EP0142265A1 - Hydraulic systems for ink jet printers - Google Patents
Hydraulic systems for ink jet printers Download PDFInfo
- Publication number
- EP0142265A1 EP0142265A1 EP84306916A EP84306916A EP0142265A1 EP 0142265 A1 EP0142265 A1 EP 0142265A1 EP 84306916 A EP84306916 A EP 84306916A EP 84306916 A EP84306916 A EP 84306916A EP 0142265 A1 EP0142265 A1 EP 0142265A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid
- tube
- viscosity
- ink
- supply line
- 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
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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
Definitions
- This invention relates to hydraulic systems, suitably to ink supply systems for ink jet printers.
- ink is conveyed from a reservoir to a print head where the ink is forced through a nozzle at high pressure and broken up into droplets by an ultrasonic vibrator. Droplets emerging from the nozzle are charged by amounts which suit their print positions on a target and the charged droplets are then deflected on to the target by an electrostatic field. Uncharged droplets are returned to the reservoir.
- a hydraulic system comprising a viscometer which includes an upstanding tube connected to a supply line for liquid and an element which is movable upwardly and downwardly within the tube, and control means which are adapted to control the flow of liquid from the supply line to the tube, the element being moved to an upper part.of the tube by a sufficient upwards flow of liquid from the supply line and descending through the liquid when the upwards flow of liquid is terminated, and the control means being further adapted to determine the time taken for the element to descend through a predetermined distance through liquid within the tube, which time is representative of the viscosity of the liquid in the tube.
- means are provided for charging the liquid in the system with a component which causes a change in the viscosity thereof, the control means being arranged to effect a comparison between a desired viscosity and the viscosity represented by the said time taken for the element to descend through the liquid and to generate a control signal for activating the charging means if the comparison reveals a difference between the two viscosities, whereby the liquid is charged with the said component and the difference between the two viscosities is reduced.
- an ink system is designed to convey ink between a reservoir 1 and a print head 3 of an ink jet printer.
- head 3 includes an ink container 5 having an inlet 7' at an upper end thereof, an outlet orifice 9 at a lower end, and a bleed outlet 11.
- ink in the container 5 is subjected to a pressure which forces a jet of ink through the orifice 9. Vibration of the vibrator 13 ensures that the jet breaks up into droplets of uniform size.
- an electrode 15 for charging droplets by an amount which suits their print,positions on a target and a pair of electrodes 17 for deflecting charged droplets on to the target (not shown).
- a gutter 19 is provided for collecting uncharged droplets, which are not deflected on to the target.
- the reservoir 1 is provided with a cartridge 21 containing ink for replenishing the ink stored within the reservoir. Also mounted on the reservoir 1 is a make-up cartridge 23 containing solvents for adding to ink within the system, as hereinafter described.
- the pump 27, which is a gear pump of the suction shoe type, has an inlet connected to the reservoir 1 and an outlet connected to the head 3 via a filter damper 33, a pressure regulator 35 and a jet run solenoid valve 37.
- the filter damper 33 serves both to filter ink from the reservoir 1 and to dampen cyclical variations in the rate of flow of ink from the pump 27.
- the pressure regulator 35 maintains the pressure of ink supplied to the head 3 at a predetermined value. A visual indication of this pressure is provided by a pressure gauge 39. To ensure that the pressure of ink does not rise above 60 pounds per square inch, a pressure relief valve 41 connects the output of the pump 27 to the reservoir 1 by means hereinafter described.
- the pump 29 On the suction side of the system, the pump 29 has an inlet connected to the gutter 19 via a gutter filter 47 and an outlet connected directly to the reservoir 1.
- the pump 29 is a gear pump of the cavity plate type.
- the inlet to the pump is connected to the outlet of the pump 27 via a bleed line 49 and the pressure relief valve 41.
- a bleed control orifice 51 which is preset to allow a predetermined flow of ink to the pump 29.
- the junction between the bleed line 49 and the valve 41 is connected to the reservoir 1 by a further pressure relief valve 53, which opens if the pressure of ink in the line 49 exceeds 1 pound per square inch.
- Operation of the motor 31 and the valves 37 and 45 is controlled by a main microprocessor (not shown) which is linked to the print microprocessor.
- a viscometer 55 has its inlet connected to the bleed line 49 by a normally closed solenoid valve 57 and its outlet directly connected to the reservoir 1.
- the viscometer 55 includes a stainless steel ball 58 which is movable upwardly and downwardly within an upstanding tube 59 of ground glass. At an upper end of the tube 59 there is a flared portion 61, whilst a seat 63 for the ball 57 is provided near to a lower end of the tube.
- a ball detector coil 65 surrounds a section of the tube 59 immediately above the seat 63.
- the ink make up cartridge 23, referred to above, contains solvents which are added to the ink when a loss of solvents is detected by the viscometer 55. Solvents from the cartridge 23 are supplied to the line between the pump 29 and the gutter 19 via a normally closed make-up solenoid valve 67.
- the control circuit of Figure 3 includes a single chip microcomputer 69 having inputs which are supplied with data representing the current and desired viscosities of ink in the system and outputs which supply control signals for removing any discrepancy between current and desired viscosities.
- a first input to the microcomputer 69 is connected to a cartridge memory device 71 which stores data relating to various kinds of ink and the viscosities thereof for optimum printing results.
- a second input to the microcomputer is connected to a sensor 73, whose input is connected to the ball detector coil 65, referred to above. Further inputs are connected to a temperature sensor 75 and associated analogue/digital converter 77 and to a timer 79.
- Outputs from the microcomputer 69 are connected to the make-up solenoid valve 67 and to the solenoid valve 57, respectively.
- the microcomputer 69 is programmed to activate the viscometer 55, to interpret data relating to viscosity and associated parameters applied to the inputs thereof, and to provide control signals for actuating the make-up solenoid valve 67, as hereinafter described.
- the solenoid valves 57 and 67 are normally closed and the jet run solenoid valve 37 is normally open. Initially, the bleed solenoid valve 45 is also open.
- ink from the reservoir 1 is pumped to the container 5 in the head 3 via the filter damper 33, the pressure regulator 35 and the jet run solenoid valve 37.
- the pressure applied to ink within the container 5 forces a jet of ink downwardly via the orifice 9 to the gutter 19.
- a mixture of ink and air is returned to the reservoir 1 via the bleed outlet 11 of the container 5, the bleed line 43 and the bleed solenoid valve 45.
- the bleed solenoid valve 45 is closed.
- ink at an initial pressure of 1 p.s.i. is supplied from the outlet of the pump 27 to the inlet to the pump 29 via the pressure relief valve 41, the bleed line 49 and the bleed control orifice 51.
- This supply of ink seals internal clearances within the pump 29. Accordingly, the efficiency of the pump 29 as an air pump is increased, a higher suction is applied to the gutter 19, and a mixture of air and unused liquid is drawn from the gutter.
- the orifice 51 is pre-set to allow a predetermined flow of ink along the bleed line 49, this predetermined flow being sufficient to ensure that the pump 29 is adequately lubricated.
- the microcomputer 69 initiates a check on the viscosity of ink in the system.
- a signal from th ⁇ microcomputer 69 is applied to the solenoid valve 57, causing the valve to open and to allow ink to flow from the bleed line 49 to the viscometer 55.
- Ink flows upwardly through the tube 59 of the viscometer 55, forcing the steel ball 58 upwardly into the flared portion 61 at the top of the tube.
- the ball remains in the flared portion 61, supported by the upwards flow of ink, whilst ink continues to flow upwardly past the ball and then outwardly from the tube 59 to the reservoir 1.
- the presence of the flared portion 61 means there is sufficient space for any solid particles in the ink to pass between the wall of the tube 59 and to return to the reservoir 1.
- the microcomputer 69 activates the timer 79 and at the same time applies a further signal to the valve 57, causing the valve to close.
- the ball 58 descends slowly within the tube 59 at a rate dependent upon the viscosity of ink in the tube.
- the ball detector coil 65 Movement of the ball 58 through the coil 65 is sensed by the sensor 73, which applies an input signal to the microcomputer 69.
- a computation of the viscosity of the ink is made from data representing the time between the closing of solenoid valve 57 and the arrival of the ball 58 at the coil 65, data representing the ambient temperature or the temperature of the ink, supplied by the temperature sensor 75 and the analogue digital converter 77, and data stored in the memory device 71 and representing the relationship between the viscosity of the ink, the time taken for the ball 58 to descend through the tube 59 and the ambient temperature.
- a comparison is then made between the computed viscosity and data representing the optimum viscosity, also stored in the memory device 71.
- a similar computation of viscosity is made at intervals of 15 minutes. Each time there is a discrepancy between the computed and optimum viscosities, a fresh volume of solvents is supplied from the make-up cartridge 23. If the computed viscosity equals the optimum viscosity, the solenoid valve 67 remains closed so that no solvents are added.
- Coates Black MEK One ink suitable for use in the ink jet printer of Figures 1 to 3 is known as "Coates Black MEK”.
- this ink has a viscosity which varies linearly with temperature between 20 0 C and 45 0 C, the viscosity falling from approximately 3.8 c.p. at a temperature of 20 0 C to approximately 2.0 c.p. at 45°C.
- the viscosity of this ink and the time taken for the ball to fall through the predetermined distance within the tube 59 of the viscometer 59, as shown in the graph forming Figure 4B.
- the printer was then operated over a second 12 hour period with the microcomputer 69 re-connected to the solenoid valve 57.
- the valve 57 was therefore opened and the viscosity checked in the manner described above. It will be seen from Figure 4D that the effect of periodically checking the viscosity and adding fresh solvent, when necessary, is to restrict variation in the viscosity and values between 3.9 and 4.0 c.p.
Landscapes
- Ink Jet (AREA)
Abstract
Description
- This invention relates to hydraulic systems, suitably to ink supply systems for ink jet printers.
- In a continuous ink jet printer, ink is conveyed from a reservoir to a print head where the ink is forced through a nozzle at high pressure and broken up into droplets by an ultrasonic vibrator. Droplets emerging from the nozzle are charged by amounts which suit their print positions on a target and the charged droplets are then deflected on to the target by an electrostatic field. Uncharged droplets are returned to the reservoir.
- During operation of the printer, volatile solvents are lost from the ink by evaporation so that the composition and physical properties of the ink are changed. It is desirable therefore that the composition of the ink should be monitored and that any deficiency in the proportion of solvents should be made good.
- Problems arising from loss of solvents or other components arise in other hydraulic systems.
- According to the present invention there is provided a hydraulic system comprising a viscometer which includes an upstanding tube connected to a supply line for liquid and an element which is movable upwardly and downwardly within the tube, and control means which are adapted to control the flow of liquid from the supply line to the tube, the element being moved to an upper part.of the tube by a sufficient upwards flow of liquid from the supply line and descending through the liquid when the upwards flow of liquid is terminated, and the control means being further adapted to determine the time taken for the element to descend through a predetermined distance through liquid within the tube, which time is representative of the viscosity of the liquid in the tube.
- Preferably, means are provided for charging the liquid in the system with a component which causes a change in the viscosity thereof, the control means being arranged to effect a comparison between a desired viscosity and the viscosity represented by the said time taken for the element to descend through the liquid and to generate a control signal for activating the charging means if the comparison reveals a difference between the two viscosities, whereby the liquid is charged with the said component and the difference between the two viscosities is reduced.
- The invention will now be described, by way of example, with reference to the accompanying drawings, in which:-
- Figure.1 is a schematic drawing of an ink jet printer including an ink system according to the invention;
- Figure 2 is a viscometer included in the system of Figure 1;
- Figure 3 is a block diagram of an electrical control circuit associated with the printer of Figure 1; and
- Figures 4A to 4D are graphs relating to the operation of the printer of Figure 1.
- Referring to Figure 1 of the drawings, an ink system according to the invention is designed to convey ink between a reservoir 1 and a
print head 3 of an ink jet printer. Included in thehead 3 is anink container 5 having an inlet 7' at an upper end thereof, anoutlet orifice 9 at a lower end, and ableed outlet 11. Avibrator 13, connected to a piezoelectric transducer (not shown), extends downwardly into thecontainer 5. As hereinafter described, ink in thecontainer 5 is subjected to a pressure which forces a jet of ink through theorifice 9. Vibration of thevibrator 13 ensures that the jet breaks up into droplets of uniform size. Below thecontainer 5 there is an electrode 15 for charging droplets by an amount which suits their print,positions on a target and a pair ofelectrodes 17 for deflecting charged droplets on to the target (not shown). The charge applied to each droplet, and hence the location at which it strikes the target, depends of course upon the instantaenous magnitude of the potential applied to the electrode 15. This potential is determined by an output from a print microprocessor (not shown). Agutter 19 is provided for collecting uncharged droplets, which are not deflected on to the target. - In the present system, the reservoir 1 is provided with a
cartridge 21 containing ink for replenishing the ink stored within the reservoir. Also mounted on the reservoir 1 is a make-up cartridge 23 containing solvents for adding to ink within the system, as hereinafter described. - A double ended
pump 25 serves to pump ink from the reservoir 1 to theprint head 3 and to return unused ink from the head to the reserved. Thepump 25 includes afirst gear pump 27, which is connected into the high pressure side of the system, and asecond pump 29, which is on the suction side. Rotary parts of thepumps motor 31. - The
pump 27, which is a gear pump of the suction shoe type, has an inlet connected to the reservoir 1 and an outlet connected to thehead 3 via afilter damper 33, apressure regulator 35 and a jetrun solenoid valve 37. Thefilter damper 33 serves both to filter ink from the reservoir 1 and to dampen cyclical variations in the rate of flow of ink from thepump 27. Thepressure regulator 35 maintains the pressure of ink supplied to thehead 3 at a predetermined value. A visual indication of this pressure is provided by a pressure gauge 39. To ensure that the pressure of ink does not rise above 60 pounds per square inch, apressure relief valve 41 connects the output of thepump 27 to the reservoir 1 by means hereinafter described. - A
bleed line 43 is provided for returning a mixture of ink and air from the containers of thehead 3 to the reservoir 1 at the beginning of a printing operation. Connected into theline 43 is a bleedsolenoid valve 45. - On the suction side of the system, the
pump 29 has an inlet connected to thegutter 19 via agutter filter 47 and an outlet connected directly to the reservoir 1. Thepump 29 is a gear pump of the cavity plate type. - To ensure that the
pump 29 applies sufficient suction to thehead 3 and is adequately lubricated, the inlet to the pump is connected to the outlet of thepump 27 via a bleed line 49 and thepressure relief valve 41. Included in the line 49 is ableed control orifice 51 which is preset to allow a predetermined flow of ink to thepump 29. The junction between the bleed line 49 and thevalve 41 is connected to the reservoir 1 by a further pressure relief valve 53, which opens if the pressure of ink in the line 49 exceeds 1 pound per square inch. - Operation of the
motor 31 and thevalves - In use of the present system, it is important to replace volatile solvents lost from the ink by evaporation in the
head 3. Such loss of solvents is detected by detecting changes in the viscosity of the ink, which varies with changes in composition. Means are then provided for adding fresh solvents as necessary. - Referring now to Figures 1 and 2, a
viscometer 55 has its inlet connected to the bleed line 49 by a normally closedsolenoid valve 57 and its outlet directly connected to the reservoir 1. Theviscometer 55 includes astainless steel ball 58 which is movable upwardly and downwardly within anupstanding tube 59 of ground glass. At an upper end of thetube 59 there is a flaredportion 61, whilst aseat 63 for theball 57 is provided near to a lower end of the tube. Aball detector coil 65 surrounds a section of thetube 59 immediately above theseat 63. - The ink make up
cartridge 23, referred to above, contains solvents which are added to the ink when a loss of solvents is detected by theviscometer 55. Solvents from thecartridge 23 are supplied to the line between thepump 29 and thegutter 19 via a normally closed make-up solenoid valve 67. - Associated with the
viscometer 55 and thevalve 67 is an electrical control circuit, shown in Figure 3 of the drawings. - The control circuit of Figure 3 includes a single chip microcomputer 69 having inputs which are supplied with data representing the current and desired viscosities of ink in the system and outputs which supply control signals for removing any discrepancy between current and desired viscosities. Thus, a first input to the microcomputer 69 is connected to a
cartridge memory device 71 which stores data relating to various kinds of ink and the viscosities thereof for optimum printing results. A second input to the microcomputer is connected to asensor 73, whose input is connected to theball detector coil 65, referred to above. Further inputs are connected to atemperature sensor 75 and associated analogue/digital converter 77 and to atimer 79. Outputs from the microcomputer 69 are connected to the make-up solenoid valve 67 and to thesolenoid valve 57, respectively. - The microcomputer 69 is programmed to activate the
viscometer 55, to interpret data relating to viscosity and associated parameters applied to the inputs thereof, and to provide control signals for actuating the make-up solenoid valve 67, as hereinafter described. - In using the present system, the
solenoid valves solenoid valve 37 is normally open. Initially, thebleed solenoid valve 45 is also open. - Accordingly, when the
motor 31 is first energised, ink from the reservoir 1 is pumped to thecontainer 5 in thehead 3 via thefilter damper 33, thepressure regulator 35 and the jet runsolenoid valve 37. The pressure applied to ink within thecontainer 5 forces a jet of ink downwardly via theorifice 9 to thegutter 19. A mixture of ink and air is returned to the reservoir 1 via thebleed outlet 11 of thecontainer 5, thebleed line 43 and thebleed solenoid valve 45. When all of the air has been exhausted from thecontainer 5, thebleed solenoid valve 45 is closed. - Printing can now be commenced by energising the piezoelectric transducer so that the
vibrator 13 causes the jet of ink from theorifice 7 to ,be broken up into droplets of uniform size.and by energising the charging electrode 15 and thedeflecting electrodes 17. - With the
motor 31 energised, ink at an initial pressure of 1 p.s.i. is supplied from the outlet of thepump 27 to the inlet to thepump 29 via thepressure relief valve 41, the bleed line 49 and thebleed control orifice 51. This supply of ink seals internal clearances within thepump 29. Accordingly, the efficiency of thepump 29 as an air pump is increased, a higher suction is applied to thegutter 19, and a mixture of air and unused liquid is drawn from the gutter. As described above, theorifice 51 is pre-set to allow a predetermined flow of ink along the bleed line 49, this predetermined flow being sufficient to ensure that thepump 29 is adequately lubricated. - Once every 15 minutes during operation of the system, the microcomputer 69 initiates a check on the viscosity of ink in the system. As a first stage in the check, a signal from thë microcomputer 69 is applied to the
solenoid valve 57, causing the valve to open and to allow ink to flow from the bleed line 49 to theviscometer 55. Ink flows upwardly through thetube 59 of theviscometer 55, forcing thesteel ball 58 upwardly into the flaredportion 61 at the top of the tube. The ball remains in the flaredportion 61, supported by the upwards flow of ink, whilst ink continues to flow upwardly past the ball and then outwardly from thetube 59 to the reservoir 1. The presence of the flaredportion 61 means there is sufficient space for any solid particles in the ink to pass between the wall of thetube 59 and to return to the reservoir 1. - Approximately one minute after the
solenoid valve 57 has been opened, the microcomputer 69 activates thetimer 79 and at the same time applies a further signal to thevalve 57, causing the valve to close. With the upwards flow of ink terminated, theball 58 descends slowly within thetube 59 at a rate dependent upon the viscosity of ink in the tube. When theball 58 has moved downwardly through a predetermined distance, it enters theball detector coil 65. Movement of theball 58 through thecoil 65 is sensed by thesensor 73, which applies an input signal to the microcomputer 69. - Within the microcomputer 69, a computation of the viscosity of the ink is made from data representing the time between the closing of
solenoid valve 57 and the arrival of theball 58 at thecoil 65, data representing the ambient temperature or the temperature of the ink, supplied by thetemperature sensor 75 and the analoguedigital converter 77, and data stored in thememory device 71 and representing the relationship between the viscosity of the ink, the time taken for theball 58 to descend through thetube 59 and the ambient temperature. - A comparison is then made between the computed viscosity and data representing the optimum viscosity, also stored in the
memory device 71. - Assuming there is a difference between the computed and optimum viscosities, an output signal is applied from the microcomputer 69 to the
solenoid valve 67. Thevalve 67 is then opened for a predetermined interval of time and a predetermined volume of solvents flows from the make-upcartridge 23 to the line connecting thepump 29 to thegutter 19. - A similar computation of viscosity is made at intervals of 15 minutes. Each time there is a discrepancy between the computed and optimum viscosities, a fresh volume of solvents is supplied from the make-up
cartridge 23. If the computed viscosity equals the optimum viscosity, thesolenoid valve 67 remains closed so that no solvents are added. - One ink suitable for use in the ink jet printer of Figures 1 to 3 is known as "Coates Black MEK".
- As shown in Figure 4A, this ink has a viscosity which varies linearly with temperature between 200C and 450C, the viscosity falling from approximately 3.8 c.p. at a temperature of 200C to approximately 2.0 c.p. at 45°C. There is also a linear relationship between the viscosity of this ink and the time taken for the ball to fall through the predetermined distance within the
tube 59 of theviscometer 59, as shown in the graph forming Figure 4B. - Referring now to Figure 4C, the printer of Figures 1 to 3 was first operated over a period of 12 hours with the microcomputer 69 disconnected from the
solenoid valve 57. This meant that thevalve 57 remained closed so that there was no checking of the viscosity of ink in the system and no supply of fresh solvents from the make-upcartridge 23. As shown in Figure 4C, the viscosity increased at a fairly constant rate throughout the 12 hour period, starting at approximately 3.85 c.p.and ending at approximately 4.65 c.p. - Referring now to Figure 4D, the printer was then operated over a second 12 hour period with the microcomputer 69 re-connected to the
solenoid valve 57. Thevalve 57 was therefore opened and the viscosity checked in the manner described above. It will be seen from Figure 4D that the effect of periodically checking the viscosity and adding fresh solvent, when necessary, is to restrict variation in the viscosity and values between 3.9 and 4.0 c.p. - In a further printing operation carried out by the above printer the ambient temperature was 280C and the time for the ball to fall through the predetermined distance, assuming the viscosity was at its optimum value, was 72 sees. In practice, the measured time of descent was 74 sees. Accordingly, a charge of 8 ccs of solvent was added to the ink after the first check by the control means. This reduced the viscosity by 0.04 c.p. and reduced the ball descent time to 73 secs, as measured at the next check.
- In operation at normal running temperatures it was found that approximately 16 ccs out of a total volume of solvent of 1.75 litres were lost from the system during each hour. The control means described above compensate by adding the appropriate additional volumes of solvent.
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB838327999A GB8327999D0 (en) | 1983-10-19 | 1983-10-19 | Hydraulic systems |
GB8327999 | 1983-10-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0142265A1 true EP0142265A1 (en) | 1985-05-22 |
EP0142265B1 EP0142265B1 (en) | 1988-09-21 |
Family
ID=10550452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84306916A Expired EP0142265B1 (en) | 1983-10-19 | 1984-10-10 | Hydraulic systems for ink jet printers |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0142265B1 (en) |
DE (2) | DE142265T1 (en) |
GB (1) | GB8327999D0 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0282049A2 (en) * | 1987-03-13 | 1988-09-14 | Jan Slomianny | Ink system for an ink jet matrix printer |
EP0571785A2 (en) * | 1992-05-29 | 1993-12-01 | SCITEX DIGITAL PRINTING, INC. (a Massachusetts corp.) | Print head assembly |
EP2995462A1 (en) | 2014-09-04 | 2016-03-16 | Markem-Imaje Holding | A method for managing ink quality of an inkjet printer versus temperature |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3111987A1 (en) * | 1980-03-28 | 1982-01-07 | Sharp K.K., Osaka | Device for controlling the viscosity of the ink in an ink jet printer |
DE3125194A1 (en) * | 1980-06-30 | 1982-03-04 | Sharp K.K., Osaka | Inkjet printer |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4027516A (en) * | 1976-03-16 | 1977-06-07 | Gam Rad, Inc. | Viscometer system |
DE3031863A1 (en) * | 1980-08-23 | 1982-04-01 | Thöne, Ernst, 2000 Hamburg | METHOD AND DEVICE FOR DETERMINING THE VISCOSITY OF A LIQUID |
-
1983
- 1983-10-19 GB GB838327999A patent/GB8327999D0/en active Pending
-
1984
- 1984-10-10 DE DE1984306916 patent/DE142265T1/en active Pending
- 1984-10-10 DE DE8484306916T patent/DE3474124D1/en not_active Expired
- 1984-10-10 EP EP84306916A patent/EP0142265B1/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3111987A1 (en) * | 1980-03-28 | 1982-01-07 | Sharp K.K., Osaka | Device for controlling the viscosity of the ink in an ink jet printer |
DE3125194A1 (en) * | 1980-06-30 | 1982-03-04 | Sharp K.K., Osaka | Inkjet printer |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0282049A2 (en) * | 1987-03-13 | 1988-09-14 | Jan Slomianny | Ink system for an ink jet matrix printer |
EP0282049A3 (en) * | 1987-03-13 | 1989-08-16 | Jan Slomianny | Ink system for an ink jet matrix printer |
EP0571785A2 (en) * | 1992-05-29 | 1993-12-01 | SCITEX DIGITAL PRINTING, INC. (a Massachusetts corp.) | Print head assembly |
EP0571785A3 (en) * | 1992-05-29 | 1995-04-05 | Eastman Kodak Co | Four inch print head assembly. |
EP2995462A1 (en) | 2014-09-04 | 2016-03-16 | Markem-Imaje Holding | A method for managing ink quality of an inkjet printer versus temperature |
US10144216B2 (en) | 2014-09-04 | 2018-12-04 | Markem-Imaje Holding | Method for managing ink quality of an inkjet printer versus temperature |
Also Published As
Publication number | Publication date |
---|---|
EP0142265B1 (en) | 1988-09-21 |
DE3474124D1 (en) | 1988-10-27 |
GB8327999D0 (en) | 1983-11-23 |
DE142265T1 (en) | 1986-02-27 |
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AK | Designated contracting states |
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