EP1491347B1 - Méthode et système pour réduire les erreurs d'impression dans un appareil de traitement de courrier - Google Patents

Méthode et système pour réduire les erreurs d'impression dans un appareil de traitement de courrier Download PDF

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Publication number
EP1491347B1
EP1491347B1 EP03090193A EP03090193A EP1491347B1 EP 1491347 B1 EP1491347 B1 EP 1491347B1 EP 03090193 A EP03090193 A EP 03090193A EP 03090193 A EP03090193 A EP 03090193A EP 1491347 B1 EP1491347 B1 EP 1491347B1
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EP
European Patent Office
Prior art keywords
encoder
signal
value
printing
print
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
EP03090193A
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German (de)
English (en)
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EP1491347A1 (fr
Inventor
Joachim Jauert
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.)
Francotyp Postalia GmbH
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Francotyp Postalia GmbH
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Publication date
Application filed by Francotyp Postalia GmbH filed Critical Francotyp Postalia GmbH
Priority to AT03090193T priority Critical patent/ATE307032T1/de
Priority to EP03090193A priority patent/EP1491347B1/fr
Priority to DE50301430T priority patent/DE50301430D1/de
Priority to DK03090193T priority patent/DK1491347T3/da
Publication of EP1491347A1 publication Critical patent/EP1491347A1/fr
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Publication of EP1491347B1 publication Critical patent/EP1491347B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
    • B41J11/42—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/20—Positive-feed character-spacing mechanisms
    • B41J19/202—Drive control means for carriage movement
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00185—Details internally of apparatus in a franking system, e.g. franking machine at customer or apparatus at post office
    • G07B17/00314—Communication within apparatus, personal computer [PC] system, or server, e.g. between printhead and central unit in a franking machine
    • G07B2017/00338—Error detection or handling
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G07B2017/00516—Details of printing apparatus
    • G07B2017/00556—Ensuring quality of print
    • G07B2017/00564—Ensuring correct position of print on mailpiece
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G07B2017/00637—Special printing techniques, e.g. interlacing

Definitions

  • the invention relates to a method for reducing printer errors during printing in a mailing machine, according to the preamble of claim 1 and an arrangement according to the preamble of claim 4.
  • the invention is used in franking machines, addressing machines and other printing mail processing equipment.
  • the invention is related to unpublished German patent applications 10230678.8 entitled "Arrangement for Controlling Printing in a Mailing Machine” and 10230679.6 entitled “Method for Controlling Printing in a Mailing Machine".
  • the variable print image share is becoming more extensive and the print resolution is getting higher and higher.
  • the variable printed image portion should be flexible for different postal requirements and is changed from impression to impression.
  • the controller is burdened with other tasks.
  • a microprocessor To relieve the control by a microprocessor, it has proven to be advantageous to arrange the pixel data belonging to a print image column in the pixel memory so that variable picture elements can be changed by the microprocessor in the available time. Furthermore, it has proven to be advantageous if the responsible for the control of the printing mail processing device or system microprocessor is relieved by a pressure data control in the control of printing.
  • the printing requires a relative movement between a print head and a print carrier, for example a sheet-like object, letter, postcard, packet, franking strip, address label or label.
  • US 6,457,901 (DE 10032855 A1) is an apparatus for printing a printing medium proposed in a mailing machine, as preferably in the franking machine pusil® the patentee Francotyp Postalia AG & Co.KG is used.
  • the print carriers for example, envelopes, franking strips or comparable franking goods, be post downstream by means of a driven transport drum transported in the transport direction, with a non-driven Counterpressure the print carrier against the transport drum in Pressing direction orthogonal to the transport direction presses.
  • the two Ink cartridges partially protrude into the transport drum and carry two inkjet printheads which are printing on the moving Carry out the print carrier without contact.
  • Both printheads are orthogonal to the transport direction and orthogonal to the pressure direction and with their Nozzles arranged near the edge of the transport drum, the nozzles during a pass of the print carrier through the machine a complete Can produce impression.
  • On the front side of the transport drum are applied close to the perimeter markings that over the Scope of the transport drum are distributed.
  • the markers are for example Reflective lines that come from a reflex light bank or Transmitted light sensor of an encoder detected by the microprocessor and a Control are converted into pressure pulses in the ratio 1: 1. Gradual slow fluctuations in transport speed thus have no influence on a generated print image when the Pressure cycle is changed accordingly in its duration.
  • a print cycle should be 90% of the time take between two positive encoder edges.
  • the time between the Encoder edges can be measured and the printing cycle time accordingly be adjusted.
  • the set value for the print cycle duration will be the first after its detection with a delay of at least two Encoder clocks effective.
  • the object of the invention is a method and an arrangement to reduce printer errors while printing on to provide moving mail in a mailing machine, the Printer error due to encoder pulses too short a time interval be caused.
  • a cost-effective solution is also under unfavorable conditions ensure high print quality.
  • the print data control is connected on the one hand via a bus with the microprocessor and with a pixel memory for the transmission of the print data and on the other hand with an encoder which detects the movement of the print carrier.
  • At least one print head is connected to the print data controller in a manner known per se via a driver circuit.
  • the print data controller in a printhead-type dependent sequence, provides the required data to the respective drive circuitry of an associated printhead.
  • the print data controller has an evaluation unit and a logic for error reduction of printer errors, which encoder pulses are supplied and which contains a resettable encoder clock counter whose count is incremented within a count range smaller than or equal to an upper limit with each leading edge of an encoder pulse whose count is decremented with each print cycle start and the output side outputs a digital count, the latter being evaluated by the evaluation unit with respect to exceeding a set within the count range target value, when not exceeding the aforementioned target value, each print cycle completely executed and a running print cycle when exceeding the aforementioned target value the condition is aborted that all direct memory accesses (DMA cycles) to the pixel memory are prepared, which prepare the next print cycle ,
  • the print data control consists, for example, of at least one pixel data processing unit, a DMA controller, an address generator and a printer controller.
  • the pixel data for each current print cycle is alternately stored in one of two buffers of the pixel data preparation unit.
  • the pixel data for the next print cycle are loaded via DMA into a second buffer of the pixel data processing unit, while the pixel data for the current print cycle are transmitted to the respective driver circuit of the associated print head.
  • the address generator for this purpose provides read addresses for pixel data of the pixel data processing unit and the printer controller organizes the serial output of the pixel data to the respective driver circuit in a print cycle in response to the encoder pulses.
  • the printer controller according to the invention has a logic for error reduction of printer errors, which are caused by encoder pulses too short a time interval.
  • the aforesaid logic includes a resettable encoder clock counter whose count is incremented within a count range less than the upper limit of each leading edge of an encoder pulse, the count of which is decremented at each print cycle start, and whose outputs are coupled to first and second comparators, the first comparator being reached of the zero count prevents decrement and the second comparator checks to reach the upper limit.
  • the encoder clock counter provides the output side of the aforementioned count and is operatively connected to the address generator, the latter aborts the current print cycle when all pixel data for the next print cycle via DMA have already been loaded into the buffer of the pixel data processing unit and the counter value in the count range of the encoder clock counter a predetermined Setpoint has exceeded.
  • FIG. 1a shows a pulse / time diagram for correct encoder pulses without error reduction.
  • a print cycle and a DMA period are started with DMA cycles when previously a previous print cycle has been completed. The latter is the case with correct encoder pulses.
  • a mail piece is moved in the transport direction under or on at least one print head along.
  • the print image is generated from columns in a vertical arrangement to the transport direction, each print head with a time-offset printing an associated part of the same column.
  • the time offset in the control of both printheads in order to print one and the same column results, on the one hand, from the distance between the two printheads in the transport direction and, on the other hand, from the transport speed of the print carrier in the transport direction. Since the two print heads are arranged offset in the transport direction to each other and each printhead has at least 300 nozzles, which are also arranged in two spaced in the transport direction nozzle rows, pixels are printed in four spaced pressure columns at the same time driving both printheads at any time. The control of all 300 nozzles of each printhead takes place within a printing cycle in which 22 groups of 14 pixel data are successively transferred to the printhead and printed. The letter movement is detected by an encoder.
  • FIG. 1b shows a pulse / time diagram for encoder pulses, in which the third to sixth encoder pulses in too short a time Distance occur. So not every encoder pulse will trigger a print cycle out. This causes some encoder pulses, especially the third one and fifth encoder pulse, now no print cycle and no DMA period trigger because the time between the second to sixth encoder pulses too short. The causes are different. The to Insertion of an encoder disk can result in an error of up to 10% exhibit. Also needs additional errors such as one sudden change in transport speed can be assumed, due to changes in letter thickness, bumps and mechanical Vibrations between encoder disk and encoder scanning caused become. Despite an adjustment of the pressure cycle time to the Distances between the encoder edges must therefore with printing errors calculated by too small distances between the encoder pulses if no measures are taken to reduce the error.
  • FIG. 1c shows a pulse / time diagram for encoder pulses without error reduction, wherein due to too short a pulse width and / or pause, the second to seventh encoder pulses have too short a time interval, so that over a longer period of time, only each one second print cycle and time period is triggered with DMA cycles.
  • DMA cycles For printing, in particular a 2D barcode, printed image errors can be very annoying if the authenticity of a franking imprint is to be detected therewith.
  • the next following encoder pulse triggers a print cycle, ie in Figure 1b, the fourth and sixth encoder pulse and in Figure 1c, the fourth, sixth and eighth encoder pulse.
  • the distance between the printed dots in the transport direction is about twice as large as intended.
  • the pixels belonging to a print column are offset over several print columns offset as dots. The print quality deteriorates to the extent that encoder pulses occur in too short a time interval.
  • FIG. 1d shows a pulse / time diagram for correct encoder pulses with error reduction.
  • the time between the encoder edges is from the Microprocessor then determines the print cycle duration the information the printhead manufacturer adjusts accordingly with a delay of at least two encoder clocks becomes effective. According to printhead manufacturer should a print cycle as possible 90% of the time between two take positive encoder edges.
  • the invention is a counter for Encoder pulses used with too short a time interval. Of the Encoder clock counter is used for error reduction. He will be at the beginning of each Pressure cycle reset to the value 'zero' and at each Encoder pulse increments, i. set here to the value 'one'. To the start of the DMA controller and the address generator, wherein the latter triggers the print cycle for the pixel data of a data string, the encoder clock counter is decremented, i. here to the value 'zero' set.
  • FIG. 1e shows a pulse / time diagram for encoder pulses too short a time interval and with error reduction.
  • the time interval between the first two encoder pulses is greater as a print cycle.
  • the second to the sixth encoder pulse is the time interval between adjacent encoder pulses, however significantly smaller than a print cycle.
  • From the sixth encoder pulse is the time interval between adjacent encoder pulses again larger and larger than a print cycle.
  • FIG. 1f shows a pulse / time diagram for encoder pulses Error reduction, whereby the encoder pulses are too short a pulse width and / or pause over a longer period of time.
  • FIG. 2 shows the block diagram of the preferred circuit arrangement for pixel data processing by a print data controller.
  • One first and a second print head 1 and 2 are each via a driver unit (Pen Driver Board) 11 and 12 with a print data control 4 connected, which in the case of a direct memory access on the input side 16 bit assumes parallel binary print image data from a BUS 5 and on the output side serially binary print image data to the driver units 11 and 12 delivers.
  • the BUS 5 are at least one microprocessor 6, a pixel memory 7, a nonvolatile memory 8 and a read-only memory 9 connected in terms of address, data and control.
  • An encoder 3 is connected to the print data controller 4 for caching binary pixel data and printing the image columns trigger each printhead with a clock frequency of max.
  • the print data controller 4 has a first and second pixel data processing unit 41 and 42 and the associated Controls such as DMA controller 43, address generator 44 and Printer control 45.
  • the controls are included for error reduction of printer errors, an evaluation unit 453 and a logic 452, which the encoder pulses e are supplied. It is intended that one Printer controller 45 at least with the DMA controller 43 and with the Address generator 44 and that the address generator 44 with the Pixel data processing unit 41, 42 is connected in terms of control.
  • the printer controller 45- is connected directly to the microprocessor 6 via the BUS 5 and via an interrupt signal control line I.
  • the DMA controller 43 is connected to the microprocessor 6 via a control line for DMA control signals DMA ACK , DMA REQ .
  • FIG. 3 shows a section of the circuit arrangement according to FIG. 2 with the pixel data processing unit 42 for the second print head, with the DMA controller 43 for a direct memory access (DMA) as well as with the address generator 44 and the printer controller 45.
  • the encoder 3 supplies a signal e and is connected to the inventive logic 452 of the printer controller 45.
  • the latter is connected to the DMA controller 43 directly via control lines 46 for first DMA control signals (DMA start and DMA busy), the DMA controller 43 being supplied with the DMA start signal by the printer controller 45, and with the DMA Control 43 outputs the DMA busy signal with the value 'zero' to the printer controller 45 to signal that the DMA cycles have ended.
  • the DMA controller 43 is also connected to the address generator 44 via a DMA busy signal control line 50.
  • the printer controller 45 is connected to the microprocessor 6 via the bus 5 and via an interrupt signal control line 47, to the address generator 44 via a control line for supplying an address generator start signal AG-start and to the DMA controller 43 via a switching line 49 for a switching signal SO connected.
  • At least the microprocessor 6, the pixel memory 7, the nonvolatile memory 8 and the read-only memory 9 are connected in terms of address, data and control via the bus 5.
  • the printer controller 45 has means for generating and outputting a switching signal SO in order to drive the pixel data processing unit 42 thereby selecting the pixel data from the respectively first or the respective second of the two latches 412 and 422 for transmission to the driver unit 12 become.
  • the driver unit 12 can thereby be supplied in groups to the binary pixel data of a further data string.
  • the DMA controller 43 is supplied from the printer controller 45, the switching signal SO.
  • the DMA controller 43 has means for generating and outputting selection signals Sel_2.1, Sel_2.2 as a function of the switching state of the switching signal SO in order to buffer the binary pixel data into the respectively first or the respective second of the two latches 421 or 422, wherein in a transfer of pixel data from the respective one of the two latches to the driver unit 12, the respective other latches for buffering a data string are successively selected by the selection signals.
  • the binary pixel data is provided to the pixel data conditioning unit 42 in the DMA periods in a data string manner, respectively.
  • the DMA controller 43 outputs the DMA busy signal with the value 'zero' to the printer controller 45 to signal that all direct memory accesses have occurred, ie, the period is completed with DMA cycles.
  • the printer controller 45 is connected to the address generator 44 via at least one control line for supplying a start signal (AG start).
  • the address generator 44 has - in a manner not shown here - a unit for generating read addresses and means for forming an address read signal AR. If a number of address read signals AR has been generated for an address group A, the address generator 44 outputs a print start signal PS via the control line 48 to the printer controller 45. After transmission of a 22nd data set all of the 300 binary pixel data are transmitted, which requires a 1 ⁇ 2 inch inkjet print head for printing per print cycle. The other half of the print image is printed by the first printhead.
  • the pixel data processing unit for the first printhead is constructed in a similar manner.
  • the printer controller 45 is connected to the microprocessor 6 via a control line 47 for an interrupt signal I and via the bus 5. At least the microprocessor 6, the pixel memory 7, the non-volatile memory 8 and read-only memory 9 are connected in terms of address, data and control via the BUS 5.
  • the printer controller 45 has means for generating and outputting a switching signal SO and is connected via a control line to the DMA controller 43 and to the pixel data processing unit 42. The latter is controlled in order to select one of the latches 412, 422 for the transmission of pixel data to the driver unit 12 by means of a switching signal SO. The latter can thereby be supplied in groups to the binary pixel data of an already stored data string.
  • the switching signal SO is supplied to the DMA controller 43 to select the other one of the latches 412 and 422 for pixel data loading.
  • the DMA controller 43 has means for generating and outputting selection signals Sel_2.1, Sel_2.2 as a function of the switching state of the switching signal SO in order to buffer the binary pixel data into the respectively first or the respective second of the two latches 421 or 422, wherein in a transfer of pixel data from the respective one of the two latches to the driver unit 12, the respective other latches for buffering a data string are successively selected by the selection signals.
  • the two pixel data processing units are each connected to the input side of the bus 5 but there only to the low-order 16 bits of the data bus.
  • the terms "data word” and “wordwise” should always be understood to mean a 16-bit wide data word if the data word width is not expressly specified additionally.
  • the pixel data for a 1 ⁇ 2 inch printhead requires only half the space (at most 320 bits from each data string) in the pixel memory 7, from which this pixel data is provided to the pixel data conditioning unit 42.
  • a data string for both printheads therefore requires that buffering of 20 * 16 bit data words each time be performed twice, for example in the respective first buffer.
  • the first and second latches 421 and 422 are alternately selected by the selection signals Sel-2.1 and Sel-2.2.
  • the DMA controller 43 is control connected to the microprocessor 6 and to the latches 421 and 422, that the DMA controller 43 comprises means for generating and outputting address write signals AW, which in a DMA access to the in Pixel memory 7 stored binary pixel data allow their writing to the latches 421, 422 of the pixel data processing unit 42.
  • the DMA controller 43 supplies a 5-bit address write signal AW for wordwise addressing. The latter is in each case at a separate address input of the first and second buffer memories 421 and 422 for pixel data for the second print head.
  • the DMA controller 43 provides a first select signal Sel_2.1 for pixel data for the second printhead and asserts a separate control input of the first pixel data for the second printhead 421.
  • the DMA controller 43 provides a second select signal Sel_2.2 for pixel data for the second printhead and asserts a separate control input of the second pixel data latch 422 for the second printhead.
  • the address generator 44 has at least means for generating and outputting address signals AR, AP and control signals WR, LD, PS, and wherein the address signals AR, AP and control signals WR, LD of the pixel data processing unit 41, 42 for selecting the cached binary pixel data and their grouping in a predetermined order.
  • Each pixel data processing unit has two latches, a selector for selecting the binary pixel data, and a shift register for parallel / serial conversion of the binary pixel data provided in a new order.
  • the address read signals AR generated by the address generator 44 are supplied to the latches and the selector of the pixel data processing unit.
  • the primitive address signals AP and the write control signal WR generated by the address generator 44 are supplied to the selector, and a load signal LD is supplied to the shift register.
  • a start signal AG-start is supplied to the address generator 44.
  • the address generator 44 now provides an address read signal AR for selecting the data word with the pixel data destined for the second printhead. For word-by-word addressing, the higher-order bits of the address read signal AR are applied to a separate address input of the first and second buffer memories 421 and 422.
  • the four least significant bits of the address read signal AR are applied to an address input of a second selector 423 and allow addressing within the 16-bit data word.
  • the parallel data outputs of the first and second pixel data for the second printhead 421 and 422 are applied to a first and second input of the selector 423, controlled by the address generator 44 at its output a 14 bit parallel data signal to the parallel data input of a shift register 424 for Pixel data for the second printhead.
  • the shift register 424 is controlled by a shift clock signal SCL of the printer controller 45, and outputs a serial data output signal SERIAL DATA OUT 2.
  • the address generator 44 also generates a primitive address AP for controlling the selector 423 and a write signal WR.
  • the address generator 44 outputs a load signal LD to the shift register 424 and a print start signal PS to the printer controller 45.
  • the latter outputs the Latch and Print2 signals for the control of the Pen Driver Board 12.
  • the printer controller 45 is connected via a control line for the output of the switching signal SO to a corresponding control input of the DMA controller 43 and to the selector 423 of the pixel data processing unit 42.
  • the printer controller 45 has evaluation means for evaluating the address and control signals transmitted via BUS 5, which are evaluated with regard to the occurrence of a print command.
  • the printer controller 45 generates at least the DMA start, AG start and SO signals, stores the latter in registers, and communicates with the DMA controller 43 via DMA start, DMA busy, and SO signal control lines.
  • the SO signal is generated only upon receipt of a print command and triggered by the print command is output from the printer controller 45, a first control signal DMA start to the DMA controller 43, the latter then generates a request signal DMA REQ and sends to the microprocessor 6.
  • the microprocessor has an internal DMA controller (not shown) which, in the case of a direct memory access, applies a specific address to the pixel memory (RAM) 7, thereby enabling word-wise transmission of binary pixel data via BUS 5 to the latches.
  • An address write signal AW is supplied to the latches by the DMA controller 43 for this purpose.
  • the microprocessor 6 can read out from the pixel memory 7, for example, a 16-bit wide data word with pixel data via DMA and transmit it to the print data control unit.
  • the microprocessor 6 sends an acknowledgment signal DMA ACK to the DMA controller 43 to synchronize the generation of the address write signal AW in the DMA controller 43 with the DMA cycle of the microprocessor 6.
  • a 16-bit wide data word with binary pixel data enters a buffer.
  • Each of the four latches can provide a total of 320 bits for further data conditioning after each 20 DMA cycles. To achieve a print resolution of 600 dpi, two of the four buffers each are used for storage during the DMA cycles.
  • DMA controller 43 supplies first and second select signals Sel_2.1 or Sel_2.2 alternately for word-wise storing pixel data for the second printhead.
  • the DMA controller 43 supplies a first selection signal Sel_2.1 and an address write signal AW for the alternate and wordwise storage of pixel data for the second print head.
  • the number of pixels desired for each print image column requires a maximum of 40 data words to buffer 16 bits in two out of four latches.
  • circuit means are provided for outputting the second control signal DMA-busy and for realizing at least one cycle counter for a predetermined number of 16-bit data words.
  • the binary pixel data for the first printhead is word-delivered via BUS 5 and applied to a corresponding data input of the first and second latches 411 and 412 for pixel data for the first printhead.
  • the first pixel data processing unit 41 for the first printhead-not shown in detail- also includes first and second latches 411 and 412, which are each connected on the input side to the low-order 16 bits of the data bus of the bus 5.
  • the address write signal AW supplied by the DMA controller 43 is also applied to each of a separate address input of the first and second buffer memories 411 and 412 for pixel data for the first printhead.
  • the DMA controller 43 supplies a first select signal Sel_1.1 for pixel data for the first printhead and asserts a separate control input of the first pixel data stager 411 for the first printhead.
  • the DMA controller 43 provides a second select signal Sel_1.2 for pixel data for the first printhead and asserts a separate control input of the second pixel data for the first printhead.
  • the address read signal AR provided by the address generator 44 is also applied again to a separate address input of the first and second buffer memories 411 and 412 for pixel data for the first print head and to a first selector 413.
  • the parallel data outputs of the first and second pixel pixel data latches 411 and 412 are applied to first and second inputs of the selector 413, controlled by the address generator 44 at its output, a 14 bit parallel data signal to the parallel data input of a shift register 414 for Provides pixel data for the first printhead.
  • the shift register 414 is controlled by the shift clock signal SCL of the printer controller 45 and outputs a serial data output signal Serial data out 1.
  • the printer controller 45 outputs a shift clock SCL to the pixel data for the first printhead shift register 414 and signals Latch and Print1 for the control of the pen driver board 11.
  • the printer controller 45 is connected to a corresponding control input of the DMA controller 43 and to the pixel data processing unit 41 via a control line for outputting the signal SO.
  • the cycle counter of the DMA controller 43 is a word counter for a predetermined number of 16-bit data words, which is started by a DMA start signal.
  • the DMA control is, for example, part of an application-specific circuit (ASIC), the cycle counter is connected on the one hand with the aforementioned means for generating and output of address write signals AW and the other with means for generating and output of selection signals, the latter - in a manner not shown - Have at least one output means and comparison means.
  • a first comparison means controls the output means as a function of the SO signal in order to reach a first predetermined number of 16-bit data words for the first pixel data processing unit 41 specific selection signal Sel_1.1 or Sel_1.2 and after reaching the first predetermined number of 16-bit data words to output a for the second pixel data processing unit 42 specific selection signal Sel_2.1 or Sel_2.2.
  • the first or second comparing means receives a signal which is applied to the cycle counter to terminate the counting of DMA cycles. From the signal, a DMA-busy signal with the value 'zero' is generated and output via a register.
  • DMA direct memory access
  • the binary pixel data are read from these latches in the order required by the printheads, collected in groups and then transferred by means of shift registers 414, 424 serially to the two printheads. At least one half of the print image column is printed by the first print head and at least one other half print image column is printed by the second print head.
  • the error-reducing encoder pulses logic 542 is a component of the printer controller 45 and the associated evaluation unit (not shown) forms part of the address generator 44.
  • the logic 542 then transmits a more than two-bit wide digital count signal ENC to the address generator 44 on the output side Comparator contains.
  • a data string counter is further realized (not shown in detail), wherein each data string has a maximum of the above-mentioned number of 40 * 16-bit data words. After the binary pixel data taken from a data string has been printed, the data string counter is incremented when the LH edge of the encoder clock occurs. When a predetermined setpoint U on data strings is reached, printing of the print image is ended.
  • the entire print data control can preferably be realized with an application specific circuit (ASIC) or programmable logic, such as Spartan II 2.5V FPGA from XILINX ( www.xilinx.com ).
  • FIG 4 shows a block diagram of the printer controller 45, which has a logic 542 for error reduction, which will be explained below with reference to FIG 6 in more detail.
  • the aforementioned logic 542 is operatively connected to a sequencer and processing unit 451 to which a printer control logic 450 and an input / output unit 454 are connected.
  • an encoder filter and an encoder controller included which provides a start signal for printing a column, an interrupt request with each rising edge of the encoder triggers and the correct time Transmission of print data within a print column supported.
  • the encoder filter suppresses spikes on the encoder signals.
  • the counter is a system clock for determining the period of encoder pulses is supplied.
  • the e-input BUS-I / O and other registers of the I / O unit 454 communicate with the microprocessor.
  • a microprocessor-controlled control of the pressure cycle duration causes - in a manner not shown - an adjustment of the printing cycle to a predetermined period of time, preferably about 90% of the time between two positive encoder edges.
  • the input / output unit 454 also has a number of blocks - not shown in detail - but at least the following blocks, a BUS input / output unit 4541, an input signal 4542 for the encoder signal e, an input 4543 for the DMA busy signal, a DMA start signal register 4544, an AG busy signal input 4545, an AG start signal register 4546, a switching signal SO register 4547, a PS signal input 4550; Output 4551 for the I signal, an output 4553 for the shift-clock signal, an output 4554 for the latch pulse signal, a Print1 pulse output 4555 and a Print2 pulse output 455x.
  • the input / output unit 454 has an ENC output 4560.
  • the evaluation unit 453 shown in dashed lines is likewise a component of the printer controller 45, then the output signal of the evaluation unit 453 is likewise transmitted to the address generator 44, but only as a bit-wide binary abort signal that is present at the output 4560 is provided.
  • the printer controller 45 can also be realized in the already explained or in an alternative embodiment, wherein each printer controller 45 - independent of the embodiment - has a data string counter 4503 and is connected to the encoder 3. After each printed data string, the value V of the data string counter is incremented when the encoder clock occurs, whereby the printing of the print image is terminated when a predetermined setpoint U of the data string counter is reached.
  • FIG. 5 shows a flowchart for the flow control of the printer controller.
  • a step 102 is reached and in routine 100 of the sequence control, the signals reduction signal DEC_ENC, reset signal Encoderfarer_Reset and selection signals Sel_1.1, Sel_1.2, Sel_2.1, Sel_2.2 are set to the value 'zero' .
  • a data word transmitted via the bus is evaluated with regard to the occurrence of a command for printing start. If the latter has not yet been issued, then it branches into a waiting loop.
  • the column count value V is set to the value 'zero'.
  • the switching signal SO is set to the value 'one' and output.
  • a second interrogation step 105 the encoder signal e is now evaluated with regard to the occurrence of an LH edge. If the latter has not yet occurred, a branch is made to a waiting loop.
  • a signal DMA start is output and a subroutine 300 is started which sets certain selection signals Sel_1.1, Sel_1.2, Sel_2.1 or Sel_2.2 to the value 'one' in order to convert the binary pixel data into the Latch the pixel data processing units 41 and 42 to take over what will be explained in more detail later with reference to FIG.
  • the DMA busy signal is now evaluated as to whether it has been set to the value 'zero'.
  • step 109 the digital output signal ENC of the encoder clock counter is evaluated with respect to a value deviating from the value 'zero'.
  • the printing cycle is set to a predetermined period of time between two positive encoder edges. This results in a distance between the individual pressure cycles due to the fourth interrogation step 109 (FIG. 1d).
  • step 111 the address generator is activated and a subroutine 400 is started, which generates for the pixel data processing units 41 and 42 specific read addresses AR and control signals such as the switching signal SO, the primitive address AP, the write signal WR and a load signal LD.
  • step 112 a DMA start signal is output and DMA control is enabled to restart the aforementioned subroutine 300. Both subroutines 300 and 400 are in parallel with each other.
  • the print cycle start is signalized by generating a short pulse or by setting the signal DEC_ENC to the value 'one' in a first substep 113a and the signal DEC_ENC to the value 'zero' in a second substep 113b.
  • a fifth interrogation step 114 it is evaluated whether the address generator has finished its subroutine 400 and whether the DMA busy signal has been set to the value 'zero'. If the former or the latter is still not the case, then a branch is made in a waiting loop. However, if the address generator has completed its subroutine 400 and the DMA busy signal has been set to the value 'zero', then a step 115 is reached.
  • a sixth interrogation step 116 it is evaluated whether the column count value V has reached a limit value U. If this is not the case, then the fourth query step 109 is branched back. Otherwise, the system branches back to the first interrogation step 103 via a step 117, and the routine restarts when a print start command is detected in the first interrogation step 103.
  • a reset signal Encoderschreiber_Reset: 0 is generated and reset the encoder counter to the value 'zero'.
  • the second block 452 which is operatively connected to the first block 451 of the printer controller 45 containing the sequence control and processing unit.
  • the aforementioned block 452 contains the logic for printer error reduction and is part of the printer controller 45.
  • the connection comprises a plurality of - not shown - lines for analog and / or digital electrical signals.
  • the connection of the second block 452 to the ENC output of the I / O unit 454 is also via the first block 451 of the printer controller 45.
  • the block 451 is connected to the I / O unit 454 of the printer controller 45. After powering up, the processing unit of the first block 451 sets the decrease signal DEC_ENC and the reset signal Encoder_counter_Reset to the value 'zero'.
  • the printer controller 45 includes a third block 450 with the printer control logic. The latter has parameter Y in parameter memory 4505 as an upper limit for the printer error reduction logic. Alternatively, a separate second block may be omitted (not shown) if the printer error reduction logic is part of the first block 451 of the printer controller 45.
  • FIG. 6 is a block diagram of the logic for printer error reduction shown.
  • First and second AND gates 4521, 4522 are output with the inputs of an encoder clock counter 4523 connected, having a first input CLK_down, a second input CLK_up and a third input ENC_RESET for the reset signal Encoderfarer_Reset has.
  • the decrease signal DEC-ENC becomes supplied via a first input of the first AND gate 4521.
  • With its second input is the output K of a first digital comparator 4524 connected.
  • the first digital comparator 4524 an OR gate, the digital output signal ENC of the encoder clock counter 4523 linked and at ENC ⁇ 0 output a logic signal 'one' on the output side.
  • the filtered encoder signal e is supplied in series via a first input of the second AND gate 4522, to whose second input the output L of a second digital comparator 4525 is connected.
  • the encoder clock counter 4523 is shown in the embodiment as a 4-bit counter, but should not be limited to this alone. Rather, embodiments other than n-bit counters are possible. In the preferred embodiment, both digital comparators are the same.
  • n Exclusive OR gates are linked together on the output side via an OR gate, wherein each Exclusive OR gate compares one digit of the n-bit number with a corresponding position of the n-bit comparison number.
  • first digital comparator 4524 is an n-bit wide digital data signal with the binary value 'zero'.
  • second digital comparator 4525 is an n-bit wide digital data signal with the corresponding binary values for an upper limit 'Y', which is supplied via the first block 451 of the printer controller 45.
  • the first block 451 of the printer controller 45 also provides the encoder count_reset signal and the DEC ENC signal.
  • the first digital comparator 4524 operates in a manner known per se and outputs a logic signal, for example TTL. For example, a binary value 'one' at the output K indicates that the condition ENC ⁇ 0 is fulfilled.
  • the DEC-ENC signal supplied via a first input of the first AND gate 4521 is consequently switched through to the first input CLK_down of the encoder clock counter 4523 in order to decrement the count value.
  • the second digital comparator 4525 outputs a logic signal having the binary value 'one' at the output L when the condition ENC ⁇ Y is satisfied.
  • the filtered encoder signal e supplied via a first input of the second AND gate 4522 is then turned on to the second input CLK_up of the encoder clock counter 4523 to increment the count value.
  • the first and second digital comparators 4524 and 4525 respectively output a TTL signal with the value 'zero' if the aforementioned respective condition is not fulfilled. In this case, the AND gates 4521 and 4522 are disabled.
  • FIG. 7 a shows a flowchart for reducing printer errors.
  • the routine 700 is started in step 701. After the start, first in step 702 the count is reset to the value 'zero'. In the following interrogation step 703, in the expectation of an activation by means of a reset signal encoder counter reset with the value 'one', the process is continuously branched back to step 702.
  • the reset signal encoder counter reset is set to the value 'one' after a first DMA cycle by the processing unit of the block 451 shown in FIG. 4, as can be seen from step 108 of FIG.
  • the aforesaid reset signal is applied to the third input ENC_RESET of the encoder clock count 4523 shown in FIG.
  • a second interrogation step 704 is reached in which it is determined whether an encoder LH edge is applied to the second AND gate 4522 via a first input while the second comparator 4525 outputs on the output side a value 'one', with which the latter signals that the condition ENC ⁇ Y is fulfilled.
  • the second query step 704 branches to the third query step 706.
  • the first comparator 4524 determines that the count ENC is not equal to the count value 'zero'. In this case, a branch is made to the fourth interrogation step 707. Otherwise, the first query step 703 is branched back.
  • the fourth interrogation step 707 it is checked whether the DEC ENC signal supplied via the first input of the first AND gate 4521 has the value 'one'.
  • FIG. 7b shows a pulse / time diagram for the printer error reduction.
  • the reset signal Encoder_excellenter_Reset and the decrease signal DEC_ENC are set to the value 'zero'.
  • Several encoder pulses occur in too short a time interval over a longer period of time. In the pulse / time diagram of Figure 7b, however, the aforementioned period is longer than in the pulse / time diagram of Figure 1f.
  • a first period begins at time t 0 to load the pixel data for the first print cycle into the latches via DMA cycles.
  • the output K of the first comparator 4524 (FIG. 6) then outputs the binary value 'one' which is applied to the input of the first AND gate 4521.
  • the output Q1 or K remain set to the binary value 'one' until the time t 3 .
  • the incrementing is continued as long as a predetermined upper limit Y is not reached, or the count value can be decremented upon the occurrence of a print cycle.
  • a second period is started with DMA cycles and a first print cycle for the pixel data of a data string loaded in the preceding first DMA period with DMA cycles.
  • a pulse-shaped decrease signal DEC_ENC generated by the printer controller 45 is output to the logic 452, resulting in decrementing and the result that the count value again has the value 'zero'.
  • the first-mentioned buffer of the print data controller 4 is read out for printing a data string.
  • the pixel data for a second print cycle are loaded by DMA into the respective other buffer of the print data controller 4.
  • a third encoder pulse already occurs before a third print cycle can be started.
  • the outputs Q1 and K remain set to the binary value 'one' until time t 5 .
  • a second print cycle and a third DMA period are started.
  • the time interval of the subsequent times t 6 and t 7 , t 8 and t 9 and t 10 and t 11 increases to the extent that at time t 11 of the seventh encoder pulse before the sixth DMA period is effective.
  • the encoder clock counter is no longer decremented to the same extent as it is incremented. As a result, the count increases.
  • the first comparator 4524 checks the aforementioned logic 452 as to whether the counter contents are nonzero. If this is the case, it is waited for a reduction signal DEC_ENC.
  • the printer controller outputs a decrease signal DEC_ENC.
  • the encoder clock counter is still incremented before decrementing.
  • the outputs Q1 and K remain set to the binary value 'one' from time t 10 to time t 11 and then change to the value 'zero'.
  • the output Q2 changes to the binary value 'one', ie the counter content has risen to the count value 'two' at time t 11 .
  • This counter state stops only until the time t 12 , since at the time t 11 also a reduction signal DEC_ENC with the value 'one' has been delivered to the encoder clock counter.
  • Output Q2 returns to binary 'zero' and output Q1 returns to binary 'one' according to the decremented 'one' count.
  • the eighth encoder pulse is output and there are comparable conditions as at time t 2 with the exception that the encoder clock count before incrementing is now at the aforementioned value 'one'.
  • the eighth encoder pulse at time t 13 is effective before the seventh DMA period with DMA cycles.
  • Output Q2 returns to binary 'one' and output Q1 returns to binary 'zero' according to the incremented count 'two'.
  • This counter state stops only until the time t 14 , since at the time t 13 also a decrementing signal DEC_ENC with the value 'one' was delivered to the encoder clock counter.
  • the address generator 44 in the subroutine 400 checks to see if the count has reached a set point Z. If this is the case and the data for the next print cycle is loaded into the buffer by DMA, the current print cycle is aborted. In FIGS.
  • a count value-which exceeds the setpoint value Z 1-causes the current print cycle at the seventh or seventh and eighth encoder impulses to be prematurely terminated by the region shown hatched and a new print cycle to begin.
  • the sixth print cycle is ended and a seventh print cycle begins. Therefore, a decrease signal DEC_ENC of value 'one' is output to the encoder clock counter, and the output Q1 returns to the binary value 'zero' corresponding to the decremented count value 'zero'. This counter state will only last until time t 16 , since the ninth encoder pulse has been delivered.
  • FIG. 8 shows a block diagram of an embodiment of the address generator.
  • the address generator 44 has an input / output logic 444, an evaluation unit 442 and a read address generation unit 441, the latter having a first counter 4410 for the primitive address and an associated first comparator 4411 for comparing a count value P of the primitive address with a first setpoint supplied by a first setpoint register 4412.
  • the unit 441 comprises a second counter 4413 for an address group and an associated second comparator 4414 for comparing a count A of the address group with a second set value supplied by a second setpoint register 4415 and a scheduler 4401.
  • the latter works in conjunction with a calculation unit 4402 for the parameter C, a WR signal generator 4403, an LD signal generator 4404, a PS signal generator 4405, with the aforementioned counters 4410 and 4413, with the comparators 4411, 4414, 4418, with the registers 4412, 4415 4417 and with a AG-busy buzzer 4416.
  • the evaluation unit 442 comprises an inverter 4420 for the DMA busy signal, an AND gate 4423, a register 4422 for at least a third setpoint value Z and a third comparator 4421 to which the count value of the encoder clock counter is supplied for comparison with at least one third setpoint Z. becomes.
  • the third comparator 4421 may be simply constructed by checking that neither ENC values are 'zero' nor 'one'. occur.
  • the logic signals output at the Q outputs of the encoder clock counter are linked via an OR gate and on the other hand n Exclusive OR gates on the output side via a second OR gate, whereby each Exclusive OR gate in each case has one position of the n-gate.
  • Bit number with a corresponding position of the n-bit comparison number of the setpoint Z 1 compares and the OR gate outputs are connected via an AND gate, which outputs the output signal of the third comparator 4421.
  • the AND gate 4423 outputs an abort signal BO having the value 'one' on the output side when the negated DMA busy signal and the output signal of the third comparator 4421 have the value 'one'.
  • the input / output logic 444 of the address generator 44 has an input 4450 for the DMA busy signal, an input 4451 for the ENC signal, an input 4444 for receiving the address generator start signal and a register 4445 for the signal to be sent Addressgeneratorbusysignal comprises.
  • the printer controller may already include the above-mentioned comparison of the ENC signal with the setpoint value Z, in order to generate an abort signal BO as a result of the comparison.
  • the I / O unit 454 of the printer controller 45 then includes a BO output instead of the ENC output 4560.
  • the input / output logic 444 of the address generator 44 need only contain a BO input instead of the ENC input 4451 which has the abort signal BO instead of the count ENC is supplied. This eliminates the control line 50, the DMA busy input 4450 and the evaluation 442 in the address generator 44.
  • a corresponding evaluation unit 453 is instead realized in the printer controller 45 to perform the above comparison of the ENC signal with the setpoint Z and the result the comparison to generate an abort signal for the printing cycle that is supplied to the address generator 44.
  • the address generator 44 After a formation of the address read signal AR and after an incrementation of a count value P for the primitive address by the value 'one', the comparison is made in the first comparator 4411, wherein after successively generates a number of read addresses, exceeding the first setpoint or an overflow of the Counter 4410 for the primitive address is triggered, a load signal LD is output and a subroutine for output is started, the counter 4413 for an address group is incremented by the value 'one', wherein falling below the second setpoint in the comparison in the second comparator 4414, a reset of the count value P of the primitive address to the value 'one' and generating a subsequent read address associated with a further address group and wherein upon the occurrence of a predetermined condition, a running print cycle is aborted prematurely.
  • the process controller 4401 is provided with a parameter C calculating unit 4402 having a signal generator 4403 for generating a write signal WR, a signal generator 4404 for generating a load signal LD, and another signal generator 4405 for generating a print start signal PS to cause the pixel data to be printed out a data string and connected to the busy signaling device 4416.
  • the input / output logic 444 also has a register 4446 for the delivery of the primitive address AP, a register 4447 for the write signal WR, a register 4448 for the load signal LD, a register 4449 for the output of the address read signal AR and a register 4440 for the output of the Pressure start signal PS on.
  • FIG. 9 shows a block diagram of a DMA controller.
  • the DMA controller 43 has at least one scheduler 4301, a word counter 4302, a setpoint register 4303, an input / output logic 4304, a memory 4305, a comparator 4306, and a shift register 4307, which are interconnected to perform DMA cycles.
  • Integrated into the flow control 4301 is a further processing unit to which the aforementioned blocks 4302 to 4307 are connected in circuit and which has further comparators (not shown).
  • the input / output logic 4304 at least one input 43042 for the received DMA start signal and Registers 43043 to 43046 for the select signals to be transmitted, a DMA busy signal register 43047, a request signal DMA REQ register 43048, an input acknowledgment signal DMA ACK input 43049, an input 43050 for the switching signal (SO) and register 43051 for the address write signal AW.
  • FIG. 10 shows a flowchart for DMA control.
  • a subroutine 300 is called when a DMA start signal is output from the printer controller 45 to the DMA controller 43 (step 301).
  • a word count W is set to the value 'zero'.
  • a DMA-busy signal is set to the value 'one' and transmitted to the printer controller 45.
  • a DMA request signal DMA REQ having a value 'zero' is transmitted to the microprocessor 6. The latter transmits an acknowledgment signal DMA ACK to the DMA controller 43.
  • a non-receipt of the acknowledgment signal DMA ACK branches to a waiting loop with a value 'zero'.
  • a value 'zero' is jumped to a second interrogation step 305, the state of the switching signal SO being determined. If the switching signal SO has the state equal to one, then a branch is made to a third interrogation step 306. Otherwise, the switching signal SO has the state equal to 'zero' and a branch is made to a fourth interrogation step 309.
  • step 306 it is checked whether the word counter has a value W smaller than twenty. For this case (W ⁇ 20), a branch is made to a step 307.
  • step 307 the first selection signal for the first print head Sel_1.1. switched to the value 'one' and the address write signal AW receives the current value W of the word counter.
  • step 312 the pixel data are transferred to the latches of the pixel data modification units 41, 42.
  • step 313 all selection signals are switched to the value 'zero' and a DMA request signal DMA REQ with a value 'one' is transmitted to the microprocessor 6.
  • step 314 the word count W is incremented with the value 'one'.
  • a subsequent query step 315 it is checked whether the word counter has a value W less than forty. For this case, in which the word counter has such a value W ⁇ 40, a branch back to a step 303. Otherwise, a branch is made to a step 316 to output a signal DMA busy having the value 'zero' before the end (step 317) of the subroutine 300 is reached. Otherwise, if it is determined in the third query step 306 that the word count W is not less than twenty, then a branch is made to a step 308 in which the first selection signal for the second print head Sel_2.1. is switched to the value 'one' and the address write signal AW is replaced by the value 'twenty' reduced current value W of the word counter.
  • the pixel data are taken back into the buffer.
  • the word counter has the predetermined value W ⁇ 20, it being previously determined in the interrogation step 305 that the binary switching signal SO does not have the value equal to one. If the word counter has the predetermined value W ⁇ 20, then in step 310, the second selection signal for the first printhead Sel_1.2. switched to the value 'one' and the address write signal AW receives the current value W of the word counter.
  • the pixel data are taken back into the buffer.
  • the fourth interrogation step 309 branches to a step 311 in which the second selection signal for the second printhead Sel_2.2 is switched to the value 'one' and the address write signal AW the by the value 'Twenty' reduced actual value W of the word counter receives.
  • the pixel data are taken back into the buffer.
  • FIG. 11 shows a flowchart for address generation.
  • the addresses of stored binary pixel data begin at both printheads with the start address zero, which is generated in the following manner for the address read signal AR.
  • the first query step 403 it is asked if the numerical value P of the counter of the primitive address is equal to the value one. If so, the second query step 404 is reached. Here it is determined whether the counter A has reached the value 8 or 9 or 15 or 16.
  • step 406 is executed and the numerical value C is subtracted from the numerical value C of the counter of the address read signal AR.
  • the numerical value C of the counter of the address read signal AR is greater than or equal to the value zero and then branches to step 419 for the output of the address read signal AR. Otherwise, a branch is made to step 420 in order to add a numerical value 512 to the negative numerical value.
  • steps 419 and 420 steps 425, 426 and 427 are traversed.
  • step 425 the numerical value for the counter of the primitive address AP is output.
  • step 426 a write signal WR for the binary pixel data entry is output to a collection register.
  • step 427 the numerical value for the numerator of the primitive address AP is incremented by the value one. Then, a fourth interrogation step 428 is reached and it is determined that the numerical value P of the counter of the primitive address AP has not yet reached the limit value 15. Subsequently, branching back to the first query step 403. In the first query step 403, it is now determined that the numerical value P of the counter of the primitive address is not equal to the value one and branches to the fifth interrogation step 407. If the numerical value P is odd, then the program branches to the sixth query step 408, in which it is checked whether the counter of the address group has the value 8 or 15.
  • a branch is made to a step 409 and the numerical value 3 is added to the numerical value C of the counter of the address read signal AR. Otherwise, branching is made from the sixth interrogation step 408 to a step 410, and the numerical value 47 is added to the numerical value C of the counter of the address read signal AR. If, however, the numerical value P is even, then the fifth query step 407 branches to the seventh query step 415, in which it is checked whether the counter of the address group has the value 8 or 15. If this is the case, then a branch is made to a step 416 and the numerical value 41 is added to the numerical value C of the counter of the address read signal AR.
  • a branch is made from the seventh interrogation step 415 to a step 417 and the numerical value C is subtracted from the numerical value C of the counter of the address read signal AR.
  • the third interrogation step 418 is reached again and it is determined whether the numerical value C of the counter of the address read signal AR is greater than or equal to the value zero.
  • steps 425, 426 and 427 are again run until the fourth interrogation step 428 is reached, in which it is determined whether the numerical value P of the counter of the primitive address AP has already reached the limit value 15.
  • a branch is made to a step 429 and a charging signal for loading the shift register is output.
  • a subroutine 500 is started in step 430 in which, inter alia, a shift clock signal SCL is applied to the shift register in order to serially output the pixel data from the latter.
  • step 431 the value of the counter of the address group is incremented by the value one.
  • an eighth query step 432 is reached in which it is determined whether the numerical value A of the counter of the address group has already reached the limit value 23.
  • a ninth query step 433 is reached, in which it is determined whether the DMA busy signal with the value 'zero' already exists and whether the numerical value ENC of the counter of the address group exceeds the third setpoint Z. If this is not the case, then the first query step 403 branches back. If, however, the third setpoint value Z is exceeded, then a signal AG-busy 0 is output in step 434 and the subroutine 400 is stopped in step 435. In an alternative variant, with a corresponding evaluation circuit in the printer controller 45, need only be determined in the ninth query step 433, whether an abort signal already exists.
  • FIG. 12 shows a table for generating addresses, whose address read signals AR for 22 address groups are generated by the aforementioned routine 400.
  • the address generator 44 preferably generates the address values as a binary number and applies them to the pixel data processing units 41, 42.
  • a binary number may be represented as a hexadecimal number or a decimal number, which requires less space. Only for this reason and for better understanding are decimal numbers entered in the table.
  • the address read signal AR (address read) is thus generated for 14 binary numbers per address group. One after the other corresponding binary numbers are generated as address read signal AR for 22 address groups. Each address read signal AR is used to access a binary pixel data in the buffer.
  • the address values greater than 500 must therefore not be able to be generated completely as a binary number. To provide binary pixel data, all address values greater than 299 are generated but also not needed for printing.
  • Routine 400 is executed until all print image columns have been printed or aborted. It has already been explained that the rows of nozzles of a printhead become active alternately for printing image columns. While one of the latches is being loaded with binary pixel data via direct memory access, the other latches are read out to transfer rendered groups of binary pixel data to the driver units. The mutual repetition of the routine 400 and further subsequent steps are caused by the printer controller 45, which under the control of a signal e of the encoder 3 also generates the print signals Print 1 or Print 2.
  • FIG. 13 shows a flowchart of the output routine 500.
  • the address generator 44 outputs a print start signal PS to the printer controller 45.
  • the issue routine is called twenty-two times as a subroutine in the course of subroutine 400 to drive the shift registers in the print data controller 41, 42 and around the driver units 11, 12.
  • a step 502 is reached and a shift clock SCL is generated in order to shift the pixel data loaded in the shift register via the serial data output to the respective drive unit 11, 12.
  • step 503 a latch signal is generated and output to the driver units 11, 12.
  • step 504 the print signals Print1, Print2 are generated and output to the driver units 11, 12, and in step 505, the subroutine 500 is stopped.
  • each data string exists a first and second number of data words, respectively, containing binary pixel data for a first and a second inkjet printhead 1, 2, respectively.
  • Each inkjet printhead 1, 2 prints one-half of each print image column, with odd-numbered pixels on at least one half of a first print image column and even-numbered pixels on at least one half through the first and second nozzle rows of each inkjet printhead a second printed image column to be printed.
  • the first or second number of data words in the data string respectively contain the binary pixel data for both nozzle rows of the first and second inkjet printhead, wherein in each data word of each data string only the first and second pixel data are contained for printing a first or further print image column, so that one of the print image columns is completely printed only after printing out the pixel data, for example, three data strings or at least one further data string.
  • the row of nozzles respectively in the transport direction in the first direction is supplied with the binary pixel data for the odd-numbered pixels of the first print image column, while the nozzle row in the transport direction in the second direction is already supplied with the binary pixel data for the even-numbered pixels the subsequent further print image column is supplied.
  • Each print image column half is printed by the first and second nozzle rows of each ink jet print head, each print image column half being completed in time after printing with the second nozzle row by printing with the respective first nozzle row.
  • the first print image column is thus printed at a distance from the second print image column in the transport direction, with both print image columns being further in some print head types and very close to each other in other types.
  • To increase the horizontal print image resolution, in particular to 600 dpi it is provided that within the distance further print image columns are in the transport direction. This increases accordingly the number U of data strings which are stored in the pixel memory for a print image.

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Claims (10)

  1. Procédé de réduction d'erreurs d'impression, durant l'impression sur un envoi postal en mouvement dans une machine d'usinage postale, caractérisé selon les étapes suivantes :
    a) Production d'impulsions de codage selon le mouvement apparent entre l'imprimante et le cylindre porte-plaque,
    b) Comptes positif et à rebours pour l'évaluation d'un état avec des intervalles périodiques moindres des impulsions de codage contiguës
    c) Organisation des accès directs à la mémoire (DMA) pour une chaíne de caractères de données des données pixel et
    d) Organisation d'un cycle d'impression pour la chaíne de caractères de données mentionnée ci-dessus, tandis que, durant le cycle d'impression, s'effectuent d'autres accès directs à la mémoire (DMA), destinés à une prochaine chaíne de caractères de données et tandis que, après l'organisation des accès directs à la mémoire (DMA), en vue d'une prochaine chaíne de caractères de données et, dépendamment de l'intervalle périodique entre deux impulsions de codage, un nombre d'impulsions successives de codage du cycle d'impression est exécuté entièrement, aussi longtemps que la valeur moyenne de la période de codage demeure en deçà de la durée déterminée d'un cycle d'impression ou, tandis que, lors d'un intervalle périodique moindre entre deux impulsions de codage du nombre d'impulsions de codage, l'organisation du cycle d'impression pour le tirage de données pixel binaires d'une chaíne de caractères de données précédente est interrompue prématurément.
  2. Procédé, selon la spécification 1, caractérisé en ce que, l'intervalle entre deux cycles d'impression est abaissé l'un par rapport à l'autre, dépendamment de l'intervalle périodique moindre des impulsions de codage à un nombre d'impulsions de codage, jusqu'à ce que le cycle d'impression suivant en vue du tirage de données pixel binaires d'une chaíne de caractères de données subséquente soit immédiatement branché à un cycle d'impression s'effectuant complètement pour le tirage de données pixel binaires d'une chaíne de caractères de données antérieure, tandis que, l'abaissement s'ensuit au fur et à mesure que les impulsions de codage règlent préalablement le cycle d'impression.
  3. Procédé, selon la spécification 1, caractérisé en ce que, pour un intervalle périodique non abrégé entre deux impulsions de codage, un réglage du cycle d'impression sur une durée prédéterminée entre deux flancs d'impulsion de codage positifs s'effectue de telle manière que, les différents cycles d'impression sont placés par intervalle les uns par rapport aux autres et que, pour la détermination d'un intervalle périodique abrégé entre deux impulsions de codage, un accroissement d'une valeur numérique, lors de chaque impulsion de codage, et un décroissement de la valeur nominale, à chaque début d'un cycle d'impression, sont prévus ainsi que, d'un côté dans cette condition et d'un autre côté lors d'une valeur nominale, qui dépasse la valeur théorique (Z) prédéterminée, le cycle d'impression en cours est interrompu prématurément et un nouveau cycle d'impression commence, tandis que, la condition susmentionnée consiste en ce que, tous les accès directs à la mémoire (DMA) cessent sur la mémoire pixel (7), lesquels préparent le prochain cycle d'impression.
  4. Dispositif de réduction d'erreurs d'impression lors du tirage dans une machine d'usinage postale, avec une commande des données d'impression (4), en vue d'une préparation de données pixel durant l'impression sur un envoi postal en mouvement avec au minimum une tête d'imprimante, qui est connectée au moins avec un microprocesseur (6), avec une mémoire pixel (7) et avec un codeur (3) par un bus (5), caractérisé en ce que, la commande des données d'impression (4) présente une unité d'évaluation (442 ou selon le cas 453) et une logique (452) en vue de la réduction d'erreurs de fautes d'impression, auxquelles sont conduites des impulsions de codage (e) et, qui comporte un compteur d'impulsions de codage d'horloge (4523) pouvant être réinitialisé, dont la valeur nominale est incrémentée dans une échelle de chiffres d'une petite jusqu'à l'obtention d'une valeur limite (Y) supérieure similaire avec chaque partie croissante d'une impulsion de codage, dont la valeur nominale est décrémentée à chaque début de cycle d'impression et, qui donne à la sortie une valeur nominale (ENC) digitale, tandis que, cette dernière de l'unité d'évaluation (442 ou selon le cas 453) est exploitée, quant au dépassement d'une valeur théorique (Z), tandis que, lors d'un non dépassement de la valeur théorique (Z), chaque cycle d'impression est effectué entièrement et, lors d'un dépassement de la valeur théorique (Z), un cycle d'impression en cours est interrompu à condition que, tous les accès directs à la mémoire (DMA) cessent sur la mémoire pixel (7), lesquels préparent le prochain cycle d'impression.
  5. Dispositif, selon la spécification 4, caractérisé en ce que, la commande des données d'impression (4) présente une commande DMA (43), un programme générateur d'adresses (44), une commande de l'imprimante (45) et la logique (452) pour la réduction d'erreurs de fautes d'impression, les impulsions de codage (e) sont conduites, et qui donne à la sortie une valeur nominale (ENC) digitale à un programme générateur d'adresses (44). Dispositif, caractérisé en ce que le programme générateur d'adresses (44) présente une unité d'évaluation (442) pour l'interruption d'un cycle d'impression en cours, tandis qu'une unité d'évaluation (442) comprend un comparateur (4421) et un registre (4422) pour la mise en mémoire de la valeur théorique (Z).
  6. Dispositif, selon les spécifications 4 à 5, caractérisé en ce que, la logique (452) pour la réduction d'erreurs de fautes d'impression comprend un compteur d'impulsions de codage d'horloge (4523) pouvant être réinitialisé, dont la valeur numérique est incrémentée dans une échelle de chiffres d'une petite jusqu'à l'obtention d'une valeur limite (Y) supérieure similaire avec chaque partie croissante d'une impulsion de codage, dont la valeur nominale est décrémentée à chaque début de cycle d'impression et, dont les sorties sont connectées à un premier comparateur (4524), lequel empêche la décrémentation, lors de l'obtention de la valeur numérique neutre, avec un deuxième comparateur (4525), qui contrôle l'obtention de la valeur limite (Y) supérieure et fournit du côté de la sortie la valeur numérique correspondante et qui reste en connexion de service avec le programme générateur d'adresses (44), tandis que ce dernier interrompt le cycle d'impression en cours lorsque, toutes les données pixel pour le prochain cycle d'impression, via des accès directs à la mémoire (DMA), ont déjà été chargées dans une mémoire intermédiaire d'une unité de préparation de données pixel (41, 42) et qu'il dépasse une valeur théorique (Z) prédéterminée dans une échelle de chiffres comportant la valeur nominale du compteur d'impulsions de codage d'horloge.
  7. Dispositif, selon les spécifications 4 à 6, caractérisé en ce que, la logique (452) en vue d'une réduction d'erreurs d'impression présente une première et une deuxième grille AND (4521, 4522), qui sont en connexion avec les entrées d'un compteur d'impulsions de codage d'horloge (4523) en situation initiale que, le compteur d'impulsions de codage d'horloge (4523) présente une première entrée (CLK_down), une deuxième entrée (CLK_up) et une troisième entrée (ENC_RESET) pour un signal de réinitialisation (compteur de codage_Reset), qu'un signal de diminution (DEC-ENC) est amené par une première entrée de la première grille AND (4521), avec laquelle la sortie (K) du premier comparateur digital (4524) est connectée à une deuxième entrée, qu'un signal de codage (e) est acheminé en série à travers une première entrée de la deuxième grille AND (4522), avec laquelle la sortie (L) du deuxième comparateur digital (4525) est connectée à une deuxième entrée, que la valeur nominale est adjacente à chaque fois aux premières entrées des premier et deuxième comparateurs (4524, 4525), qui est émise aux sorties (Q1, Q2, Q3, Q4) du compteur d'impulsions de codage d'horloge (4523) comme large valeur binaire en-bit et qu'une valeur comparative 'neutre' adhère aux deuxièmes entrées du premier comparateur digital (4524) et qu'une valeur théorique (Y) supérieure comme large signal de données en-bit est adjacente aux deuxièmes entrées du second comparateur digital (4525).
  8. Dispositif, selon les spécifications 4 à 7, caractérisé en ce que, le compteur d'impulsions de codage d'horloge (4523) est utilisé comme un compteur en-bit.
  9. Dispositif, selon les spécifications 4 à 7, caractérisé en ce que, un signal de codage (e) filtré, le signal de réinitialisation (compteur de codage_Reset) et le signal de diminution (DEC-ENC) ainsi que la valeur théorique (Y) supérieure sont fournis par un premier bloc (451) de la commande d'impression (45) de la commande de données d'impression (4).
  10. Dispositif, selon les spécifications 4 à 9, caractérisé en ce que, la commande des données d'impression (4) est réalisée comme un circuit spécifique à l'application ou selon le cas comme une logique programmable.
EP03090193A 2003-06-27 2003-06-27 Méthode et système pour réduire les erreurs d'impression dans un appareil de traitement de courrier Expired - Lifetime EP1491347B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT03090193T ATE307032T1 (de) 2003-06-27 2003-06-27 Verfahren und anordnung zur reduzierung von druckerfehlen während des drukens in einem postbearbeitungsgerät
EP03090193A EP1491347B1 (fr) 2003-06-27 2003-06-27 Méthode et système pour réduire les erreurs d'impression dans un appareil de traitement de courrier
DE50301430T DE50301430D1 (de) 2003-06-27 2003-06-27 Verfahren und Anordnung zur Reduzierung von Druckerfehlen während des Drukens in einem Postbearbeitungsgerät
DK03090193T DK1491347T3 (da) 2003-06-27 2003-06-27 Fremgangsmåde og anordning til reduktion af trykfejl i et postbearbejdningsapparat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03090193A EP1491347B1 (fr) 2003-06-27 2003-06-27 Méthode et système pour réduire les erreurs d'impression dans un appareil de traitement de courrier

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EP1491347A1 EP1491347A1 (fr) 2004-12-29
EP1491347B1 true EP1491347B1 (fr) 2005-10-19

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Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5912979A (en) * 1990-11-02 1999-06-15 Bell & Howell Mail Processing Systems Co. Method and apparatus for object surveillance along a transport path
US5337248A (en) * 1992-02-25 1994-08-09 Pitney Bowes Inc. Mailing machine including sheet feeding speed calibrating means
DE29716523U1 (de) * 1997-09-05 1997-11-20 Francotyp-Postalia AG & Co., 16547 Birkenwerder Frankiermaschine
DE10032855A1 (de) * 2000-07-06 2002-01-17 Francotyp Postalia Gmbh Vorrichtung zum Bedrucken eines Druckträgers
DE10036345B4 (de) 2000-07-26 2005-07-07 Francotyp-Postalia Ag & Co. Kg Anordnung und Verfahren zur Datennachführung für Aufwärmzyklen von Tintenstrahldruckköpfen
US6457901B1 (en) 2000-09-01 2002-10-01 Precision Cover Systems, Inc. Adjustable manhole apparatus
DE10060454A1 (de) * 2000-11-28 2002-05-29 Francotyp Postalia Gmbh Anordnung für eine Druckvorrichtung
DE10230679A1 (de) 2002-07-04 2004-01-22 Francotyp-Postalia Ag & Co. Kg Verfahren zum Steuern des Druckens in einem Postbearbeitungsgerät
DE10230678A1 (de) 2002-07-04 2004-03-25 Francotyp-Postalia Ag & Co. Kg Anordnung zum Steuern des Druckens in einem Postbearbeitungsgerät

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ATE307032T1 (de) 2005-11-15
EP1491347A1 (fr) 2004-12-29
DK1491347T3 (da) 2006-03-06
DE50301430D1 (de) 2006-03-02

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