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EP1676706B1 - Drucker mit abnehmbarem Druckkopf - Google Patents

Drucker mit abnehmbarem Druckkopf Download PDF

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Publication number
EP1676706B1
EP1676706B1 EP20050112666 EP05112666A EP1676706B1 EP 1676706 B1 EP1676706 B1 EP 1676706B1 EP 20050112666 EP20050112666 EP 20050112666 EP 05112666 A EP05112666 A EP 05112666A EP 1676706 B1 EP1676706 B1 EP 1676706B1
Authority
EP
European Patent Office
Prior art keywords
printhead
wire
support plate
printheads
printer according
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.)
Ceased
Application number
EP20050112666
Other languages
English (en)
French (fr)
Other versions
EP1676706A1 (de
Inventor
Wilhelmus H.J. Nellen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Netherlands BV
Original Assignee
Oce Technologies BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oce Technologies BV filed Critical Oce Technologies BV
Priority to EP20050112666 priority Critical patent/EP1676706B1/de
Publication of EP1676706A1 publication Critical patent/EP1676706A1/de
Application granted granted Critical
Publication of EP1676706B1 publication Critical patent/EP1676706B1/de
Anticipated expiration legal-status Critical
Ceased 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/1752—Mounting within the printer

Definitions

  • the invention relates to a printer having a printhead that is detachably mounted on a support plate and is held thereon at two rigid support points located on a first side of the printhead, and one elastic support point located on a second side of te printhead opposite to said first side, wherein each of the support points is formed by a first part on the side of the printhead and a second part on the side of the support plate, and one of the first and second parts is a spherical surface engaged in a recess of the other of the first and second parts in a self-centered manner.
  • the invention is applicable to a scanning-type printer, e. g. an ink jet printer, wherein the support plate is provided on a carriage so that it may scan a recording medium in a main scanning direction, while the printhead faces the recording medium and prints individual pixels or sets of pixels.
  • a scanning-type printer e. g. an ink jet printer
  • the support plate is provided on a carriage so that it may scan a recording medium in a main scanning direction, while the printhead faces the recording medium and prints individual pixels or sets of pixels.
  • the printhead is stably positioned on the support plate with very high accuracy in all six degrees of freedom of the printhead.
  • the accuracy requirements increase with increasing resolution of the printer and may for example allow only tolerances up to ⁇ 3 mm.
  • the printhead typically has a plurality of nozzles that are arranged in a linear array forming an angle of exactly or approximately 90° with the main scanning direction. Then, the angle between the nozzle array and the main scanning direction must be defined with high precision.
  • the printer has a plurality of printheads mounted on the same support plate, e. g. printheads for different colors in case of a color printer. Then, the angular positions of the nozzle arrays must be exactly the same for all printheads.
  • the printheads must be arranged with well defined spacings in the main scanning direction and must also be exactly aligned in that direction.
  • the ink droplets expelled from the nozzles have two fly a certain distance through the air, until they hit the recording medium. Since the carriage is moving, the flight distance of the ink droplets has an influence on the positions of the pixels formed on the recording medium, and, as a consequence, the gap between the printheads and the recording medium must also be defined with high accuracy.
  • the position and posture of the printhead in all six degrees of freedom is defined by six contact surfaces at which the printhead engages the support plate, and a spring assembly is used for biasing the printhead against each contact surface.
  • a spring assembly is used for biasing the printhead against each contact surface.
  • EP-A-0 791 461 discloses an ink jet printer of th type indicated in the preamble of claim 1, wherein four support points are formed by two pairs of recesses on opposite sides of the printhead, and two spherical surfaces formed directly on the mounting plate so as to engage in the recesses of the first pair, and two spherical surfaces formed on a detachable clamping plate so as to engage in the recesses of the second pair.
  • the clamping plate can be biased against the mounting plate and is positioned relative thereto by another sphere-and-recess-type support point.
  • this object is achieved by a printer as defined in claim 1.
  • This releasable support point is formed by a recess in the body of the printhead and a spherical surface in the form of a bead that is fixed on a piece of wire. Since this support point will be located on the side of the printhead that is remote from the support surface, the necessary biasing force can simply be provided by means of tension springs which draw the wire towards the support plate.
  • the elastic force is transmitted through the body of the printhead and causes also the spherical surfaces at the two rigid support points to center themselves in their respective recesses.
  • one simple operation is sufficient for adjusting the printhead exactly in the desired position and posture and fixing it in all six degrees of freedom.
  • the frictional forces involved in the self-centering operations are extremely small, the exact positioning of the printhead is highly reproducible and reliable.
  • the mounting structure for the printhead should allow for a certain thermal expansion and contraction of the printhead. This can be achieved by arranging the two rigid support points on one of the longer sides of the printhead in the vicinity of the ends thereof and by using a conical shape of the recess only for one support point but an elongated recess, for example in the form of a V-shaped groove, for the other support point.
  • the spherical surface engaging in the conical recess will fix the position of the printhead in all three translational degrees of freedom, and the engagement of the other spherical surface in the V-shaped groove will fix two rotational degrees of freedom but will allow this spherical surface to slide in the groove in order to compensate for thermal expansion.
  • the elastic support point which, in the above construction, only has to fix the printhead in the remaining third rotational degree of freedom, may also comprise a groove-shaped recess.
  • the angular position of the printhead (third rotational degree of freedom) can easily and precisely be controlled by adjusting the longitudinal position of a wire, since any possible bending of the wire will have no influence on the angular position of the printhead.
  • This construction is particularly useful for a printer in which a plurality of printheads are arranged side-by-side on the support plate.
  • the elastic support point for all the printheads may be formed by a single wire on which the beads are arranged with well defined spacings. The angular position of all the printheads may thus be adjusted by simply adjusting the longitudinal position of the single wire. Likewise, the elastic support points for all the printheads may easily be released simply be lifting and removing the wire.
  • the elastic support points and the wire are located in a central position of the printheads, so that both rigid support points of each printhead would be subject to essentially equal biasing forces.
  • the elastic support points and the wire are located near an end portion of the printheads, so that it is sufficient to move the wire only a little distance aside in order to be able to remove the printheads.
  • an additional spring mechanism may be used for exerting a biasing force on the other ends of the printheads and on the corresponding rigid support points. It should be observed however that this additional spring mechanism is not involved in positioning the printheads but only serves to make the engagement at the rigid support points more reliable.
  • the additional spring mechanism may be lifted and shifted aside similarly as the wire described above.
  • the lift and shift movements of the wire and the additional spring mechanism are mechanically coupled to one another, so that the replacement operation becomes particularly simple.
  • the spherical surfaces for all support points are preferably formed by metal balls which have a sufficient hardness and are readily available with exactly defined diameters and exact spherical surfaces, so that a high positioning accuracy may be achieved.
  • a hot melt ink jet printhead is mounted in an upright position on a metal support plate 12.
  • the support plate 12 is attached to a carriage (not shown) of the printer, which reciprocates in the direction normal to the drawing in Fig. 1 , so that the printhead 10 scans a recording medium that would be disposed right underneath the support plate.
  • a lower portion of the printhead 10 is inserted with play in a recess 14 formed in the top surface of the support plate 12 and has a nozzle section 16 which projects through an opening of the support plate and forms a downwardly oriented nozzle face 18.
  • the support plate 12 is rigidly held by the carriage and is so adjusted that it is exactly parallel to the surface of the recording medium.
  • the printhead 10 has to be positioned on the support plate 12 with high accuracy, so that its position in all three directions in space is well defined and known, the nozzle face 18 is also exactly parallel with the surface of the recording medium, and the lengthwise direction of the printhead (from left to right in Fig. 1 ) forms exactly a right angle with the direction of movement of the carriage. This is achieved by holding and positioning the printhead 10 on the support plate 12 at three support points 20, 22 and 24.
  • the two support points 20 and 22 rigidly support the printhead 10 on the bottom of the recess 14 and are located at opposite ends of the printhead. Each of them comprises a spherical surface that is formed by a metal ball 26 and engages in a recess 28, 30 of the support plate 12.
  • the balls 26 are partly embedded in the body of the printhead 10 which may for example be made of carbon, and the extent to which the balls project from the printhead has been adjusted with high accuracy.
  • the recess 28 has the shape of an upwardly open cone that has precisely been machined in the support plate 14. Thus, when the ball 26 is slightly pressed into the recess 28, it will automatically be centered on the center of the recess and will then be fixed in all three directions in space.
  • the recess 30 of the support point 22 is a V-shaped groove which extends in longitudinal direction of the printhead.
  • the cross-sections of the recesses 28 and 30 in the plane normal to the lengthwise direction of the printhead are visible in Figs. 2 and 3 , respectively.
  • the support point 22 prevents the printhead 10 from rotating about a vertical axis passing through the support point 20, and also from rotating about an axis passing through the support point 20 and being normal to the plane of the drawing in Fig. 1 .
  • the support point 22 permits however a slight thermal expansion or contraction of the printhead in its lengthwise direction.
  • the third support point 24 is located on the top side of the printhead 10 approximately above the support point 20 and is formed by a ball 32 engaging in a recess 34.
  • the ball 32 is fixed on a wire 36 which is shown in cross-section in Fig. 1 .
  • the recess 34 is a V-shaped groove which extends in longitudinal direction of the printhead and passes over a roof-shaped structure on the top side of the printhead.
  • the support point 24 prevents the printhead 10 from tilting about an axis that is defined by the two rigid support points 20 and 22.
  • the top portion of the printhead 10 forms a ledge 38 at the end opposite to that of the recess 34, and a wire 40, shown in cross-section, rests on this ledge.
  • the wires 36 and 40 are spring-biased downwardly, so that the ball 32 is forced into the recess 34 and is centered therein, and the balls 26 are forced into the recesses 28 and 30.
  • the wire 40 does in no way define the position of the printhead and only serves to supplement the biasing force of the wire 36 and to prevent the ball of the support point 22 from upwardly escaping out of the recess 30.
  • Fig. 4 is a perspective view of the printhead 10 and shows a linear array of nozzles 42 in the nozzle face 18.
  • Fig. 5 two printheads 10 are shown in their position on the support plate 12, which has recesses 14 for six further printheads.
  • the support plate 12 has lugs 44 for attachment at the carriage.
  • the wire 36 extends over all the mounting positions for the printheads 10 and carries a ball 32 for each printhead.
  • the spacings between the balls 32 correspond exactly to the spacing between the printheads 10.
  • a number of tension springs 46 are anchored at the wire 36 in the intervals between the balls 32 and bias the wire 36 towards the support plate 12. Thanks to the distribution of the tension springs 46, the biasing force is evenly distributed over the length of the wire 36.
  • the tension springs are anchored at the support plate 12 at positions laterally offset from the vertical projection of the wire 36, so that the springs are slightly inclined and urge the wire 36 and the balls 32 against the slopes of the roof structures of the printheads 10. These roof structures prevent the wire from slipping off from the printheads.
  • the wire 40 at the other end of the printheads forms a number of regularly spaced loops in which tension springs 48 are anchored which bias the wire 40 towards the support plate 12.
  • the whole assembly of printheads 10 is accommodated in a case-like frame 50 which is mounted on the support plate 12 and has end walls 52 supporting the opposite ends of the wires 36 and 40.
  • the position of the wires in their longitudinal direction is precisely defined.
  • Outwardly projecting top portions of the end walls 52 serve for rotatably supporting two shafts 54, 56 which each carry a set of hooks 58, 60.
  • the hooks 58, 60 which are located in the gaps between the adjacent printheads 10, are positioned slightly below the wires 36, 40 without contacting them. Thus, the hooks are inoperative in this position.
  • the hooks 58, 60 may be pivoted into the positions shown in phantom lines, thereby lifting the wires 36, 40 and moving them outwardly, so that the printheads 10 can be withdrawn out of the recesses of the support plate 12.
  • Fig. 8 the inoperative position of the hooks 58, 60 is shown in phantom lines, and continuous lines show the lifted position of the hooks and the wires.
  • the opposite ends of the shaft 56 each carry a lever 62 having a handle 64 which may be gripped for pivoting the lever and hence the hooks 60.
  • the levers 62 are arranged adjacent to and in parallel with the end walls 52 of the frame 50.
  • the shaft 54 carries two arcuate levers 66 for pivoting the hooks 58.
  • the levers 66 have an arcuate slot 68 with an upwardly angled end portion 70.
  • a pin 72 projects from the lever 62 and into the slot 68.
  • the handle 64 When the user wants to detach one or more printheads, he grips the handle 64 and tilts the lever 62 into the position shown in continuous lines in Fig. 8 .
  • the pin 72 will push the lever 66 upwardly, thereby tilting the hooks 58, and, finally, the pin 72 will be captioned in the angled portion 70 of the slot, so that the assembly is arrested in an open position permitting to remove the printheads.
  • the handle 64 is a bow which connects the two levers 62 and is so arranged that it permits easy access to the printheads. It will be understood that the tension springs 46 and 48 ( Fig. 6 ) are expanded when the hooks are lifted, and hold the wires 36 and 40 in engagement in the hooks.
  • the levers 66 are manually drawn upwardly so that the pin 72 will enter into the arcuate slot 68.
  • the levers 66 are provided with outwardly projecting tabs 74.
  • the pin 72 being at the right end of the arcuate portion of the slot 68, the levers 62 may be tilted back into the position shown in phantom lines, and the levers 66 will be gently be returned into their lowered position while the pin 72 moves to the right end of the slot 68.
  • the wires 36, 40 will again be placed on top of the printheads and on the ledges 38, respectively, and the biasing forces of the springs will act upon the balls 32 and on the printheads, so that the balls 32, 26 are centered in their positions in the recesses 34, 28 and 30.
  • the design of the levers 62, 66 and the dimensions of the springs 46, 48 are such that, at first, the springs 46 will bias the wire 36, so that the printheads will be positioned by the action of the three support points without being subject to any substantial frictional forces. Only then will the wire 40 engage the ledge 38 to secure the printheads in their position.

Landscapes

  • Common Mechanisms (AREA)

Claims (18)

  1. Drucker mit einem Druckkopf (10), der lösbar an einer Tragplatte (12) montiert und daran an zwei starren Unterstützungspunkten (20, 22), die sich auf einer ersten Seite des Druckkopfes befinden, und einem elastischen Unterstützungspunkt (24), der sich auf einer zweiten Seite des Druckkopfes gegenüberliegend zu der ersten Seite befindet, gehalten ist, wobei jeder der Unterstützungspunkte (20, 22, 24) durch ein erstes Element auf der Seite des Druckkopfes und ein zweites Element auf der Seite der Tragplatte gebildet wird und eines der ersten und zweiten Elemente eine sphärische Oberfläche (26, 32) ist, die in selbstzentrierender Weise in eine Ausnehmung (28, 30, 34) des anderen der ersten und zweiten Elemente eingreift, dadurch gekennzeichent, daß das zweite Element des elastischen Unterstützungspunktes (24) eines sphärische Oberfläche hat und durch eine Perle oder Kugel (32) gebildet ist, die auf einem Draht (36) fixiert ist, und der Draht (36) elastisch in Richtung auf die Ausnehmung (34) vorgespannt ist, so daß der elastische Unterstützungspunkt (24) den Druckkopf (10) in Richtung auf die genannte erste Seite des Druckkopfes vorspannt und durch Anheben des Drahtes gelöst werden kann, um den Druckkopf abzunehmen.
  2. Drucker nach Anspruch 1, bei dem der Druckkopf (10) in allen sechs Freiheitsgraden durch genau drei Unterstützungspunkte (20, 22, 24) festgelegt ist.
  3. Drucker nach Anspruch 1 oder 2, bei dem ein erster der starren Unterstützungspunkte (20) eine konische Ausnehmung (28) aufweist, die die Position der entsprechenden sphärischen Oberfläche (26) in allen drei Raumrichtungen definiert.
  4. Drucker nach Anspruch 3, bei dem der andere starre Unterstützungspunkt (22) eine V-förmige Nut (30) aufweist, die die Position der entsprechenden sphärischen Oberfläche (26) in zwei Raumrichtungen definiert und deren longitudinale Achse radial in Bezug auf den ersten Unterstützungspunkt (20) angeordnet ist.
  5. Drucker nach einem der vorstehenden Ansprüche, bei dem der Druckkopf (10) einen länglichen Körper hat und die beiden starren Unterstützungspunkte (20, 22) an entgegengesetzten Enden dieses Körpers angeordnet sind.
  6. Drucker nach einem der vorstehenden Ansprüche, bei dem die sphärischen Oberflächen (26) der starren Unterstützungspunkte (20, 22) an dem Druckkopf (10) und die entsprechenden Ausnehmungen (28, 30) in der Tragplatte gebildet sind.
  7. Drucker nach einem der vorstehenden Ansprüche, bei dem der elastische Unterstützungspunkt (24) eine Ausnehmung in der Form einer V-förmigen Nut hat, die, durch Eingriff der sphärischen Oberfläche (32), den Druckkopf (10) gegen eine Schwenkbewegung um eine Achse sichert, die durch die beiden starren Unterstützungspunkte (20, 22) definiert ist.
  8. Drucker nach Anspruch 7, bei dem der Draht (36) in einer Richtung rechtwinklig zu der durch die beiden starren Unterstützungspunkte (20, 22) definierten Schwenkachse verläuft.
  9. Drucker nach einem der vorstehenden Ansprüche, bei dem eine Vielzahl von Druckköpfen (10) auf derselben Tragplatte (12) montiert sind und die elastischen Unterstützungspunkte (24) der mehreren Druckköpfe durch Perlen oder Kugeln gebildet sind, die an einem gemeinsamen Draht (36) befestigt sind.
  10. Drucker nach einem der vorstehenden Ansprüche, bei dem der Druckkoopf oder die Druckköpfe einen langgestreckten Körper haben und die elastischen Unterstützungspunkte (24) in der Nähe eines Endes des Körpers angeodnet sind.
  11. Drucker nach einem der vorstehenden Ansprüche, bei dem Zugfedern (46) mit einem Ende an der Tragplatte (12) und mit dem anderen Ende an dem Draht (36) verankert sind, damit der Draht in Richtung auf die Tragplatte vorgespannt wird.
  12. Drucker nach Anspruch 11, mit einem Hubmechanismus (58) zum Abheben des Drahtes (36) von der Tragplatte (12) entgegen der Kraft der Zugfedern (46) und zum Bewegen des Drahtes nach außen in eine Position, in der er das Abnehmen der Druckköpfe (10) von der Tragplatte erlaubt.
  13. Drucker nach Anspruch 11 oder 12, mit einem Federmechanismus (40, 48), der dazu ausgebildet ist, die Enden der Druckköpfe (10), die den mit den elastischen Unterstützungspunkten (24) versehenen Enden entgegengesetzt sind, gegen die Tragplatte (12) vorzuspannen.
  14. Drucker nach Anspruch 13, bei dem der Federmechanismus einen auf den Druckköpfen (40) aufliegenden Draht (40) und Zugfedern (48) aufweist, die den Draht (40) mit der Tragplatte (12) verbinden.
  15. Drucker nach Anspruch 14, bei dem der Federmechanismus einen Hubmechanismus (60) zum Abheben des Drahtes (40) von der Tragplatte (12) entgegen der Kraft der Zugfedern (48) und zum Bewegen des Drahtes nach außen in eine Position, in der er das Abnehmen der Druckköpfe (10) erlaubt, umfaßt.
  16. Drucker nach Anspruch 12 oder 15, bei dem der Hubmechanismus Haken (58, 60) aufweist, die längs des Drahtes (36; 40) angeordnet und so an einer Welle (54; 56) montiert sind, daß sie den Draht erfassen und anheben, während sie um die Achse der Welle geschwenkt werden.
  17. Drucker nach den Ansprüchen 12, 15 und 16, bei dem jeder der Hubmechanismen (56, 60) einen mit der Welle (54, 56) verbundenen Hebel (66; 62) aufweist und diese Hebel in gleitender Berührung miteinander stehen, so daß eine Schwenkbewegung des einen Hebels (62) auch eine Schwenkbewegung des anderen Hebels (66) induziert.
  18. Drucker nach einem der Anspruche 1 bis 17, wobei der Drucker ein Tintenstrahldrucker ist.
EP20050112666 2004-12-29 2005-12-21 Drucker mit abnehmbarem Druckkopf Ceased EP1676706B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20050112666 EP1676706B1 (de) 2004-12-29 2005-12-21 Drucker mit abnehmbarem Druckkopf

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04107045 2004-12-29
EP20050112666 EP1676706B1 (de) 2004-12-29 2005-12-21 Drucker mit abnehmbarem Druckkopf

Publications (2)

Publication Number Publication Date
EP1676706A1 EP1676706A1 (de) 2006-07-05
EP1676706B1 true EP1676706B1 (de) 2009-10-28

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Application Number Title Priority Date Filing Date
EP20050112666 Ceased EP1676706B1 (de) 2004-12-29 2005-12-21 Drucker mit abnehmbarem Druckkopf

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991004861A1 (de) * 1989-10-03 1991-04-18 Siemens Aktiengesellschaft Druckmodul für eine tintendruckeinrichtung mit einem tintenvorratsbehälter mit integriertem tintendruckkopf
US5212502A (en) * 1992-03-04 1993-05-18 Eastman Kodak Company Ink jet print head mounting mechanism
US5754206A (en) 1996-02-23 1998-05-19 Scitex Digital Printing, Inc. Low stress droplet generator mount assembly

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Publication number Publication date
EP1676706A1 (de) 2006-07-05

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