EP0055325B1 - Druckersteuerung mit Zeitgeberscheibe - Google Patents

Druckersteuerung mit Zeitgeberscheibe Download PDF

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Publication number
EP0055325B1
EP0055325B1 EP81107090A EP81107090A EP0055325B1 EP 0055325 B1 EP0055325 B1 EP 0055325B1 EP 81107090 A EP81107090 A EP 81107090A EP 81107090 A EP81107090 A EP 81107090A EP 0055325 B1 EP0055325 B1 EP 0055325B1
Authority
EP
European Patent Office
Prior art keywords
phase
signals
circuit
energization
starting point
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
Application number
EP81107090A
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German (de)
English (en)
French (fr)
Other versions
EP0055325A1 (de
Inventor
Robert Frederick Knapp
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.)
International Business Machines Corp
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International Business Machines Corp
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Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0055325A1 publication Critical patent/EP0055325A1/de
Application granted granted Critical
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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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • 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

Definitions

  • the invention relates to a method and an arrangement for determining the firing times in line printers of the type referred to in the preamble of claim 1.
  • the characters of a print line are formed from a matrix of selectively arranged dots, which are generated on the recording medium by selectively excited printing elements.
  • These printing elements can be printing wires or electrodes (discoloration of the recording surface due to heat or removal of parts of a surface layer by electroerosion).
  • the point in time when the printing elements are excited must be observed precisely in order to allow successive dots to follow one another exactly.
  • the pressure elements are often operated in the forward and reverse directions; therefore the timing must work in both directions.
  • corresponding output signal sequences from two transducers are logically combined in order to determine the direction of movement of the print head.
  • the control signals for the printing elements are generated on every flank of a pulse in every pulse train.
  • transducers are likewise arranged relative to one another in a track of alternating transparent and opaque cutouts in order to generate pulse sequences shifted by 90 ° so as to determine the direction of movement.
  • the timing signals for the printing elements are only generated by the leading edge of the pulses of only one of the two pulse trains.
  • the polarity of the impulses (timing signals) for the forward and return of the printhead, which cause the firing times, should remain the same and a simple construction and greater freedom from maintenance should be achieved.
  • the print element is energized as the print head moves along the print line.
  • phase A and B in FIG. 3 By combining both signal forms (phases A and B in FIG. 3) by means of an antivalence circuit, taking into account a direction signal for the forward and return, the timing signals on the leading and trailing edges of the signals are generated in only one of the signal forms (phase A or phase B) , so that the 90 ° phase shift remains important, but is no longer as critical as in previous systems.
  • This advantage enables the support block for the transducers (scanning station) to be cast without the transducers having to be set independently of one another.
  • the use of an antivalence circuit exclusive OR circuit is less expensive than that of a previously required flip-flop circuit. In microprocessor-controlled printing systems, it is advantageous if no more time has to be used to determine the polarity of the timing signals when changing direction (forward or reverse).
  • FIG. 1 shows a matrix printer with a print head 10 which moves along a print line on the guide rods 11 and 12, which are fastened between the frame parts 13 and 14.
  • the print head is moved by a cable.
  • a switchable servo motor 15 drives a roller 16, around which the cable 17 is wound, which runs on the opposite end plate via a spring-mounted roller 18.
  • a record carrier, e.g. B. metallized paper 19 is gripped by a pressure roller 20 and a transport roller, not shown, and transported upwards in the direction of the arrow via a paper roller 21.
  • the transport roller is actuated by a stepper motor 22 attached to the side part of the frame 13, which drives the belt 23, which in turn acts on the feed roller 24 to advance the paper line by line.
  • Each phototransistor is assigned to a light source. It provides an output signal that changes with the brightness of the transmitted light, which the sensing element senses during the rotation of the disk.
  • the two pairs of light source / scanning element have the same radial distance from the disk axis; they are arranged on the concentric track of the regions to be scanned at such a distance that they deliver signal sequences which are phase-shifted by 90 °.
  • These signal sequences are processed into timing signals which are transmitted to the print head 10 to excite the printing elements via a flexible cable. If both edges of the pulses in both signal sequences (phase A and B in FIG. 3) are used for time control, the exact mutual adjustment of the scanning elements becomes extremely important in order to ensure a uniform pulse spacing.
  • the printing elements are often arranged in a column that runs perpendicular to the direction of movement of the print head.
  • the pressure elements can optionally be excited to make a corresponding marking.
  • timing pulses are generated for each column position reached by the print head during its travel. Because printhead 10 and timer disk 30 move synchronously, the markings on the timer disk can indicate any column position if the transparent and opaque areas in the disk are sized accordingly.
  • FIG. 2 shows a block diagram for processing the output signal sequences from the scanning elements (converters) 37 and 38 to the time control signals.
  • the output signals from converter 37 are labeled phase A and those from transformer 38 are labeled phase B.
  • the output signals are fed via appropriate amplifiers to an antivalence circuit 41 and a detector circuit 42 for determining the direction of rotation of the timer disk.
  • the output signal sequences of the amplifiers 40 are shown in Figures 3a and 3b for the corresponding phases.
  • the output signal of the antivalence circuit 41 is applied directly to the AND gate 43 and via the inverter 44 to the AND gate 45.
  • the conditioning pulses for each of the AND gates 43 and 45 are the direction signals from the direction detector 42 for forward and backward movement, so that only one of the two AND gates can be activated at a time to pass the direct or the inverted pulses from the antivalence circuit 41 .
  • Forward and backward signals are determined by a logic circuit that detects the sequence of signal level combinations for phases A and B in FIG. 3 and determines the direction in which the print head moves. Such direction detector circuits are generally known.
  • the output signal from the antivalence circuit 41 is shown in Figure 3c, from which it can be seen that a positive pulse occurs on each edge of the phase A signals.
  • the antivalence circuit only delivers a signal if either signals of phases A or B are present alone (exclusive OR function).
  • the active AND gate 43 or 45 supplies an output signal to the OR gate 46.
  • the output signal from the OR gate 46 is supplied as a trigger signal to an adjustable monostable toggle shuttering 47, which in turn sends a control pulse to the various pressure elements.
  • Driver circuits 48 provides.
  • the waveform in FIGS. 3d and 3e shows the pulses for the driver circuit during the forward and backward movement of the print head.
  • the monostable multivibrator 47 can be set to control the duration of the excitation pulse for the individual printing element and thus the strength of the printed mark on the paper.
  • the data to be printed are passed to the buffer memory 51 via a control adapter circuit 50.
  • a control circuit 52 individually directs the characters along with a direction signal to a character generator 53 which then provides the column data to control the appropriate driver for each print element in the printhead.
  • the timing signals for controlling the drivers 48 are generated on each edge of the phase A pulses, and that the timing of the phase B pulses is not critical since it is only for this purpose serve to recognize both edges of the phase A pulses.
  • the transducers on the housing block 33 do not have to be set separately separately; their positions can be maintained within an acceptable tolerance by potting.
  • the resulting timing pulses also have the same polarity and can be either positive or negative; in any case, they maintain the same polarity for each direction. This means that in many cases a microprocessor does not need for every direction to be set differently to recognize the right signals.
  • the converter for phase A should be adjusted to operate at approximately 50% of the duty cycle in order to maintain the timing signals equally spaced.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
EP81107090A 1980-12-30 1981-09-09 Druckersteuerung mit Zeitgeberscheibe Expired EP0055325B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US221223 1980-12-30
US06/221,223 US4343012A (en) 1980-12-30 1980-12-30 Printer control circuit

Publications (2)

Publication Number Publication Date
EP0055325A1 EP0055325A1 (de) 1982-07-07
EP0055325B1 true EP0055325B1 (de) 1984-06-13

Family

ID=22826906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107090A Expired EP0055325B1 (de) 1980-12-30 1981-09-09 Druckersteuerung mit Zeitgeberscheibe

Country Status (4)

Country Link
US (1) US4343012A (enrdf_load_stackoverflow)
EP (1) EP0055325B1 (enrdf_load_stackoverflow)
JP (1) JPS57128579A (enrdf_load_stackoverflow)
DE (1) DE3164188D1 (enrdf_load_stackoverflow)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3125501A1 (de) * 1980-06-30 1982-04-01 Canon K.K., Tokyo Drucker
IT1144294B (it) * 1981-07-10 1986-10-29 Olivetti & Co Spa Dispositivo di stampa getto selettivo d inchiostro
US4397576A (en) * 1981-12-21 1983-08-09 International Business Machines Corporation Print head actuator
US4430657A (en) 1982-03-03 1984-02-07 The Perkin-Elmer Corporation Pen drive for recorder
US4445796A (en) * 1982-06-16 1984-05-01 International Business Machines Corporation Print electrode control circuit
US4533268A (en) * 1982-10-27 1985-08-06 Sanders Jr Roy C Position indicator for high speed printers
DE8333945U1 (de) * 1982-11-29 1984-03-22 Citizen Watch Co., Ltd., Tokyo Punktdrucker
JPS6013551A (ja) * 1983-07-04 1985-01-24 Riso Kagaku Corp サ−マルプリンタ
US4475831A (en) * 1983-08-12 1984-10-09 International Business Machines Corporation Position tracking emitter for a printer with emitter pattern on lead screw
JPS60206665A (ja) * 1984-03-30 1985-10-18 Nec Home Electronics Ltd 往復印字制御方式
US4725949A (en) * 1984-07-06 1988-02-16 Supervision Control Systems, Inc. Intelligent interface for electronic cash register
US5650820A (en) * 1987-03-19 1997-07-22 Canon Kabushiki Kaisha Hand recording apparatus and movement guide therefor
JPS6490761A (en) * 1987-10-01 1989-04-07 Citizen Watch Co Ltd Printer control system
DE3918071A1 (de) * 1989-06-02 1990-12-06 Olympia Aeg Verfahren und schaltungsanordnung zur lagesteuerung eines abtriebsteiles in einer schreib- oder bueromaschine aehnlicher bauart
JP2815968B2 (ja) * 1990-04-16 1998-10-27 キヤノン株式会社 記録装置
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
US6609781B2 (en) 2000-12-13 2003-08-26 Lexmark International, Inc. Printer system with encoder filtering arrangement and method for high frequency error reduction

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195938A (en) * 1977-02-09 1980-04-01 Sycor, Inc. Lateral position control means for data printer heads
US4225251A (en) * 1978-01-09 1980-09-30 The Rank Organisation Limited Electro-mechanical printing apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037230A (en) * 1973-03-12 1977-07-19 Nippon Telegraph And Telephone Public Corporation Timing circuit for ink jet system printer
IT1014154B (it) * 1974-05-10 1977-04-20 Olivetti & Co Spa Dispositivo per lo spostamento di una testina di stampa mediante un motore elettrico a corrente conti nua
JPS5112218A (ja) * 1974-07-19 1976-01-30 Brother Ind Ltd Sadotaikudosochi
US4176977A (en) * 1978-03-08 1979-12-04 Realty & Industrial Corporation Proportional carrier control and moving mechanism for electric typewriter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195938A (en) * 1977-02-09 1980-04-01 Sycor, Inc. Lateral position control means for data printer heads
US4225251A (en) * 1978-01-09 1980-09-30 The Rank Organisation Limited Electro-mechanical printing apparatus

Also Published As

Publication number Publication date
JPS57128579A (en) 1982-08-10
JPH0143637B2 (enrdf_load_stackoverflow) 1989-09-21
DE3164188D1 (en) 1984-07-19
US4343012A (en) 1982-08-03
EP0055325A1 (de) 1982-07-07

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