EP0382741A1 - Device for monitoring droplet ejection from ejection nozzles of ink-printing heads. - Google Patents
Device for monitoring droplet ejection from ejection nozzles of ink-printing heads.Info
- Publication number
- EP0382741A1 EP0382741A1 EP88907604A EP88907604A EP0382741A1 EP 0382741 A1 EP0382741 A1 EP 0382741A1 EP 88907604 A EP88907604 A EP 88907604A EP 88907604 A EP88907604 A EP 88907604A EP 0382741 A1 EP0382741 A1 EP 0382741A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductor tracks
- ink
- comb
- circuit
- arrangement 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.)
- Granted
Links
- 238000012544 monitoring process Methods 0.000 title claims description 11
- 238000007639 printing Methods 0.000 title claims description 6
- 238000011156 evaluation Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims abstract description 7
- 239000004020 conductor Substances 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 10
- 210000002105 tongue Anatomy 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 230000002745 absorbent Effects 0.000 claims description 3
- 239000002250 absorbent Substances 0.000 claims description 3
- 239000012811 non-conductive material Substances 0.000 claims 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
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- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- XMTQQYYKAHVGBJ-UHFFFAOYSA-N 3-(3,4-DICHLOROPHENYL)-1,1-DIMETHYLUREA Chemical compound CN(C)C(=O)NC1=CC=C(Cl)C(Cl)=C1 XMTQQYYKAHVGBJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000005293 duran Substances 0.000 description 1
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- 239000006260 foam Substances 0.000 description 1
- 150000002343 gold Chemical class 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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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
- B41J2/16579—Detection means therefor, e.g. for nozzle clogging
Definitions
- the invention relates to a method for monitoring the droplet ejection from outlet nozzles of an ink writing head according to the preamble of claim 1 and arrangements for its implementation.
- the representation of characters or of graphic patterns with ink writing devices is known to be based on the fact that individual droplets are ejected in a controlled manner from outlet nozzles of an ink writing head. Such arrangements are referred to as drop-on-demand (DOD) arrangements. Due to a relative movement between a recording medium and the ink writing head, characters or graphic patterns in the form of a large number of individual points are thus built up in a grid pattern on the recording medium. One therefore speaks of a so-called matrix representation or a matrix printing process. The quality of recordings made in this way, the so-called writing quality, depends essentially on the number of droplets by which a character is formed.
- DOD drop-on-demand
- each outlet nozzle is assigned its own drive element, for example in the form of an electrically controllable piezo element. This must have a co-ordinated behavior for an error-free operation together with the ink channel and an ink supply.
- the invention has for its object to provide measures for monitoring the droplet ejection, with which the function of an ink writing head with a plurality of outlet nozzles by determining the impact of ink droplets without a visual check of print patterns is determined, which without additional protective measures, a safe and clear evaluation of the Allow measurement results with little circuitry effort and which only require relatively simple constructive means, in particular the manufacture of the sensor plate, the assembly of the ink droplet sensor and the installation in the ink writing head, but also the use as a test or
- Test facility in production e.g. is advantageously improved as a matching device.
- Fig. 3 shows an embodiment for the electrode comb provided as an ink droplet sensor
- 4 shows a second embodiment for the electrode comb
- FIG. 5 shows examples of an evaluation circuit
- FIG. 8 shows an embodiment for the construction and manufacture of a sensor plate
- FIGS. 9 and 10 show an exemplary embodiment for the practical use of the sensor arrangement.
- a known ink writing head 1 which in the example consists of a nozzle plate 2 with nine outlet nozzles 3, a head part 4 with nine ink channels 5 and drive elements 6 assigned to them, and an ink supply part 7. This is connected via an ink feed 8 to an ink reservoir, not shown here.
- 1 can also be arranged several times in several rows perpendicular to the plane of the drawing. Four such rows would then form a write head with 32 nozzles, the nozzles of the individual rows being offset from one another.
- the ink droplet sensor according to the invention is arranged at a distance 10 from the write head 1.
- the electrode comb has, at least in the region of the point of impact of the ink droplets, a multiplicity of conductor tracks 18 and 19 running parallel in the outlet region of the ink droplets.
- the device for discharging the liquid supplied by the impact of ink droplets exists made of non-conductive porous material; it can be constructed in one layer or preferably from several sub-layers.
- the connection electrodes 13 and 14 are connected to an evaluation circuit 20 which, as will be discussed in more detail later, depending on the impact of one or more ink droplets on the electrode comb 12, emits a corresponding signal, the sensor signal SM.
- FIGS. 2 and 3 show an exemplary embodiment of the electrode comb 12 of the ink droplet sensor in a top view (FIG. 2) and in a sectional view (FIG. 3).
- the electrode comb is formed by two comb parts 121 and 122, the tongue-shaped conductor tracks 18, 19 of which lie next to one another in the region of the points of impact for the ink droplets and form the comb structure.
- the comb parts 121 and 122 with the conductor tracks 18 and 19 are applied here to the suction block 17 consisting of the porous, non-conductive layer.
- Each of these comb parts 121 and 122 is electrically accessible from the outside via the connection electrodes 13 and 14.
- FIG. 3 shows the structure in detail.
- the suction block 17 consists of two partial layers 15 and 16 of absorbent material with the thicknesses S1 and S2.
- An insulating layer in the form of an gold-coated insulating film 21 is laminated onto the uppermost sub-layer 15, which then corresponds to the division ratio T des
- Structured electrode comb and is provided with the conductor tracks 18 and 19. This creates the structure shown in FIGS. 2 and 3.
- the comb parts 121, 122 with the conductor tracks 18 and 19 have a height L; the conductor tracks 18 and 19 each have a width A and are spaced apart B to each other.
- a division ratio T A + B is thus established. If the ink droplet sensor is to detect a single ink drop of diameter D, then T ⁇ D must be formed in order to form an electrical resistance bridge between adjacent conductor tracks 18 and 19 and thus between comb parts 121 and 122.
- Sub-layer 16 a The non-conductive porous sub-layers 15 and 16 act as a kind of suction pump with a capillary effect. The efficiency of this suction pump can be adjusted to specific applications by selecting the porosity and / or the number or the thickness S1, S2 of the partial layers. The following dimensions have proven to be particularly advantageous for the exemplary embodiment shown in FIG. 3:
- H (gold electrode) 1 ⁇ m
- the porosity P1 and P2 of the two layers 15 and 16 is different. It is advantageous if the porosity of the individual layers increases with increasing distance from the electrode comb (P2> P1). This ensures that a liquid transport preferably takes place from the upper sub-layer 15 to the lower sub-layer 16. That has the Advantage that the space near the electrode comb is emptied of ink relatively quickly and that a sequence of individual droplets arriving at short time intervals can thus be reliably detected.
- Duran filter glass for the upper partial layer 15 and so-called Millipore filter paper for the lower partial layer 16 are preferably suitable as materials for the individual partial layers 15 and 16 with different porosities.
- the pore sizes of the upper porous partial layer 15 can be between 0.01 and 0 , 02, the pore sizes of the lower porous sublayer 16 are between 0.005 and 0.01 mm.
- the comb structures described can advantageously be produced by the thin-film or thick-film technique known per se.
- the structures of the electrode comb arrangement are designed as bifilar conductor tracks, which results in the advantage that the conductor tracks of the comb structure are controllable, e.g. can be connected to each other during individual measurement breaks. An example of this is shown in FIG. 4.
- the conductor tracks 181 and 191 of the two comb parts 123 and 124 are meandering on the suction block 17 here. Its structure and the design of the conductor tracks 181 and 191 can be done in the manner described with reference to FIG. 3 hen. As before, the conductor tracks run parallel next to each other in the area where the ink droplets meet. In contrast to the previously described embodiment, the embodiment specified here offers the possibility of providing a second pair of connecting electrodes 23 and 24 in addition to the connecting electrodes 13 and 14 which lead to the outside and by means of which the conductor tracks 181 and 191 can be galvanically connected to one another.
- connection electrodes 23 and 24 are not connected to one another for the duration of a measurement process, that is to say for the duration during which the impact of ink droplets is detected.
- the operation of the detection for the impingement of ink droplets then takes place as described with reference to FIG. 2 and FIG. 3.
- the connections 23 and 24 can now be connected to one another via a switch, not shown here, which is actuated in the measurement pauses, that is to say when no ink droplets are detected. It is thus possible to use the conductor tracks 181 and 191 for heating and thus for evaporating the ink droplets during the measurement pauses with the aid of a current source (not shown here) which can be connected to the connections 13 and 14. This has the advantage that in addition to the capillary action of the suction block, there is also liquid removal by evaporation.
- a circuit arrangement which emits the sensor signal SM with each impact of an ink droplet.
- the circuit shown there essentially consists of a voltage divider, which consists of a fixed resistor 30 and the variable measuring resistor 31. This represents the respective current resistance value between the conductor tracks 18 and 19 (Fig.2) or 181,191 (Fig.4) of the electrode comb, ie the circuit shown is connected at this point to the connecting electrodes 13 and 14 of the electrode comb.
- the tap between the resistors 30, 31 of the voltage divider is connected to the inputs of a comparator 32. This connection takes place in such a way that the voltage value Um established at the tap point of the voltage divider circuit 30, 31 as a respective instantaneous value via a resistor 39 directly to the one input and via an integrating element
- a bistable circuit 37 connected downstream of the comparator 32 forms the sensor signal SM from the output signal of the comparator 32 for a subsequent printer control, which is no longer shown here.
- the circuit works as follows. If an ink droplet hits the electrode comb due to an ejection of an ink droplet stimulated by the printer control in the print head, this is associated with a sudden reduction in resistance. The measuring resistor 31 thus becomes smaller, which leads to the instantaneous value Um briefly becoming smaller than the temporal mean value Umm. In the example according to FIG.
- a brief level change from 1 to 0 occurs at the output of the comparator 32.
- This transition is temporarily stored in the bistable circuit 37 and further processed by the printer controller.
- the bistable circuit 37 is reset via its reset input with the reset signal R and the sensor is thus activated for the impact and evaluation of a next ink droplet from another nozzle of the write head.
- the printer controller By monitoring the time period between the excitation for droplet ejection by the printer controller and the occurrence of the sensor signal, it is possible to check the functionality of the individual nozzles. If there is no sudden change in resistance after a certain period of time, which can be set depending on predetermined parameters, such as printer structure, flight time of the droplets, ink composition, etc., the printer controller recognizes that the excited nozzle is not working.
- the circuit arrangement described works with direct current, i.e. the voltage divider circuit is connected between a positive voltage source and ground.
- this can lead to decomposition of the ink liquid especially when several ink droplets arriving in quick succession are necessary for the evaluation of ink droplets.
- the ink liquid in this case is exposed to a current flow for a period of t ⁇ 100 ms, which can cause electrolytic changes.
- the dye precipitates out of the solvent, which leads to solidification, which means that capillary suction is no longer possible.
- this problem is solved in that the ink droplet sensor is operated with AC voltage.
- An exemplary embodiment of this is shown in FIG. 6.
- the evaluation circuit shown there also has the
- Voltage divider circuit consisting of the fixed resistor 30 and a resistor 31 representing the current resistance value between the conductor tracks.
- the voltage divider circuit 30, 31 is here connected to an AC voltage generator 38.
- a demodulator 33 is connected between the dividing point of the voltage divider circuit 30, 31 and the comparator 32, which in the circuit design selected in FIG.
- Peak value rectifier works. A voltage value is therefore available at its output which corresponds to the current one
- Peak value of the voltage at the dividing point corresponds.
- FIG. 7 shows a detailed circuit structure as an example of an embodiment for the evaluation circuit according to FIG. 6.
- an electrically insulating carrier plate 26 is provided with a metal layer. This is preferably done by evaporating a glass plate with a thickness of 0.1 to 0.8 mm with a base metallization made of Ti, Cu.
- a photoresist layer is applied to both sides of this. Subsequently, the pattern of the electrode comb structure desired later on the sensor plate 25 with the conductor tracks 18, 19 is generated on one side and this is galvanically reinforced to 10 ... 20 ⁇ m Ni. In a subsequent photo-technical step, the area of a spray window 28 is exposed on both sides and the glass is removed in this area after etching off the base metallization etches so that the conductor tracks 18, 19 are now glass-free
- Span spray window 28 In addition, so-called contacting windows 27 are etched free in this glass etching process.
- the sensor plate 25 can be produced with great utility and can be connected and contacted with the suction block in a simple manner. Details will be described with reference to FIGS. 9 and 10.
- Fig. 9 in supervision
- Fig. 10 in a sectional view
- a housing 29 the suction block 17, the sensor plate 25 and contact springs 42 arranged on both sides Housing 29, designed as an electrically non-conductive plastic injection-molded part, serves to accommodate these parts and is in turn fastened in printer chassis 41 with the aid of the latching tongues 40 belonging to the housing.
- the surface quality of the suction block 17 consisting of non-conductive, open-porous material, such as, for example, suction ceramic, filter glass or foam, is subject to certain requirements only with regard to the side facing the ink writing head 1.
- the flatness of this surface should be of the order of magnitude of the pore size of the porous suction block 17 in order to ensure that the flat sensor plate 25 is supported on it.
- the sensor plate 25 has the comb parts 121, 122, the conductor tracks 18, 19, the spray window 28 and two contacting windows 27.
- the mechanical assignment of the sensor plate 25 to the suction block 17, whose side provided with the conductor tracks 18, 19 faces the suction block 17, is done by the multifunctional contact springs 42 arranged on both sides.
- the suction block 17 is inserted into the housing 29 and Subsequent placement of the sensor plate 25 on the suction block 17 this metal Kunststofffe 42 pressed into corresponding insertion openings 43 of the housing 29.
- the contact springs 42 have latching lugs 44 which securely snap into a recess 45 when inserted into the housing 29. This ensures that the three spring tongues 46 formed at one end of the contact springs 42 resiliently rest on the sensor plate 25.
- the two outer spring tongues 46 each press on the support of the sensor plate 25 and guarantee a gap-free support of the sensor plate 25 on the suction block 17.
- the respective middle spring tongue 46 lies in the area of the contacting window 27 and presses directly on the respective contact surface of the electrode comb structure 18 , 19 and thereby establishes the electrical contact.
- the respective other end of the contact springs 42 forms the connection electrode 13 or 14.
- the electrical connection from the electrode comb structure to the electronic evaluation circuit, not shown here, is established via a connection designed as a flat plug 47 for standardized plug sleeves.
- the ink sprayed onto the conductor tracks 18, 19 is drawn capillary into the suction block 17.
- the absorbency of the suction block 17 depends on its suction volume and its material, on the ink and on the frequency of the spray test.
- an opening 48 can be provided in the housing of the device for an additional ink disposal, which is filled with a suction material of higher porosity than that of the suction block 17.
- ink droplets which is associated with a sudden reduction in resistance in the course of the conductor tracks of the electrode comb, is evaluated in a circuit arrangement (20 in FIG. 1) which emits the sensor signal SM with each impact of one or more ink droplets.
- the height of the splash window 28 is adapted to the vertical distance of the outer nozzles of the ink writing head.
- the width of the spray window 28 depends on the horizontal extension of the nozzle exit area of the ink writing head. In the case of a single-row nozzle arrangement, only a narrow, in the case of multi-row, a correspondingly wider spray window 28 is required. It is also possible to orient the spatially separated nozzle rows one after the other towards the spray window 28. This is more advantageous since the spray test of the individual nozzles only takes place successively and not next to one another and a narrow spray window 28 enables a narrow design of the device and thus less overall widening of the printer chassis.
- the ink droplet sensor constructed according to the invention it is advantageous to provide it outside the actual printing area of an ink writing device, for example on the left or right edge of the line.
- the droplet is moved droplet into this position, in which it is opposite the described ink droplet sensor at a constant distance. It is possible and advantageous for the write head to assume this position, for example in the idle state or before each start of writing or printing, and for a monitoring process to precede the start of operation. If a failure of one or more outlet nozzles is found, then a manual rinsing with a cleaning effect provided in many currently known ink writing heads can be carried out in a short time with a cleaning effect.
- the invention has been described above primarily with regard to its use in a printer for monitoring droplet ejection. However, it is within the scope of the invention; Arrangement can also be used to measure and adjust the flight speed of individual ink droplets.
- the described device for detecting ink drops is characterized by a compact, small design which is easy to use or replace in the printer; it also offers the possibility of fully automatic assembly and only requires four different components that can be created with cost-effective technology.
- the arrangement can not only be used very advantageously in inkjet printers which work with multi-nozzle print heads, but is also suitable for economical quality assurance, since it can be used advantageously in the manufacture and long-term testing of multi-nozzle print heads.
Landscapes
- Ink Jet (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Pour le contrôle des gouttes projetées par les buses de sortie d'une tête d'écriture à encre, il est prévu un détecteur de gouttes d'encre, comportant une plaque de détection (12) dont la surface, orientée vers les buses de sortie, se présente sous la forme d'une électrode interdigitale avec des voies conductrices à structure interdigitale (18, 19), qui sont disposées sur un bloc d'aspiration (17) constitué d'au moins une couche poreuse non conductrice; en fonction de la séparation dans la structure interdigitale, la résistance entre des voies conductrices voisines (18, 19) se modifie avec la projection d'une ou plusieurs gouttes; un circuit d'évaluation (20) relié aux voies conductrices (18, 19) contrôle la modification de résistance et produit un signal de détection (SM); la quantité de liquide déposée avec la projection d'une ou plusieurs gouttes est émise par capillarité (17) par l'intermédiaire de la couche poreuse du bloc d'aspiration.For checking the drops projected by the outlet nozzles of an ink writing head, an ink drop detector is provided, comprising a detection plate (12), the surface of which faces towards the outlet nozzles. , is in the form of an interdigital electrode with conductive paths of interdigital structure (18, 19), which are arranged on a suction block (17) consisting of at least one non-conductive porous layer; depending on the separation in the interdigital structure, the resistance between neighboring conductive paths (18, 19) changes with the projection of one or more drops; an evaluation circuit (20) connected to the conductive channels (18, 19) monitors the change in resistance and produces a detection signal (SM); the quantity of liquid deposited with the projection of one or more drops is emitted by capillarity (17) via the porous layer of the suction block.
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873732395 DE3732395A1 (en) | 1987-09-25 | 1987-09-25 | Method and arrangement for monitoring the ejection of droplets from the outlet jets of an ink print head |
DE3732395 | 1987-09-25 | ||
DE3732396 | 1987-09-25 | ||
DE19873732396 DE3732396A1 (en) | 1987-09-25 | 1987-09-25 | Method for monitoring the ejection of droplets from the outlet jets of an ink print head |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0382741A1 true EP0382741A1 (en) | 1990-08-22 |
EP0382741B1 EP0382741B1 (en) | 1993-11-24 |
Family
ID=25860166
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88907604A Expired - Lifetime EP0382741B1 (en) | 1987-09-25 | 1988-09-09 | Device for monitoring droplet ejection from ejection nozzles of ink-printing heads |
EP88907627A Expired - Lifetime EP0389481B1 (en) | 1987-09-25 | 1988-09-20 | Process and arrangement for automatic performance checking of printing ink devices |
EP88908144A Ceased EP0380526A1 (en) | 1987-09-25 | 1988-09-26 | Process and device for determining the printing position of the delivery nozzles of printing ink heads |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88907627A Expired - Lifetime EP0389481B1 (en) | 1987-09-25 | 1988-09-20 | Process and arrangement for automatic performance checking of printing ink devices |
EP88908144A Ceased EP0380526A1 (en) | 1987-09-25 | 1988-09-26 | Process and device for determining the printing position of the delivery nozzles of printing ink heads |
Country Status (4)
Country | Link |
---|---|
EP (3) | EP0382741B1 (en) |
JP (3) | JPH03500271A (en) |
DE (2) | DE3885904D1 (en) |
WO (3) | WO1989002826A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU626457B2 (en) * | 1989-09-18 | 1992-07-30 | Canon Kabushiki Kaisha | Ink jet recording head and ink jet recording apparatus having same |
EP0443832B1 (en) * | 1990-02-23 | 1996-12-18 | Canon Kabushiki Kaisha | Image communicating apparatus |
US5160938A (en) * | 1990-08-06 | 1992-11-03 | Iris Graphics, Inc. | Method and means for calibrating an ink jet printer |
JP3190486B2 (en) * | 1993-07-19 | 2001-07-23 | キヤノン株式会社 | Ink jet recording apparatus and ink jet recording head for the apparatus |
JP2000270129A (en) * | 1999-03-12 | 2000-09-29 | Ryuji Ito | Image printer provided with ink-jet type printer |
DE10027261B4 (en) | 1999-06-28 | 2017-04-27 | Heidelberger Druckmaschinen Ag | Method and apparatus for cleaning a nozzle exit surface on a printhead of an inkjet printer |
DE10028318B4 (en) | 1999-06-28 | 2017-02-16 | Heidelberger Druckmaschinen Ag | Method and apparatus for cleaning a printhead of an inkjet printer |
WO2002053386A1 (en) * | 2000-12-29 | 2002-07-11 | Array Ab | Method and apparatus of direct electrostatic printing |
EP1245399B1 (en) | 2001-03-30 | 2010-03-03 | Hewlett-Packard Company, A Delaware Corporation | Enhanced printer device alignment method and apparatus |
EP1245397B1 (en) * | 2001-03-30 | 2006-06-28 | Hewlett-Packard Company, A Delaware Corporation | Apparatus and method for detecting drops in printer device |
JP5564893B2 (en) * | 2009-10-29 | 2014-08-06 | コニカミノルタ株式会社 | Inkjet recording device |
WO2012084686A1 (en) | 2010-12-21 | 2012-06-28 | Oce-Technologies B.V. | Method for determining maintenance unit performance |
JP6232861B2 (en) * | 2013-09-04 | 2017-11-22 | 株式会社リコー | Image forming apparatus and discharge detection apparatus |
JP7224906B2 (en) * | 2018-01-12 | 2023-02-20 | キヤノン株式会社 | Module substrate cleaning method |
DE102020120541A1 (en) * | 2020-08-04 | 2022-02-10 | Canon Production Printing Holding B.V. | Method and device for checking a cleaning unit |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4067019A (en) * | 1976-06-14 | 1978-01-03 | International Business Machines Corporation | Impact position transducer for ink jet |
DE2905062A1 (en) * | 1979-02-10 | 1980-08-14 | Olympia Werke Ag | Ink jet printer drop speed measurement - by measuring time between pressure generator impulse and drop detection signal |
US4323905A (en) * | 1980-11-21 | 1982-04-06 | Ncr Corporation | Ink droplet sensing means |
US4484199A (en) * | 1982-03-30 | 1984-11-20 | Konishiroku Photo Industry Co., Ltd. | Method and apparatus for detecting failure of an ink jet printing device |
DE3244112A1 (en) * | 1982-11-29 | 1984-05-30 | Olympia Werke Ag, 2940 Wilhelmshaven | Arrangement for testing nozzle outlet openings of ink print heads for blockage or contamination in ink printing mechanisms |
EP0161341B1 (en) * | 1984-05-18 | 1989-10-18 | Siemens Aktiengesellschaft | Device for fastening and contacting for cylindrical piezo-electrical transducers |
US4716422A (en) * | 1985-08-12 | 1987-12-29 | Siemens Aktiengesellschaft | Mechanism for rinsing an ink printing head |
DE3634034C2 (en) * | 1985-10-09 | 1994-08-25 | Seiko Epson Corp | Ink detector for an inkjet printer |
-
1988
- 1988-09-09 DE DE88907604T patent/DE3885904D1/en not_active Expired - Fee Related
- 1988-09-09 WO PCT/DE1988/000558 patent/WO1989002826A1/en active IP Right Grant
- 1988-09-09 JP JP63507541A patent/JPH03500271A/en active Pending
- 1988-09-09 EP EP88907604A patent/EP0382741B1/en not_active Expired - Lifetime
- 1988-09-20 WO PCT/DE1988/000592 patent/WO1989002827A1/en active IP Right Grant
- 1988-09-20 DE DE88907627T patent/DE3888363D1/en not_active Expired - Fee Related
- 1988-09-20 JP JP63507337A patent/JPH03500270A/en active Pending
- 1988-09-20 EP EP88907627A patent/EP0389481B1/en not_active Expired - Lifetime
- 1988-09-26 EP EP88908144A patent/EP0380526A1/en not_active Ceased
- 1988-09-26 WO PCT/DE1988/000594 patent/WO1989002828A1/en not_active Application Discontinuation
- 1988-09-26 JP JP63507546A patent/JPH03500272A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO8902826A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1989002828A1 (en) | 1989-04-06 |
DE3888363D1 (en) | 1994-04-14 |
EP0382741B1 (en) | 1993-11-24 |
JPH03500271A (en) | 1991-01-24 |
JPH03500272A (en) | 1991-01-24 |
DE3885904D1 (en) | 1994-01-05 |
WO1989002826A1 (en) | 1989-04-06 |
EP0389481A1 (en) | 1990-10-03 |
WO1989002827A1 (en) | 1989-04-06 |
EP0389481B1 (en) | 1994-03-09 |
EP0380526A1 (en) | 1990-08-08 |
JPH03500270A (en) | 1991-01-24 |
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