EP0140389A2 - Méthode et appareil pour réduire le déport d'impression dans une imprimante matricielle bi-directionnelle - Google Patents

Méthode et appareil pour réduire le déport d'impression dans une imprimante matricielle bi-directionnelle Download PDF

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Publication number
EP0140389A2
EP0140389A2 EP84113155A EP84113155A EP0140389A2 EP 0140389 A2 EP0140389 A2 EP 0140389A2 EP 84113155 A EP84113155 A EP 84113155A EP 84113155 A EP84113155 A EP 84113155A EP 0140389 A2 EP0140389 A2 EP 0140389A2
Authority
EP
European Patent Office
Prior art keywords
print
clock
pressure
printing
cycles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84113155A
Other languages
German (de)
English (en)
Other versions
EP0140389B1 (fr
EP0140389A3 (en
Inventor
Hermann Dipl.-Ing. Ullenboom
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0140389A2 publication Critical patent/EP0140389A2/fr
Publication of EP0140389A3 publication Critical patent/EP0140389A3/de
Application granted granted Critical
Publication of EP0140389B1 publication Critical patent/EP0140389B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/14—Character- or line-spacing mechanisms with means for effecting line or character spacing in either direction
    • B41J19/142—Character- or line-spacing mechanisms with means for effecting line or character spacing in either direction with a reciprocating print head printing in both directions across the paper width
    • B41J19/145—Dot misalignment correction

Definitions

  • the invention relates to a method for reducing the pressure offset in bidirectionally printing matrix printing devices according to the preamble of claim 1, and an arrangement for performing the method.
  • Printheads from matrix printers are known to have printing elements, for example needles, which are arranged in one or more rows.
  • the control of the individual printing elements with information contained in a character generator takes place in columns, i.e. after the printhead has moved a column distance, the printhead is fed a column and print cycle.
  • the pressure cycle thus determines the time of actuation of the pressure elements. In this way, each character can be built up in a grid pattern on the record carrier.
  • the printing processes always take place during the movement of the print head at a constant speed.
  • the formation of the print cycle can take place by scanning a so-called printer carriage carrying the print head or the drive device driving it. In particular, this is done by deriving the pressure clocks from the scanning clocks formed in the scanning device, which is generally implemented by an optically scanned clock disk or clock ruler.
  • a so-called PLL module can be used which, while largely maintaining the phase relationship, the sampling clock applied to the input implements a higher-frequency output clock. The output clock can then be used in a pressure clock to form the pressure clock.
  • This clock generation which is known for matrix printers, makes it possible to determine the print cycles of a character or the print cycles of an entire print line by counting the print cycles, starting from the start of printing, ie beginning at the beginning of the line. This is important insofar as the movement of the printer carriage must be braked and then accelerated again in the other direction of movement. As mentioned above, the print cycles are only available during the constant movement of the printer carriage. The sampling clocks are therefore used during the deceleration and acceleration phases, ie they are counted here.
  • the object of the invention is to avoid such a printing offset in the case of bidirectionally printing matrix printers.
  • FIG. 1 The illustration in FIG. 1 is based on a mosaic printing device in which a scanning clock AT, a control clock ST and a printing clock DT are formed when the printer carriage carrying a print head is moved along a write line.
  • the sampling clock AT, the control clock ST and the pressure clock DT are shown in lines 1, 2 and 3 in FIG. 1.
  • the sampling clock AT is formed by the scanning of the printer carriage carrying the print head or by the scanning of a clock disk connected to the drive, for example to the drive motor.
  • the frequency of sampling AT during the acceleration phase increases constantly until the printer carriage required for printing Ge - speed has reached-. This point in time and thus the position of the printer carriage is known Determined by counting the sampling clocks in a counter.
  • control clock ST are available from time t1 and are generated, for example, in a PLL circuit known per se.
  • the control clock ST has an 8 times higher frequency than the scanner AT.
  • the pressure cycle DT in turn is formed by dividing the control cycle ST by a factor of 3 in the example.
  • the column clocks required for character printing in a writing line are output for the printhead, it being assumed for this example that 32 column clocks are required to represent each character. Accordingly, the print cycle DT32 of the last character in a line is also the last print cycle of this line.
  • the rising edge of the next following sampling cycle AT for initiating the braking process for the printer carriage is evaluated.
  • the required number of sampling clocks AT is counted.
  • the processes described above run again until the printer carriage has reached the prescribed speed again and the printing cycles for the printing process are output in the reverse direction.
  • the last pressure clock DT32 can be in the immediate vicinity of a flank of the Sampling clock AT occur and lie once shortly before, another time shortly thereafter. That means that the pressure an error occurs when switching from the counting of the printing clocks to the counting of the sampling clocks, which may include a clock period of the sampling clock. This error manifests itself in a clearly visible print offset, ie the typeface looks very irregular. In the case of printing over several lines, this can even lead to a loss of information, if the printing operations are outside the limits of the recording medium.
  • Such a shifted last print cycle DT32 has been entered in dashed lines in FIG. 1.
  • the printer carriage would continue to run at a constant speed during the scanning cycle following the last printing pulse, and the braking processes would be initiated late by an entire scanning cycle period.
  • the idle cycles are also taken into account.
  • the previously added empty print clocks DTL1 and DTL2 are first inserted again, so that the print begins in the reverse direction at the point at which the last character of the previous line was printed.
  • FIG. 3 A possible exemplary embodiment for carrying out the invention is shown in FIG. 3.
  • the drive system for the printer carriage DR basically consists of a motor M, which can be switched in its direction of movement.
  • the drive system is assigned a scanning device AS, which is designed, for example, in the form of a clock disc, the opaque and translucent Be rich can be scanned using an optoelectronic device.
  • the scanning clocks AT formed in this way represent the information required for determining the movement of the printer carriage.
  • the control clocks ST and the printing clocks DT are generated in a manner known per se by means of counting and clocking units.
  • this is a first counter Z1, to which the sampling clocks AT are available.
  • the control clock ST is formed in a control clock generator STG, which is implemented by a so-called PLL circuit, from the sampling clocks AT.
  • the higher-frequency control clock ST arrives in a pressure clock generator DTG, from which the actual pressure clocks DT are emitted.
  • DTG pressure clock generator
  • the counters Zl and Z2, as well as the pressure clock DTG exchange control criteria S 1 to S 5 with a control part S.
  • the individual tax criteria are as follows.
  • the control signal S1 is given to the counter Zl, which then counts the sampling clock AT required for the acceleration of the printer carriage. If the printer carriage DR has reached the prescribed speed, ie if the counter Z1 has reached a prescribed counter reading, then the control signal S2 is output to the controller S. Thereupon the control clock generator STG and the pressure clock generator DTG are now switched on by means of the control signals S3 and S4, and the second counter Z2 is switched on by means of the control signal S5.
  • the pressure clock DTG to which the control clock ST is available, then forms pressure clocks DT in accordance with the structure and mode of operation of the matrix printer.
  • the counter Z2 If the counter Z2 has recognized the last print cycle DT32 of a line, it outputs the control signal S6 to the controller S. The latter reacts to this in such a way that the control clock generator STG, the print cycle, is switched off DTG encoder and the activation of the counter Zl is delayed.
  • the pressure clock generator DTG continues to output pressure clocks after the recognition of the last pressure clock DT32, but as empty pressure clocks DTL1, DTL2 this does not lead to an impression on the recording medium P.
  • the control signal S3 is switched off by the control S and the control signal S1 is switched on again. This means that no more printing clocks are now being issued and that the counter Z1 counts the sampling clocks AT again.
  • the printer carriage DR has once again reached the prescribed speed, ie if the counter reading of the counter Z1 corresponds to the prescribed value again, the control signal S2 is output to the controller S.
  • the control clock generator STG and the pressure clock generator DTG are switched on by the control signals S3, S4 in order to emit the corresponding number of idle pressure cycles. If these have been transferred to the print head, the counter Z2 is switched on and the subsequent print cycles are evaluated in the print head for the representation of characters and at the same time counted in the counter Z2. If the last print cycle of the line is determined in this way, the processes described run again.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Dot-Matrix Printers And Others (AREA)
EP84113155A 1983-11-03 1984-10-31 Méthode et appareil pour réduire le déport d'impression dans une imprimante matricielle bi-directionnelle Expired - Lifetime EP0140389B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833339787 DE3339787A1 (de) 1983-11-03 1983-11-03 Verfahren und anordnung zur reduzierung des druckversatzes in bidirektional druckenden matrixdruckeinrichtungen
DE3339787 1983-11-03

Publications (3)

Publication Number Publication Date
EP0140389A2 true EP0140389A2 (fr) 1985-05-08
EP0140389A3 EP0140389A3 (en) 1988-01-20
EP0140389B1 EP0140389B1 (fr) 1990-03-07

Family

ID=6213375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113155A Expired - Lifetime EP0140389B1 (fr) 1983-11-03 1984-10-31 Méthode et appareil pour réduire le déport d'impression dans une imprimante matricielle bi-directionnelle

Country Status (4)

Country Link
US (1) US4603984A (fr)
EP (1) EP0140389B1 (fr)
JP (1) JPS60110461A (fr)
DE (2) DE3339787A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0290219A2 (fr) * 1987-05-02 1988-11-09 Brother Kogyo Kabushiki Kaisha Dispositif pour la commande du mouvement du chariot dans une imprimante

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6490761A (en) * 1987-10-01 1989-04-07 Citizen Watch Co Ltd Printer control system
JP2720012B2 (ja) * 1993-09-27 1998-02-25 ブラウン ポール−ビルヘルム エンコーダ
JPH10157203A (ja) * 1996-11-29 1998-06-16 Hitachi Koki Co Ltd ドットプリンタのシャトル制御方式
GB9902058D0 (en) 1999-01-29 1999-03-24 Neopost Ltd Alignment of imprints

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970183A (en) * 1974-06-05 1976-07-20 Centronics Data Computer Corporation Random access line printer
US4208137A (en) * 1978-01-16 1980-06-17 Ncr Corporation Position sensing for matrix printer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970183A (en) * 1974-06-05 1976-07-20 Centronics Data Computer Corporation Random access line printer
US4208137A (en) * 1978-01-16 1980-06-17 Ncr Corporation Position sensing for matrix printer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0290219A2 (fr) * 1987-05-02 1988-11-09 Brother Kogyo Kabushiki Kaisha Dispositif pour la commande du mouvement du chariot dans une imprimante
EP0290219A3 (en) * 1987-05-02 1990-07-04 Brother Kogyo Kabushiki Kaisha Carriage movement control in a printer

Also Published As

Publication number Publication date
EP0140389B1 (fr) 1990-03-07
US4603984A (en) 1986-08-05
DE3339787A1 (de) 1985-05-15
JPS60110461A (ja) 1985-06-15
EP0140389A3 (en) 1988-01-20
DE3481494D1 (de) 1990-04-12

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