is provided when switching from mode 2 to mode 1.
  • the single sheets 17 and 18 are also like the single sheet 16 to be printed on both sides, the mode 1 is maintained.
  • the control unit for selecting the operating mode of the printer 73 the printed pages to be subsequently printed are generally registered.
  • the control unit thus has a flow of individual sheets to be printed.
  • the control unit assigns each sheet a conveying path for generating the desired print image or the desired printed images on the single sheet and sets a sheet distance to the previous single sheet. This takes place at least before the relevant single sheet is fed to the printer 73, or before the single sheet is removed from a storage compartment su_A to aus_D the feed unit 11 of the printer 73.
  • the Bedrukken a single sheet is considered as a printing process.
  • the inventive method for switching the operating modes is particularly advantageous to use when a continuous promotion of the single sheets is done by the printer 73, without so-called stop positions are included in the conveyor. Especially with such printers, a significant increase in the printing speed can be achieved.
  • the print data of at least the preset number Store individual sheets in a memory of the printer, which are then evaluated by the control unit.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Handling Of Sheets (AREA)
EP03785627A 2002-10-28 2003-10-16 Verfahren und vorrichtung zum steuern eines elektrografischen druckers oder kopierers Expired - Fee Related EP1561152B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10250194A DE10250194A1 (de) 2002-10-28 2002-10-28 Verfahren und Vorrichtung zum Steuern eines elektrografischen Druckers oder Kopierers
DE10250194 2002-10-28
PCT/EP2003/011488 WO2004040379A2 (de) 2002-10-28 2003-10-16 Verfahren und vorrichtung zum steuern eines elektrografischen druckers oder kopierers

Publications (2)

Publication Number Publication Date
EP1561152A2 EP1561152A2 (de) 2005-08-10
EP1561152B1 true EP1561152B1 (de) 2012-06-06

Family

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EP03785627A Expired - Fee Related EP1561152B1 (de) 2002-10-28 2003-10-16 Verfahren und vorrichtung zum steuern eines elektrografischen druckers oder kopierers

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Country Link
US (1) US7835684B2 (ja)
EP (1) EP1561152B1 (ja)
JP (1) JP4681299B2 (ja)
CN (2) CN101625534B (ja)
DE (1) DE10250194A1 (ja)
WO (1) WO2004040379A2 (ja)

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DE102008048278B4 (de) * 2008-09-22 2010-06-24 Eastman Kodak Co. Verfahren zum Erstellen eines Profils einer Druckgeschwindigkeit einer Druckmaschine
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Also Published As

Publication number Publication date
US7835684B2 (en) 2010-11-16
JP4681299B2 (ja) 2011-05-11
CN101625534B (zh) 2013-08-14
CN100541339C (zh) 2009-09-16
WO2004040379A2 (de) 2004-05-13
CN101625534A (zh) 2010-01-13
EP1561152A2 (de) 2005-08-10
JP2006503779A (ja) 2006-02-02
WO2004040379A3 (de) 2004-12-29
CN1708732A (zh) 2005-12-14
DE10250194A1 (de) 2004-05-13
US20060239699A1 (en) 2006-10-26

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