EP0521047A1 - Saug- und abdeckeinrichtung für tintendruckköpfe einer mehrfarben-tintendruckeinrichtung. - Google Patents
Saug- und abdeckeinrichtung für tintendruckköpfe einer mehrfarben-tintendruckeinrichtung.Info
- Publication number
- EP0521047A1 EP0521047A1 EP91906315A EP91906315A EP0521047A1 EP 0521047 A1 EP0521047 A1 EP 0521047A1 EP 91906315 A EP91906315 A EP 91906315A EP 91906315 A EP91906315 A EP 91906315A EP 0521047 A1 EP0521047 A1 EP 0521047A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ink
- suction
- print heads
- 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.)
- Granted
Links
- 238000007641 inkjet printing Methods 0.000 title 1
- 238000000605 extraction Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- PLXMOAALOJOTIY-FPTXNFDTSA-N Aesculin Natural products OC[C@@H]1[C@@H](O)[C@H](O)[C@@H](O)[C@H](O)[C@H]1Oc2cc3C=CC(=O)Oc3cc2O PLXMOAALOJOTIY-FPTXNFDTSA-N 0.000 abstract 1
- 239000000976 ink Substances 0.000 description 119
- 238000007639 printing Methods 0.000 description 29
- 229920001971 elastomer Polymers 0.000 description 17
- 238000009423 ventilation Methods 0.000 description 12
- 239000003570 air Substances 0.000 description 10
- 238000004140 cleaning Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 239000003086 colorant Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005086 pumping Methods 0.000 description 4
- 238000003032 molecular docking Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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 suctioning ink from ink printheads of a multicolor ink printing device according to 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 liquids used in a multicolor or color ink print head preferably inks of the colors yellow, cyan, magenta and black (DE-Al-37 36 916), 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 writing of the ink print device.
- the cleaning and sealing station has a suction and cover device.
- suction and cover devices are used in color printers, there is a risk that when cleaning and sealing in the area of the nozzle outlet openings, ink liquids of different colors are mixed, which leads to malfunctions in the print image, causes unnecessary downtimes of the printing devices and additional cleaning processes required.
- an ink meniscus on the nozzle usually prevents outlet openings an entry of air into the ink supply area of the ink printheads.
- Suction and cover devices can destroy such blocking menisks by pushing air into the ink outlet openings. This may require additional ventilation procedures.
- DE-Al-33 16 474, DE-Al-33 16 968, DE-Al-36 04 373, DE-Al-36 11 333, DE-Al-36 33 239, DE-Al-37 26 671, DE-Al-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 nozzle outlet openings of the ink print heads are cleaned, rinsed and cleaned in different ways these are sealed for longer pauses in writing by the ink printing devices.
- 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 color mixing of the ink drawn from the ink print heads is prevented in a pressure compensation system of the suction and cover device.
- FIG. 1 shows a plan view of an ink printing device
- FIG. 2 shows the structure of a suction and cover cap
- FIG. 3 shows the suction and cover cap in a sectional view
- Figure 4 shows the structure of a carrier part of the suction and cover cap in a rear view.
- FIG. 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 side by side. 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 recommended 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 (eg DE-GM 89 06 727).
- overshoot areas UEB result on both sides of the pressure 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 example in the left overshoot area UEB.
- RD station 6 The structure and function of the RD station 6 is described in EP application 90 100 373.1, which is considered to be part of the disclosure of the present application.
- Essential components are a suction and cover cap, hereinafter referred to as SA cap, a bellows pump and a switch coupling with a cam disk
- 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.
- Cavities arranged. On the one hand, 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, with the ink printing device
- the service treatment of the ink print device 1 must also be designed for the disposal of the required four ink print heads.
- the writing liquids during suction from the nozzle outlet openings of the ink In order to mix the writing liquids during suction from the nozzle outlet openings of the ink
- the number of recesses or suction openings is identical to the number of colored writing fluids used which are 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. After docking, the elastic caps are placed over the nozzle outlet openings and
- An RD station with these properties thus enables the RD station to not block the overshoot of the 30 printer carriage, that the RD station is docked to the ink printing unit in the service mode and ink is sucked out of the nozzle outlet openings and that i In the idle state during transport and storage, the RD station is docked and thus the nozzle outlet openings are secure
- Figure 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.
- the rubber insert 41 is inserted in two of the suction openings 40 and, moreover, one of the rubber inserts 41 is cut open in the longitudinal direction.
- the SA cap 4 has a rectangular, for example rounded in the corners support member 46, in which the recess 40 of the suction openings are embedded 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 draining off the sucked-off ink, as well as a centrally arranged opening 462 for fastening the trough-shaped rubber insert 41.
- the recess has a recess for receiving the trough-shaped rubber insert 41 40 a preferably oval first chamber 400. In this oval chamber 400, the trough-shaped rubber insert 41 can be inserted and fixed to the opening 462.
- the pressure equalization channel consists of the connecting opening 463 with the associated chamber 402, the suction channel from the connecting opening 461 with the associated second chamber 401.
- the first chamber 400 can also be rectangular with slightly rounded corners. Here, however, it must be ensured 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 of sealing the nozzle outlet openings of the ink print heads 80 when the SA cap 4 is docked onto the ink printing unit 8, so that when the ink is sucked off, the ink does 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 rest 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 back with a cover plate 47 through 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 is only necessary to ensure 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 extraction channel which has the suction nozzle 45 as an outlet.
- the variously 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 collecting basin 49 arranged in the carrier part 46 through a drain opening into the collecting basin 49 450 of the suction nozzle 45 sucked 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 which is not welded to the cover plate 47.
- the collecting basin 49 is then like the chambers 401 and the oval recess 464 for the sieve 48 is part of the channel system connected to the suction nozzle 45.
- these are via a branch channel which is let into the carrier part 46 and is arranged in stages between the pressure compensation channels 403 465 connected to each other to form a pressure compensation duct 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 pressed against 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 then 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 vacuum created by 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 reaches the collecting basin 49 via the second passage opening 416 of the rubber insert 41, the suction channel 401 and the sieve 48 and then flows in via the drain 450 of the suction nozzle 45 a disposal container.
- the ink print heads 80 By sucking the ink out of the ink print heads 80, it 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. Due to different ink channel cross sections of the ink print heads 80 (for example, the ink channel cross section for the black ink is larger than the ink channel cross section for blue, red and yellow ink), the ink in the suction openings 40 rises differently. In particular, the black ink in the corresponding suction opening 40 can be used for a predetermined suction interval
- the ink print heads 80 have been rinsed sufficiently and then filled, the excess ink remaining in the cavities 40 must still be suctioned off. This is necessary because otherwise when the SA cap 4 is re-applied to the ink printing unit 8, the ink which has remained in the cavities 40 or caps 41 and possibly dried up again settles 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 the filling process when the printer carriage 7 moves out of the service and rest area according to FIG. 1 is wiped regularly.
- the suction of the excess ink from the suction openings or cavities 40 of the SA cap 4 begins with the venting valve being opened again during the pumping process.
- the air drawn thereby pushes the ink out of the rubber insert 41 and the recesses 40. If there is black ink in the pressure compensation channel 403, it must be ensured that the black ink does not come into contact with the yellow ink in the SA cap 4, for example comes and thereby occur when the nozzle exit surface of the ink print head 80 for the yellow color becomes dirty.
- 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)
Description
Claims
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 true EP0521047A1 (de) | 1993-01-07 |
EP0521047B1 EP0521047B1 (de) | 1994-01-05 |
Family
ID=8203780
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91906315A Expired - Lifetime EP0521047B1 (de) | 1990-03-20 | 1991-03-13 | Saug- und abdeckeinrichtung für tintendruckköpfe einer mehrfarben-tintendruckeinrichtung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0521047B1 (de) |
JP (1) | JPH05505984A (de) |
DE (1) | DE59100818D1 (de) |
WO (1) | WO1991014576A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1083052B1 (de) * | 1999-09-07 | 2006-10-11 | Seiko Epson Corporation | 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)
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 |
-
1991
- 1991-03-13 EP EP91906315A patent/EP0521047B1/de not_active Expired - Lifetime
- 1991-03-13 DE DE91906315T patent/DE59100818D1/de not_active Expired - Fee Related
- 1991-03-13 JP JP91505650A patent/JPH05505984A/ja active Pending
- 1991-03-13 WO PCT/DE1991/000226 patent/WO1991014576A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9114576A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE59100818D1 (de) | 1994-02-17 |
JPH05505984A (ja) | 1993-09-02 |
WO1991014576A1 (de) | 1991-10-03 |
EP0521047B1 (de) | 1994-01-05 |
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