EP0521047B1 - Dispositif d'aspiration et de recouvrement pour tetes d'impression d'une imprimante polychrome - Google Patents

Dispositif d'aspiration et de recouvrement pour tetes d'impression d'une imprimante polychrome Download PDF

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Publication number
EP0521047B1
EP0521047B1 EP91906315A EP91906315A EP0521047B1 EP 0521047 B1 EP0521047 B1 EP 0521047B1 EP 91906315 A EP91906315 A EP 91906315A EP 91906315 A EP91906315 A EP 91906315A EP 0521047 B1 EP0521047 B1 EP 0521047B1
Authority
EP
European Patent Office
Prior art keywords
ink
aspiration
suction
channels
ink jet
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
EP91906315A
Other languages
German (de)
English (en)
Other versions
EP0521047A1 (fr
Inventor
Wilhelm Kirner
Lorenz Thoma
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0521047A1 publication Critical patent/EP0521047A1/fr
Application granted granted Critical
Publication of EP0521047B1 publication Critical patent/EP0521047B1/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
    • 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
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16505—Caps, spittoons or covers for cleaning or preventing drying out
    • B41J2/16508—Caps, spittoons or covers for cleaning or preventing drying out connected with the printer frame

Definitions

  • the invention relates to a suction and cover device for sucking ink from ink print heads of a multicolor ink print device according to the preamble of claim 1.
  • ink printing devices In addition to a large number of other printing devices, ink printing devices have become of increasing interest to the user. The feature of being able to print in color is of great importance for different areas of application.
  • the writing fluids used in a multicolor or color ink print head can dry out during longer pauses in writing.
  • so-called cleaning and sealing stations or suction regeneration devices are provided, which are also used to remove dirt from the nozzle outlet openings of the ink print head in the ink print device.
  • the ink print heads are cleaned at regular intervals and sealed during longer pauses in the ink print device.
  • the cleaning and sealing station has a suction and cover device.
  • an ink meniscus at the nozzle outlet openings usually prevents air from penetrating into the ink supply area of the ink print heads.
  • Suction and cover devices can destroy such blocking menisks by pushing air into the ink outlet openings. This may require additional ventilation procedures.
  • DE-A1-33 16 474, DE-A1-33 16 968, DE-A1-36 04 373, DE-A1-36 11 333, DE-A1-36 33 239, DE-A1-37 26 671, DE-A1-38 10 698 and EP-A1-0 094 220 each know a cleaning and sealing station or a suction regeneration device for ink print heads in ink print devices, with which the nozzle outlet openings of the ink print heads are cleaned, rinsed and used for in different ways longer pauses in writing of the ink printing devices are sealed.
  • FR-A-2 524 844 a suction and cover device of the type mentioned at the beginning for color printers is known, in which there is basically the risk that ink liquids of different colors will be mixed when cleaning and sealing in the area of the nozzle outlet openings. This leads to malfunctions in the printed image, causes unnecessary downtimes of the printing devices and requires additional cleaning processes. To avoid these faults, the suction and covering device known from FR-2 524 844 contains a valve-like device.
  • the present invention is based on the object of constructing a suction and cover device for sucking off ink from color ink print heads of an ink print device, in which a color mixing of those sucked out of the ink print heads Ink in a pressure compensation system of the suction and cover device is prevented.
  • Figure 1 shows the basic structure of an ink printing device 1.
  • This essentially has an ink printing unit 8 arranged on a printer carriage 7, which can be moved parallel to a platen in the form of a platen roller 9.
  • the ink printing unit 8 has four ink printing heads 80 arranged next to one another. Inks of the colors yellow, magenta, cyan and black are used as writing liquids, which can be assigned to the four different ink print heads 80 as desired. However, for reasons relating to the cleaning of the ink print heads 80, it is advisable to assign the colors to the ink print heads 80 from right to left in the order mentioned.
  • the printer carriage 7 is moved back and forth on two parallel guide rods 70 in a manner known per se (for example DE-GM 89 06 727).
  • overshoot areas UEB result on both sides of the print area DB. Their minimum length is essentially determined by the physically required acceleration and braking distances, taking mechanical tolerances into account. In the exemplary embodiment described in FIG. 1, the overshoot area UEB is approximately 40 mm long.
  • a cleaning and sealing station 6 is provided in the ink printing device 1.
  • the cleaning and sealing station 6 is arranged in the left overshoot area UEB.
  • RD station 6 The structure and function of the RD station 6 is described in WO 91/10570 (published on July 25, 1991), which claims the priority of EP application 90 100 373.1 and is therefore considered part of the disclosure of the present application.
  • Essential components are a suction and cover cap, hereinafter referred to as an SA cap, a bellows pump and a switch coupling with a cam disk 20.
  • the pumping action of the bellows pump is used, for example, to pump the ink out of the nozzle outlet openings of the ink print heads 80.
  • it is connected to the SA cap both via a suction channel and via an air hose.
  • the RD station 6 With the RD station 6, however, it is also possible to draw off and dispose of other liquids from various spray devices.
  • the SA cap 4 four are the same for pumping the ink out of the ink print heads 80 of the ink print device 1
  • Large, identically shaped recesses suction openings, cavities
  • these are connected to a disposal container via the suction channel, on the other hand, they are connected to the ambient air via the air hose.
  • the number of recesses in the SA cap 4 of the RD station 6 depends on the number of ink printheads used. If, as in the present case, for example, a four-color print image is to be produced with the ink print device 1, the service treatment of the ink print device 1 must also be designed for the disposal of the required four ink print heads. In order to avoid mixing of the writing liquids during suction from the nozzle outlet openings of the ink print heads, the number of recesses or suction openings is identical to the number of colored writing liquids assigned to the ink print heads.
  • a trough-shaped rubber insert in the form of an elastic cap with a liquid-absorbing insert is arranged in the suction openings.
  • the elastic caps are hermetically sealed over the nozzle outlet openings and seal the nozzle outlet openings of the ink print heads 80.
  • An RD station with these properties therefore enables the RD station to not block the overshoot of the printer carriage in write mode, that the RD station is docked to the ink printing unit in the service position and that ink is sucked out of the nozzle outlet openings and that in the idle state during transport and the RD station is docked during storage, thus securely closing the nozzle outlet openings.
  • FIG. 2 shows a top view of the detailed structure an SA cap 4 with four suction openings (cavities) 40 for the separate suction of the ink from the nozzle outlet openings of the ink print heads 80.
  • FIG two of the suction openings 40 of the rubber insert 41 are inserted and, moreover, one of the rubber inserts 41 is cut open in the longitudinal direction.
  • the SA cap 4 has a rectangular support part 46, for example rounded in the corners, into which the recess 40 of the suction openings are let in, evenly distributed both in length and in width.
  • Each of the suction recesses 40 contains a pressure equalization channel 403, 463 for pressure equalization and a suction channel 461, 401 for discharging the sucked-off ink, as well as a centrally arranged opening 462 for fastening the trough-shaped rubber insert 41.
  • the recess 40 has a preferably oval shape first chamber 400.
  • the trough-shaped rubber insert 41 can be inserted into this oval chamber 400 and fastened to the opening 462.
  • the pressure compensation channel consists of the connection opening 463 with associated chamber 402, the suction channel from the connection opening 461 with associated second chamber 401.
  • the first chamber 400 can also be rectangular with slightly rounded corners. However, it must be ensured here that the rubber insert 41 can continue to be arranged in a form-fitting manner in the first chamber 400.
  • the rubber insert 41 with a sealing lip 410 and an insert 42 has the task, when docking the SA cap 4 to the ink printing unit 8, to seal the nozzle outlet openings of the ink printing heads 80 in such a way that when the ink is sucked off they do not adhere to the docking point between the sealing lip 410 and the Nozzle exit surface of the ink printing unit 8 can escape.
  • the rubber insert 41 has on the one hand (for the suction of the ink) a certain elasticity and on the other hand (for the Docking the SA cap 4) has a certain rigidity.
  • the trough-shaped rubber insert 41 has a trough base 412 forming the trough shape with a web 414 designed as a hollow profile with transverse ribs 413, so that a lamella-like structure is produced. Since the transverse ribs 413 protrude as small elevations into the trough-shaped rubber insert 41, it is achieved that the insert 42 does not lie directly on the trough bottom 412. Two through openings 415, 416, spaced apart y from one another, are also let into the trough bottom 412. The distance y preferably corresponds to 2/3 of the total length of the longitudinal axis of the trough base 412.
  • the first passage opening 415 opens into the pressure compensation channel 403, which is connected to the ventilation nozzle 43.
  • the second passage opening 416 opens into the suction channel 401, which is connected to the suction nozzle 45.
  • FIG. 3 shows a cross section through the SA cap 4 according to FIG. 2 along a section line IV... IV.
  • the carrier part 46 of the SA cap 4 is covered on the rear with a cover plate 47 by which the chambers 401, 402, 403 are closed .
  • the cover plate 47 has a recess 470 which is covered with an oval sieve 48.
  • the cover plate 47 can be connected fixedly or detachably to the carrier part 46. It must only be ensured that no ink can escape from the SA cap 4.
  • the recess 470 forms with the chambers 401 of the suction channels of the recesses 40 and the sieve 48 a common removal channel, which has the suction nozzle 45 as an outlet.
  • the differently colored writing fluids thus obtained from the SA cap 4 via the rubber inserts 41 arranged in the cavities 40 are passed through the sieve 48 and a catch basin 49 arranged in the carrier part 46 through a drain 450 of the suction nozzle 45 opening into the catch basin 49 suctioned into the disposal container.
  • the catch basin 49 is preferably in the middle of the support part 46 arranged between two adjacent chambers 401 of the suction channels of the recesses 40.
  • FIG. 4 shows a rear view of the support part 46 that has not been welded to the cover plate 47.
  • the catch basin 49 is then, like the chambers 401, the oval recess 464 for the sieve 48 a component of the channel system connected to the suction connection 45.
  • these are to be staged via a branch channel 465 which is recessed into the carrier part 46 and is arranged in stages between the pressure compensation channels 403 a pressure equalization channel system.
  • the duct system of the ventilation nozzle 43 is also closed by welding the cover plate 47 to the carrier part 46.
  • the task of the branch channels 465, which are stepped apart from one another between the pressure compensation channels, is explained in connection with the following functional description of the SA cap 4.
  • the SA cap 4 is printed on the ink printing unit 8 with the ventilation valve open.
  • the control of the ventilation valve is again carried out by the control device in the ink pressure device 1.
  • the ventilation valve is closed and a pumping process is initiated.
  • the ink is sucked out of the nozzle outlet openings of the ink print heads 80 with the aid of a negative pressure resulting from the closing of the ventilation valve.
  • the ink emerging from the nozzle orifices is initially taken up by the insert 42. If the liquid-absorbing insert 42 is saturated with the ink, the remaining ink passes through the second passage opening 416 of the rubber insert 41, the suction channel 401 and the sieve 48 into the collecting basin 49 and then flows through the drain 450 of the suction nozzle 45 into a disposal container.
  • the ink in the suction openings 40 rises during the suction process in the SA cap 4 designed for the disposal of the four ink colors (black, cyan, magenta, yellow) in the suction openings 40 provided for this purpose.
  • the ink channel cross section for the black ink is larger than the ink channel cross section for blue, red and yellow ink
  • the black ink in the corresponding suction opening 40 can be used for a predetermined suction interval as far as the pressure equalization channel 403 and via the ventilation pipe 43 into the air hose 53 of the RD station 6.
  • the excess ink remaining in the cavities 40 must still be suctioned off. This is necessary because otherwise when the SA cap 4 is put on the ink printing unit 8 again, the ink which has remained in the cavities 40 or caps 41 and possibly dried up is deposited again on the nozzle exit surface of the ink printing unit and clogs it. So that in the event that ink still settles on the nozzle exit surface of the ink printing unit 8, no print image disturbances can occur, in addition to sucking off the excess ink from the cavities 40 of the SA cap 4, the nozzle outlet surface of the ink printing unit 8 after each flushing and filling process regularly wiped when the printer carriage 7 moves out of the service and rest area according to FIG.
  • the transverse ribs 413 projecting into the rubber insert 41 are arranged on the trough bottom 412.
  • the screen 48 is constructed capillary. The barrier pressure on the screen 48 can be influenced by dimensioning the drain 450 of the suction port 45 by acting as a throttle.

Landscapes

  • Ink Jet (AREA)

Abstract

Le dispositif d'aspiration et de recouvrement (4) pour l'aspiration de l'encre provenant des têtes d'impression polychrome (80) présente des orifices d'aspiration (40) auxquels sont associés des canaux d'aspiration (401) et des canaux d'équilibre de pression (403). Afin d'éviter un mélange de l'encre pénétrant dans les canaux d'équilibre de pression (403) pendant la phase d'aspiration du capot d'aspiration et de recouvrement (4), des canaux de dérivation (465) décalés et étagés sont disposés entre les canaux d'équilibre de pression (403).

Claims (2)

  1. Dispositif d'aspiration et de recouvrement pour aspirer de l'encre à partir de têtes d'impression à encre d'un dispositif d'impression à encre polychrome, ayant les caractéristiques suivantes :
    a) des ouvertures d'aspiration (40) prévues de façon correspondant au nombre des têtes d'impression à encre (80), ouvertures dans lesquelles est agencé un capuchon élastique (41) pouvant être disposé contre les têtes d'impression à encre (80),
    b) des canaux d'aspiration (401) associés aux ouvertures d'aspiration (40), qui sont reliés, par l'intermédiaire d'un canal d'évacuation commun (49,470), à un dispositif d'aspiration,
    caractérisé par :
       c) des canaux de compensation de pression (403) associés aux ouvertures d'aspiration (40), canaux qui sont reliés à un dispositif de compensation de pression (43,55) par l'intermédiaire de canaux latéraux (465) décalés de façon étagée entre les canaux de compensation de pression.
  2. Dispositif d'aspiration et de recouvrement selon la revendication 1,
    caractérisé en ce que les canaux latéraux (465) sont agencés en étant écartés au maximum les uns des autres.
EP91906315A 1990-03-20 1991-03-13 Dispositif d'aspiration et de recouvrement pour tetes d'impression d'une imprimante polychrome Expired - Lifetime EP0521047B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP90105266 1990-03-20
EP90105266 1990-03-20

Publications (2)

Publication Number Publication Date
EP0521047A1 EP0521047A1 (fr) 1993-01-07
EP0521047B1 true EP0521047B1 (fr) 1994-01-05

Family

ID=8203780

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91906315A Expired - Lifetime EP0521047B1 (fr) 1990-03-20 1991-03-13 Dispositif d'aspiration et de recouvrement pour tetes d'impression d'une imprimante polychrome

Country Status (4)

Country Link
EP (1) EP0521047B1 (fr)
JP (1) JPH05505984A (fr)
DE (1) DE59100818D1 (fr)
WO (1) WO1991014576A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60031215T2 (de) * 1999-09-07 2007-08-23 Seiko Epson Corp. Tintenstrahlaufzeichnungsgerät, Verfahren zur Tintenabfuhr aus der im Gerät eingebauten Verschliessvorrichtung und für das Gerät verwendete Tintenzusammenstellung
JP2001088326A (ja) * 1999-09-27 2001-04-03 Nec Niigata Ltd インクジェットプリンタのヘッドクリーニング装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510510A (en) * 1982-04-13 1985-04-09 Canon Kabushiki Kaisha Inkjet printer
JPS58194568A (ja) * 1982-05-11 1983-11-12 Canon Inc 吸引回複装置
DE3611333A1 (de) * 1985-04-05 1986-10-16 Canon K.K., Tokio/Tokyo Fluessigkeitsstrahl-aufzeichnungsgeraet und in dem geraet verwendete saug-regeneriereinrichtung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Vol. 13, No. 122 (M-807)(3470), 27 March 1989, JP-A-63295265 *
Patent Abstracts of Japan, Vol. 9, No. 330 (M-442)(2053), 25 December 1985, JP-A-60162656 *

Also Published As

Publication number Publication date
WO1991014576A1 (fr) 1991-10-03
JPH05505984A (ja) 1993-09-02
DE59100818D1 (de) 1994-02-17
EP0521047A1 (fr) 1993-01-07

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