EP3587131B1 - Druckvorrichtung und verfahren zum positionieren einer druckkopfanordnung in einer druckervorrichtung - Google Patents

Druckvorrichtung und verfahren zum positionieren einer druckkopfanordnung in einer druckervorrichtung Download PDF

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Publication number
EP3587131B1
EP3587131B1 EP18179222.7A EP18179222A EP3587131B1 EP 3587131 B1 EP3587131 B1 EP 3587131B1 EP 18179222 A EP18179222 A EP 18179222A EP 3587131 B1 EP3587131 B1 EP 3587131B1
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EP
European Patent Office
Prior art keywords
print head
head assembly
distance
signal
moving
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EP18179222.7A
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English (en)
French (fr)
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EP3587131A1 (de
Inventor
Matheus J.A.J. PUBBEN
Johan ASMA
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Canon Production Printing Holding BV
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Canon Production Printing Holding BV
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Application filed by Canon Production Printing Holding BV filed Critical Canon Production Printing Holding BV
Priority to EP18179222.7A priority Critical patent/EP3587131B1/de
Publication of EP3587131A1 publication Critical patent/EP3587131A1/de
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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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/316—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with tilting motion mechanisms relative to paper surface
    • 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 present invention relates to a method for positioning a print head assembly in a printer device.
  • the invention also relates to a printer device configured for applying such method.
  • Ink jet printers are known in the art. Ink jet printers apply an image onto a recording medium by applying a predetermined pattern of droplets onto the recording medium.
  • the droplets are generally ejected by one or more print heads.
  • the one or more print heads may be mounted together on a print head assembly.
  • an inkjet printer device may comprise more than one print head assembly.
  • the droplets ejected by an ink jet print head typically have a volume of a few picoliters. These droplets are thus very small. Therefore, it is very important that the droplets are positioned accurately with regard to one another. Therefore, it is necessary that the print head assemblies carrying the print heads are positioned accurately with regard to the printer device.
  • the print head assembly may need to be positioned with regard to the printer device.
  • Methods for positioning a print head assembly with regard to a printer device are known in the art.
  • US 6,249,300 describes a two-step method for positioning a print head assembly in a printer, wherein the first step is a linear homing step and the second step is a rotary homing step.
  • KR 20030088241 describes a driving device for an inkjet printer.
  • the object of the present invention is achieved in a method for positioning a print head assembly in a printer device, the print head assembly comprising:
  • the print head assembly may comprise at least one print head.
  • the print head assembly may comprise a print head array, for example a page wide array for use in a single pass inkjet printer device.
  • the at least one print head may be mounted on a carriage configured to move in reciprocation in a scanning direction.
  • the print head assembly may further comprise means for positioning the print head assembly with regard to the inkjet printer device. These means may comprise a lever, a coarse sensor, a lead screw mechanism and a fine sensor.
  • the lever may be pivotably connected to the inkjet printer device.
  • the print head assembly may be connected to the lever. When moving the lever, the print head assembly is also moved.
  • the lever may be provided with a marker detectable by a sensor. Examples of markers are visible markers or protrusions.
  • the print head assembly may further comprise a coarse sensor.
  • the coarse sensor may be configured to detect proximity of the marker provided on the lever.
  • the coarse sensor may be an inexpensive sensor.
  • the coarse sensor may be a slotted optical switch. When the marker on the lever approaches the coarse sensor, the coarse sensor may generate a signal.
  • the lead screw mechanism may be a mechanism for providing a linear movement of the print head assembly along a lead screw. The movement may be effected by operation of a stepper motor.
  • the lead screw may be provided with a vane configured to rotate around the screw.
  • the vane may be provided with one or more markers for detecting a rotational position of the vane.
  • the marker provided on the vane may be detected by a fine sensor.
  • the marker should be selected such that it can be detected by the fine sensor.
  • the marker may be a protrusion, a magnetic element, or an optical marker.
  • step a) print head assembly is moved to a first position by moving the lever, the first position being the position were the coarse sensor detects the lever.
  • the lever may comprise and/or be operatively connected to suitable moving means.
  • the print head is approximately at the right position.
  • the print head assembly may not be at the exact right position.
  • step b) the print head assembly is moved to a second position by moving the lead screw mechanism in a first direction, the second position being the position were the fine sensor detects a first signal.
  • the lead screw mechanism provides a slower, but more accurate positioning system than the lever and the coarse sensor.
  • the marker provided on the vane provides a regular signal upon rotation, corresponding to a fixed rotational movement of the vane around the lead screw. For example, if the vane comprises one marker, then a signal is detected by the fine sensor one for a full rotation of the vane.
  • the first direction may be opposite the direction of the lever in step a). Alternatively, the first direction and the direction of the lever in step a) may be the same.
  • the lead screw mechanism is moved in the first direction until the fine sensor detects a first signal.
  • step c) print head assembly is moved to a third position by moving the lead screw mechanism in a second direction, the second direction being opposite the first direction until a second signal is detected, the third position being the position were the fine sensor detects a second signal.
  • the first position corresponding to the signal detected by the coarse sensor
  • the second and third position corresponding to the first and second signal, respectively, detected by the fine sensor. It is now known in between which positions, corresponding to the fine sensor signals, the desired position is. Because of the inaccuracy of the coarse sensor, the print head assembly cannot yet be placed in the desired position. To obtain the desired position, the following steps are taken.
  • determining the first distance Based on the detected first, second and third position, determining the first distance, the first distance being the distance between the first and second signal and determining the second distance, the second distance being the distance between the first and third signal.
  • step d) the first distance, the first distance being the distance between the first and second signal and the second distance, the second distance being the distance between the first and third signal are determined based on the detected first, second and third position.
  • step e) a first difference between the first distance and a predetermined distance is determined, as well as a second difference between the second distance and the predetermined distance.
  • the predetermined distance may be determined in a calibration procedure.
  • the predetermined may be stored on suitable storing means.
  • the predetermined distance may be the distance between a previously measured position corresponding to a signal of the coarse sensor and the closest position, corresponding to a signal detected by the fine sensor.
  • step f it is determined which of the first difference and second difference is smallest. Now it is known which of these distances closes resembles the predetermined distance.
  • step g) a reference signal is selected from the group consisting of the first and second signal. The reference signal is the fine sensor signal corresponding to the distance closest resembling the predetermined distance.
  • step h) the print head assembly is moved to a final position, the final position being in between the second and third position, the final position being positioned at the predetermined distance from the reference signal.
  • the final position is the desired position of the print head assembly.
  • the final position is the position where the print head assembly is properly positioned with regard to the printer frame and the paper path.
  • the accuracy of positioning a print head assembly can be improved. Accurate positioning is important to obtain good print quality.
  • the method further comprises the steps of: a' storing the position were the coarse sensor detects the lever.
  • the signal of the coarse sensor may show drift.
  • the detected coarse signal it can be compared to other signals of the coarse sensor (previously measured signals as well as signals to be measured in future).
  • By storing the measured signal and comparing it to previously measured signals of the coarse sensor it can be determined whether drift has occurred. This drift can then be compensated for when determining the reference signal.
  • the maximum drift of the sensor is less than half the distance between two subsequent signals of the fine sensor. If the drift approaches the maximum drift, then a warning may be issued, based on which the user may take measures, such as cleaning the sensors. Alternatively, cleaning of the sensors may be done in an automated way.
  • a printer apparatus comprising a print head assembly in a printer device, the print head assembly comprising:
  • the printer apparatus is thus configured to perform the method according to the present invention.
  • the printer apparatus is an inkjet printer apparatus
  • FIG. 1 and Fig. 2A -C show schematic representations of an inkjet printing system and an inkjet marking device, respectively.
  • Fig. 1 shows a sheet of a receiving medium P.
  • the image receiving medium P may be composed of e.g. paper, cardboard, label stock, coated paper, plastic, machine coated paper or textile. Alternatively, the receiving medium may be a medium in web form (not shown).
  • the medium, P is transported in a direction for conveyance as indicated by arrows 50 and 51 and with the aid of transportation mechanism 12.
  • Transportation mechanism 12 may be a driven belt system comprising one (as shown in Fig. 1 ) or more belts. Alternatively, one or more of these belts may be exchanged for one or more drums.
  • a transportation mechanism may be suitably configured depending on the requirements (e.g.
  • the printing process as described below comprises of the following steps: media pre-treatment, image formation, drying and fixing and optionally post treatment.
  • Fig. 1 shows that the sheet of receiving medium P may be conveyed to and passed through a first pre-treatment module 13, which module may comprise a preheater, for example a radiation heater, a corona/plasma treatment unit, a gaseous acid treatment unit or a combination of any of the above.
  • a predetermined quantity of the pre-treatment liquid is applied on the surface of the receiving medium P at pre-treatment liquid applying member 14.
  • the pre-treatment liquid is provided from storage tank 15 of the pre-treatment liquid to the pre-treatment liquid applying member 14 composed of double rolls 16 and 17. Each surface of the double rolls may be covered with a porous resin material such as sponge.
  • the pre-treatment liquid is transferred to main roll 17, and a predetermined quantity is applied on the surface of the receiving medium P.
  • the image receiving medium P on which the pre-treatment liquid was supplied may optionally be heated and dried by drying member 18 which is composed of a drying heater installed at the downstream position of the pre-treatment liquid applying member 14 in order to decrease the quantity of the water content in the pre-treatment liquid to a predetermined range. It is preferable to decrease the water content in an amount of 1.0 weight% to 30 weight% based on the total water content in the provided pre-treatment liquid provided on the receiving medium P.
  • a cleaning unit (not shown) may be installed and/or the transportation mechanism may be comprised of multiple belts or drums as described above. The latter measure prevents contamination of the upstream parts of the transportation mechanism, in particular of the transportation mechanism in the printing region.
  • Image formation is performed in such a manner that, employing an inkjet printer loaded with inkjet inks, ink droplets are ejected from the inkjet heads based on the digital signals onto a print medium.
  • the inkjet inks may be ink jet inks according to the present invention.
  • single pass inkjet printing is preferably used since it is effective to perform high-speed printing.
  • Single pass inkjet printing is an inkjet recording method with which ink droplets are deposited onto the receiving medium to form all pixels of the image by a single passage of a receiving medium underneath an inkjet marking module.
  • an inkjet marking module comprising four inkjet marking devices, indicated with 111, 112, 113 and 114, each arranged to eject an ink of a different color (e.g. Cyan, Magenta, Yellow and blacK).
  • the nozzle pitch of each head is e.g. about 360 dpi.
  • "dpi" indicates a dot number per 2.54 cm.
  • An inkjet marking device for use in single pass inkjet printing, 111, 112, 113, 114 has a length, L, of at least the width of the desired printing range, indicated with double arrow 52, the printing range being perpendicular to the media transport direction, indicated with arrows 50 and 51.
  • the inkjet marking device may comprise a single print head having a length of at least the width of said desired printing range.
  • the inkjet marking device may also be constructed by combining two or more inkjet heads, such that the combined lengths of the individual inkjet heads cover the entire width of the printing range.
  • Such a constructed inkjet marking device is also termed a page wide array (PWA) of print heads.
  • PWA page wide array
  • FIG. 2A shows an inkjet marking device111 (112, 113, 114 may be identical) comprising 7 individual inkjet heads (201, 202, 203, 204, 205, 206, 207) which are arranged in two parallel rows, a first row comprising four inkjet heads (201 - 204) and a second row comprising three inkjet heads (205 - 207) which are arranged in a staggered configuration with respect to the inkjet heads of the first row.
  • the staggered arrangement provides a page wide array of nozzles which are substantially equidistant in the length direction of the inkjet marking device.
  • the staggered configuration may also provide a redundancy of nozzles in the area where the inkjet heads of the first row and the second row overlap, see 70 in Fig. 2B .
  • Staggering may further be used to decrease the nozzle pitch (hence increasing the print resolution) in the length direction of the inkjet marking device, e.g. by arranging the second row of inkjet heads such that the positions of the nozzles of the inkjet heads of the second row are shifted in the length direction of the inkjet marking device by half the nozzle pitch, the nozzle pitch being the distance between adjacent nozzles in an inkjet head, d nozzle (see Fig. 2C , which represents a detailed view of 80 in Fig. 2B ).
  • the resolution may be further increased by using more rows of inkjet heads, each of which are arranged such that the positions of the nozzles of each row are shifted in the length direction with respect to the positions of the nozzles of all other rows.
  • an inkjet head i.e. print head
  • an inkjet head i.e. print head
  • an ink ejection system there may be usable either the electric-mechanical conversion system (e.g., a single-cavity type, a double-cavity type, a bender type, a piston type, a shear mode type, or a shared wall type), or an electric-thermal conversion system (e.g., a thermal inkjet type, or a Bubble Jet type (registered trade name)).
  • the electric-mechanical conversion system e.g., a single-cavity type, a double-cavity type, a bender type, a piston type, a shear mode type, or a shared wall type
  • an electric-thermal conversion system e.g., a thermal inkjet type, or a Bubble Jet type (registered trade name)
  • a piezo type inkjet recording head which has nozzles of a diameter of 30 ⁇ m or less in the current image forming method.
  • Fig. 1 shows that after pre-treatment, the receiving medium P is conveyed to upstream part of the inkjet marking module 11. Then, image formation is carried out by each color ink ejecting from each inkjet marking device 111, 112, 113 and 114 arranged so that the whole width of the image receiving medium P is covered.
  • the image formation may be carried out while the receiving medium is temperature controlled.
  • a temperature control device 19 may be arranged to control the temperature of the surface of the transportation mechanism (e.g. belt or drum) underneath the inkjet marking module 11.
  • the temperature control device 19 may be used to control the surface temperature of the receiving medium P, for example in the range of 10°C to 100°C.
  • the temperature control device 19 may comprise heaters, such as radiation heaters, and a cooling means, for example a cold blast, in order to control the surface temperature of the receiving medium within said range. Subsequently and while printing, the receiving medium P is conveyed to the downstream part of the inkjet marking module 11.
  • the prints After an image has been formed on the receiving medium, the prints have to be dried and the image has to be fixed onto the receiving medium. Drying comprises the evaporation of solvents, in particular those solvents that have poor absorption characteristics with respect to the selected receiving medium.
  • Fig. 1 schematically shows a drying and fixing unit 20, which may comprise a heater, for example a radiation heater.
  • the print is conveyed to and passed through the drying and fixing unit 20.
  • the print is heated such that solvents present in the printed image, such as water and/or organic co-solvents, evaporate.
  • the speed of evaporation and hence drying may be enhanced by increasing the air refresh rate in the drying and fixing unit 20.
  • film formation of the ink occurs, because the prints are heated to a temperature above the minimum film formation temperature (MFFT).
  • MFFT minimum film formation temperature
  • the residence time of the print in the drying and fixing unit 20 and the temperature at which the drying and fixing unit 20 operates are optimized, such that when the print leaves the drying and fixing unit 20 a dry and robust print has been obtained.
  • the transportation mechanism 12 in the fixing and drying unit 20 may be separated from the transportation mechanism of the pre-treatment and printing section of the printing apparatus and may comprise a belt or a drum.
  • the print may be post treated, which is an optional step in the printing process.
  • the prints may be post treated by laminating the prints.
  • the post-treatment step comprises a step of applying (e.g. by jetting) a post-treatment liquid onto the surface of the coating layer, onto which the inkjet ink has been applied, so as to form a transparent protective layer on the printed recording medium.
  • the printing process was described such that the image formation step was performed in-line with the pre-treatment step (e.g. application of an (aqueous) pre-treatment liquid) and a drying and fixing step, all performed by the same apparatus (see Fig. 1 ).
  • the printing process is not restricted to the above-mentioned embodiment.
  • a method in which two or more machines are connected through a belt conveyor, drum conveyor or a roller, and the step of applying a pre-treatment liquid, the (optional) step of drying a coating solution, the step of ejecting an inkjet ink to form an image and the step or drying an fixing the printed image are performed. It is, however, preferable to carry out image formation with the above defined in-line image forming method.
  • Fig. 3A shows the first position 401, corresponding to the position were the coarse sensor detected the lever.
  • the (first) position may also be referred to as (first) signal.
  • Fig. 3B shows the position of the second position 402.
  • Fig. 3C shows the position of the third position 403, as well as the second position 402.
  • the signals are provided at regular intervals; the distance between two subsequent signals of the fine sensors is constant.
  • Positions in between the second position 402 and the third position 403 may be expressed e.g. in a number of steps performed by a stepper motor.
  • positions in between the second position 402 and the third position 403 may be expressed e.g. in degrees rotation of the vane.
  • Fig. 3D shows first distance 411, the first distance being the distance between the first signal 401 and the second signal 402.
  • Fig. 3D further shows second distance 412, the second distance being the distance between the first signal 401 and the third signal 403.
  • the first distance is 1120 steps, whereas the second distance is - 480 steps.
  • the sign corresponds to the relative position of the second position, third position, respectively with regard to to the first position.
  • Fig. 3E shows a predetermined distance 413, based on a predetermined position 404. In the example shown, the predetermined distance is + 400.
  • the difference between the first distance 411 and the predetermined distance 413 is 720 (1120 - 400), the difference between the second distance 412 and the predetermined distance 413 is 880(400- -480).
  • the difference between the first distance and the predetermined distance is smaller than the difference between the second distance and the predetermined distance.
  • the second position 402, corresponding to the first signal provided by the fine sensor is used as reference position.
  • Fig. 4 shows a first example of a mechanism 300 for positioning a print head assembly.
  • the mechanism 300 comprises lever 304 pivotably positioned around pivot 305.
  • the lever 304 is operatively connected to coarse sensor 301.
  • the lever can be further moved by lead screw arrangement 308.
  • the lead screw arrangement 308 comprises vane 303, which is operatively connected to induce a signal in fine sensor 302.
  • Part 307 is part of the print frame.
  • a print head (not shown) is operatively connected to the part 307.
  • the positioning part 306 can be placed against the media belt of the printer.
  • Fig. 5A shows a second example of a mechanism 300 for positioning a print head assembly.
  • Fig. 5B shows , the same example, but viewed at from a different perspective.
  • the vane is embodied as a rotatable protrusion 303.
  • the rotatable protrusion 303 may be magnetic.
  • the fine sensor 302 may provide a signal when the sensor 302 detects the rotatable protrusion 303.

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  • Ink Jet (AREA)

Claims (4)

  1. Verfahren zum Positionieren einer Druckkopfanordnung in einer Druckvorrichtung, wobei die Druckkopfanordnung aufweist:
    - einen Hebel (304) zum Bewegen der Druckkopfanordnung in der Druckvorrichtung;
    - einen groben Sensor (301), der dazu konfiguriert ist, eine Position der Druckkopfanordnung zu detektieren;
    - einen Spindelmechanismus (308) zum Bewegen der Druckkopfanordnung entlang des Spindelpfades;
    - einen feinen Sensor (302), der dazu konfiguriert ist, eine Drehposition des Spindelmechanismus (308) zu detektieren,
    wobei das Verfahren durch die folgenden Schritte gekennzeichnet ist:
    a) bewegen der Druckkopfanordnung zu einer ersten Position durch Bewegen des Hebels (304), wobei die erste Position diejenige Position ist, an der der grobe Sensor (301) den Hebel (304) detektiert;
    b) bewegen der Druckkopfanordnung zu einer zweiten Position durch Bewegen des Spindelmechanismus (308) in einer ersten Richtung, wobei die zweite Position diejenige Position ist, an der der feine Sensor (302) ein erstes Signal detektiert;
    c) bewegen der Druckkopfanordnung zu einer dritten Position durch Bewegen des Spindelmechanismus (308) in einer zweiten Richtung, wobei die zweite Richtung der ersten Richtung entgegengesetzt ist, bis ein zweites Signal detektiert wird, wobei die dritte Position diejenige Position ist, an der der feine Sensor (302) ein zweites Signal detektiert;
    d) auf der Basis der detektierten ersten, zweiten und dritten Positionen, bestimmen des ersten Abstands (411), wobei der erste Abstand der Abstand zwischen dem ersten und dem zweiten Signal ist, und bestimmen des zweiten Abstands (412), wobei der zweite Abstand der Abstand zwischen dem ersten und dem dritten Signal ist;
    e) bestimmen einer ersten Differenz zwischen dem ersten Abstand (411) und einem vorbestimmten Abstand (413), und bestimmen einer zweiten Differenz zwischen dem zweiten Abstand (412) und dem vorbestimmten Abstand (413),
    f) bestimmen, welche Differenz unter der ersten Differenz und der zweiten Differenz die kleinste ist;
    g) auswählen eines Referenzsignals aus der Gruppe, die besteht aus dem ersten und dem zweiten Signal;
    h) bewegen der Druckkopfanordnung in eine endgültige Position, wobei die endgültige Position zwischen der zweiten und der dritten Position liegt, wobei die endgültige Position an dem vorbestimmten Abstand (413) zu dem Referenzsignal positioniert ist.
  2. Verfahren nach Anspruch 1, bei dem das Verfahren weiterhin den folgenden Schritt aufweist:
    a') speichern der Position, an der der grobe Sensor (301) den Hebel (304) detektiert.
  3. Druckgerät, das eine Druckkopfanordnung in einer Druckvorrichtung aufweist, wobei die Druckkopfanordnung aufweist:
    - einen Hebel (304) zum Bewegen der Druckkopfanordnung in der Druckvorrichtung;
    - einen groben Sensor (301), der dazu konfiguriert ist, eine Position der Druckkopfanordnung zu detektieren;
    - einen Spindelmechanismus (308) zum Bewegen der Druckkopfanordnung entlang des Spindelpfades;
    - einen feinen Sensor (302), der dazu konfiguriert ist, eine Drehposition des Spindelmechanismus (308) zu detektieren,
    dadurch gekennzeichnet, dass das Druckgerät weiterhin eine Steuereinheit aufweist, die dazu konfiguriert ist, das Druckgerät dazu anzusteuern, das Verfahren nach einem der Ansprüche 1 bis 2 auszuführen.
  4. Druckgerät nach Anspruch 3, bei dem die Druckvorrichtung eine Tintenstrahldruckvorrichtung ist.
EP18179222.7A 2018-06-22 2018-06-22 Druckvorrichtung und verfahren zum positionieren einer druckkopfanordnung in einer druckervorrichtung Active EP3587131B1 (de)

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EP18179222.7A EP3587131B1 (de) 2018-06-22 2018-06-22 Druckvorrichtung und verfahren zum positionieren einer druckkopfanordnung in einer druckervorrichtung

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Application Number Priority Date Filing Date Title
EP18179222.7A EP3587131B1 (de) 2018-06-22 2018-06-22 Druckvorrichtung und verfahren zum positionieren einer druckkopfanordnung in einer druckervorrichtung

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EP3587131A1 EP3587131A1 (de) 2020-01-01
EP3587131B1 true EP3587131B1 (de) 2021-06-09

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68918898T2 (de) * 1988-07-21 1995-03-16 Canon Kk Serienaufzeichnungsgerät.
US6249300B1 (en) 1999-07-15 2001-06-19 Eastman Kodak Company Method and apparatus for positioning a writing assembly of an image processing apparatus
KR100419226B1 (ko) * 2002-05-13 2004-02-21 삼성전자주식회사 잉크젯 프린터의 구동장치
JP2005212147A (ja) * 2004-01-27 2005-08-11 Konica Minolta Holdings Inc インクジェットプリンタ
JP4668044B2 (ja) * 2005-11-24 2011-04-13 株式会社リコー インクジェット記録装置

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