Replaceable cartridge, kit and method for flushing ink from an inkjet printer

Abstract: A replaceable reservoir cartridge (14) is provided for use in an inkjet apparatus (1), wherein a reservoir cartridge (24) with a first ink has been installed and which is to be replaced by a reservoir cartridge (14) including a second ink. The replaceable reservoir cartridge (14) includes a supply of fluid (22) for flushing the first ink from the pathways in the inkjet apparatus (1). A memory (20) is carried by the replaceable reservoir cartridge (14) and couples to a processor (40) within the inkjet apparatus (1) when the replaceable reservoir cartridge (14) is installed. The memory (20)includes parameters, which, upon being accessed and utilized by a procedure stored in the processor (40), causes a printing of a plurality of disposable media sheets to enable a flushing of the first ink from pathways in the inkjet apparatus (1). The replaceable reservoir cartridge (14) may be incorporated into a kit which further includes a storage media (i.e., a diskette (12)) with a procedure for controlling the inkjet apparatus (1) to enable operation of the flushing action. The kit may also include a printhead (30) which includes resident memory (34) that includes a parameter which defines an amount of the fluid in the replaceable reservoir cartridge (14) to be used for flushing purposes, that parameter being less than would otherwise be required if the printhead (30) was not being replaced.

Description: FIELD OF THE INVENTION This invention relates to inkjet printers and, more particularly, to apparatus for flushing ink from elements of an inkjet printer. BACKGROUND OF THE INVENTION Substantially all present-day copiers, printers, plotters, etc., require entry of usage, calibration and other data. In regards to ink jet printers, it has been proposed that printheads incorporate a parameter memory for storage of operating parameters to be used by the printer for calibration purposes. Such parameters include: drop generator driver frequency, ink pressure and drop charging values (see "Storage of Operating Parameters in Memory Integral with Print Head", Lonis, Xerox Disclosure Journal, Volume 8, No. 6, November/December 1983, page 503). U. S. Patent 5,138,344 to Ujita, entitled "Ink Jet Apparatus and Ink Jet Cartridge Therefor", indicates that an ink-containing replaceable cartridge can be provided with an integral information device (i.e., a resistor element, magnetic medium, bar code, integrated circuit or ROM), for storage of information relating to control parameters for an ink jet printer. U. S. Patent 5,365,312 to Hillmann et al., entitled "Arrangement for Printer Equipment Monitoring Reservoirs that Contain Printing Medium", describes the use of memory devices with integral ink reservoirs for storage of ink consumption data (for use by a coupled ink jet printer). European patent EP 0 720 916, entitled "Ink Supply Identification System for a Printer" describes the use of an ink supply having an integral EEPROM which is utilized to store data regarding the identity of the ink supply and its fill level. The prior art further teaches the use of consumable parts with integral memory for use in electrophotographic printers. In U. S. Patent 5,021,828 to Yamaguchi et al., entitled "Copying Apparatus having a Consumable Part", a toner cartridge is disclosed which includes a memory for storing data regarding to the state of consumption of toner in the cartridge. U. S. Patents 4,961,088 to Gilliland et al.; 4,803,521 to Honda; 5,184,181 to Kurando et al.; and 5,272,503 to LeSueur et al. all describe various replaceable toner cartridges for use in electrophotographic printers. Each cartridge incorporates a memory device for storing parameter data regarding the cartridge. Ink compositions used in ink jet printers are constantly being improved. In the course of such improvements, however, new ink compositions may be found to be incompatible with previous ink compositions. For instance, a new ink composition may combine with the old ink composition to form a precipitate, causing tubing and/or the printhead to clog. Further, when installing an ink cartridge with a new ink composition, if the old ink is still present in the tubing and printhead of the printer, the properties of the ejected ink will be altered. This can be an especially severe problem when a different colored ink is substituted for a previously used ink. Thus, until the old ink is purged, the print quality will suffer. In general, any time a new ink is to be used in place of a non-identical ink, a potential incompatibility issue is presented (e.g., different colors, densities, solvents, pigments, surfactants, etc..) Accordingly, it would be desirable to provide a kit for use with an ink jet apparatus, which kit includes an ink cartridge including a fluid that is usable, at least in part, to flush a previous ink type from components of the apparatus. It would further be desirable to provide a replaceable ink cartridge that is usable to flush ink from an inkjet printer, wherein the cartridge includes integral memory means which cooperates with the inkjet printer to enable operation of the flush action. SUMMARY OF THE INVENTION In accordance with the present invention there is provided a kit for use with an inkjet apparatus as defined in claim 1. The kit may also include a printhead which includes resident memory that includes a parameter which defines an amount of the fluid in the replaceable reservoir cartridge to be used for flushing purposes, that parameter being less than would otherwise be required if the printhead was not being replaced. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of an inkjet printer (with cover removed) which incorporates the invention. Fig. 2 is a block diagram of the inkjet printer of Fig. 1, showing replaceable elements therefor, including a flush cartridge, an ink cartridge and a printhead. Fig. 3 is a block diagram showing connection of the components within the inkjet printer of Fig. 1. DETAILED DESCRIPTION OF THE INVENTION Fig. 1 illustrates a perspective view of an inkjet printer 1 which incorporates the invention. A tray 2 holds a supply of input paper or other print media. When a printing operation is initiated, a sheet of paper is fed into printer 1 and is then brought around in a U-direction towards an output tray 3. The sheet is stopped in a print zone 4 and a scanning cartridge 5, containing plural removable color printheads 6 is scanned across the sheet for printing a swath of ink thereon. The process repeats until the entire sheet has been printed, at which point it is ejected onto output tray 3. Printheads 6 are, respectively, fluidically coupled to four removable ink cartridges 7 holding, for example, cyan, magenta, yellow and black inks, respectively. Since black ink tends to be depleted most rapidly, the black ink cartridge has a larger capacity than the other ink cartridges. As will be understood from the description which follows, each printhead and ink cartridge is provided with an integral memory device which stores data that is used by printer 1 to control its printing operations. In Fig. 2, a host processor 10 connects to inkjet printer 1 and provides both control and data signals therefor. Host processor 10 is adapted, in the known manner, to receive a memory media cassette 12 which includes an operating program for controlling a flush action within inkjet printer 1. As indicated above, inkjet printer 1 is capable of receiving a plurality of pluggable ink cartridges containing one or more colors for use by the printhead. To accomplish a flush action, a first embodiment of the invention employs a flush cartridge 14 which is configured identically to normal replacement ink cartridge 24. Flush cartridge 14 includes a reservoir 15 including a supply of flush fluid, a fluidic coupler 16 and an electrical connector 18, both of which couple to mating connectors within inkjet printer 1 upon installation of flush cartridge 14. A memory chip 20, installed on flush cartridge 14, is coupled to connector 18 and contains parameters that are used by inkjet printer 1 to control the flush action. Electrical connector 18 also makes connection with other elements within flush cartridge 14 which serve to monitor the level of a flush fluid within reservoir 15. The fluid within reservoir 15 of flush cartridge 14 is preferably a supply of the liquid vehicle (i.e., a solvent) to be utilized with the new ink. The ink vehicle will not includes pigment so as to avoid any interaction between the old and new pigment materials. It is to be understood, however, that the fluid within flush cartridge 14 can be any fluid which performs the desired action of flushing old ink from the ink pathways within printer 1. Ink cartridge 24 is identical in structure to flush cartridge 14, however, its reservoir 26 includes a replacement ink supply for inkjet printer 1. Memory 28 includes parameters which are specifically derived for use with the replacement ink and by inkjet printer 1 for control of its print action when employing the replacement ink. A printhead 30 also includes a fluidic coupler region 32, a resident memory 34 and an electrical connector 36 which makes connection to memory 34, as well as other sense and control devices within printhead 30. Fig. 3 illustrates interconnections between a microprocessor 40, which controls the operation of inkjet printer 1, flush cartridge 14 and printhead 30. An ink flow path 42 provides a flow path between flush cartridge 14 and printhead 30. As above indicated, flush cartridge 14 is used when there is need to flush old ink from ink flow path 42 and printhead 30 to enable a new ink supply to be utilized. To commence the flush action, the user loads diskette 12, containing a flush control procedure, into microprocessor 10 and enters a command, such as "new ink". Host processor 10 then begins execution of the flush procedure. Computer screen 44 prompts the user to remove and discard the old ink cartridge and to replace it with flush cartridge 14 and then to click on a screen button. Thereafter, the host processor 10 asks the user to put "scratch paper" in the printer's paper tray and to again click on a screen button. At such time, printer 1 commences printing a number of pages, using the ink vehicle contained within flush cartridge 14. This action enables sufficient printing to occur to completely flush the old ink from ink flow path 42 and printhead 30. Printer 1 is preferably controlled to print at 100% density area fill which acts to purge the old ink and to replace it with the ink carrier. Thereafter, at the finish of the print action, screen 44 prompts the user to remove flush cartridge 14 and to replace it with ink cartridge 24 (Fig. 1) containing a new ink supply. When the replacement action had been completed, the user is instructed to click on a screen button and printer 1 commences printing a number of pages to remove the ink carrier from ink flow path 42 and printhead 30. Thereafter, printer 1 is ready to handle print jobs in the normal manner. If the user accidentally installs a new ink cartridge 24 prior to installing flush cartridge 14, host processor 10 alerts the user to the fact that the ink in cartridge 24 is an incompatible variety. Host processor 10 then instructs the user to remove ink cartridge 24 and to install flush cartridge 14. Host processor 10 inhibits further printing with new ink cartridge 24 until a flush procedure is run. As can be seen, a significant advantage from having memory elements on cartridges 14 and 24 is to prevent damage to the ink delivery system of printer 10 which might occur if an attempt is made to use two inks that are mutually precipitating or have another compatibility problem. A further advantage is that the flush control procedure can be set up to provide the user with status data regarding the progress of the flush operation Memory 20 on flush cartridge 14 contains parameters which enable microprocessor 40 (i) to identify the fact that flush cartridge 14 is the appropriate cartridge to perform a flush action; and (ii) to access a parameter which identifies the number of pages to be printed so as to enable a complete flushing of ink flow path 42 and printhead 30. So long as printhead 30 is not replaced after the flush action, the parameter, indicating the number of pages that is stored in memory 20, controls the operation of microprocessor 40. If, however, printhead 30 is replaced after the flush action, its memory 34 includes a parameter indicating a lesser number of pages to be printed than the number of pages indicated by the parameter in memory 20. This is due to the fact that there is no resident ink in printhead 30 to be flushed. Thus, if a new printhead 30 is installed, and the user indicates such action by clicking on a screen button, the parameter from memory 34 regarding number of pages to be printed during the flush action is utilized in lieu of the parameter from memory 20. The above description has assumed an incompatibility between the new ink and the old ink still resident in ink flow path 42 and printhead 30. If the new and old inks are compatible (e.g., will mix without doing damage to the printer), then flush cartridge 14 may simply be a cartridge containing the new ink. In such case, the flush procedure is still executed, however, it is the new ink which is utilized to flush ink flow path 42 and printhead 30. When an ink cartridge is installed that has a fluid or ink composition that is different from that currently present in the printer, the user receives a warning. In the preferred embodiment, the user is given the option of removing an cartridge containing the new ink or going through with a flush action. The cartridge (and its memory element) thus form a critical element of a checking system that prevents the user from accidentally damaging the printer or producing a print job whose quality is degraded. It is preferred that flush cartridge 14 and diskette 12 be configured as a kit. The kit may also include a replacement printhead 30, if such is needed. As can be seen from the above, the use of a flush cartridge and a flush action removes incompatibility issues when marketing improved ink compositions. Further, after the flush action, the printer is ready for normal print actions using the new ink composition, as the old ink has been completely removed from the system. The on-screen guidance provided by host processor 10, in response to the program contained on diskette 12, when combined with flush cartridge 14 and, possibly, printhead 30, enables an ink change-over process to readily be accomplished by the user.

Claims: A kit for use with an inkjet apparatus (1) in which a reservoir cartridge (24) containing a first ink has been installed and which is to receive a replacement reservoir cartridge (14) containing a second ink, said kit comprising: a storage medium (12) on which is stored a procedure for controlling a said inkjet apparatus (1) upon installation of a said replaceable reservoir cartridge (14) therein; and a replaceable reservoir cartridge (14) comprising: a supply of fluid (22) for flushing a said first ink from pathways in a said inkjet apparatus (1); and memory means (20) in which is stored data for reading by a processor means (40) in a said inkjet apparatus (1) upon installation of a replaceable reservoir cartridge (14) therein; the arrangement being such that, upon said data stored in said memory means (20) being so read, said procedure provides a notice to a user enabling the user to cause said inkjet apparatus (1) to print a plurality of medium sheets using said fluid (22) to flush said first ink from said pathways. A kit as claimed in claim 1, wherein said fluid (22) comprises a said second ink. A kit as claimed in claim 2, wherein said procedure is arranged to determine whether said second ink is compatible with said first ink. A kit as claimed in claim 3, wherein said procedure is arranged, in the event of a positive determination, to enable a user to cause said inkjet apparatus to print a plurality of medium sheets using said second ink to flush said first ink from said pathways. A kit as claimed in claim 3 or claim 4, wherein said procedure is arranged, in the event of a negative determination, to alert the user accordingly. A kit as claimed in claim 1, wherein said fluid (22) comprises an ink solvent not containing any pigment therein. A kit as claimed in claim 6, wherein said procedure is arranged to alert a user in the event that that a replaceable reservoir cartridge (14) containing ink which is incompatible with the first ink has been installed prior to installing a replaceable reservoir cartridge (14) containing said solvent. A kit as claimed in claim 6 or claim 7, wherein said procedure is arranged, after installation of a replaceable reservoir cartridge (14) containing a said second ink, to cause said inkjet apparatus to print a plurality of medium sheets using said second ink to flush said solvent from said pathways. A kit as claimed in any preceding claim, further comprising: a printhead (30) for printing with said second ink; and printhead memory means (34) for coupling to a said processor means (40) in a said inkjet apparatus (1) upon installation of said printhead (30) therein, said printhead memory means (34) having stored therein data defining an amount of said fluid to be utilized to flush said first ink from said pathways, the procedure being arranged to cause said data to override previous data from said memory means (20) on said replaceable reservoir cartridge (14), thereby to cause the printing of a lesser plurality of medium sheets to enable a flushing of said first ink from said pathways.

Inventors: CHILDERS WINTHROP D, PAWLOWSKI NORMAN E JR, CHILDERS, WINTHROP D., PAWLOWSKI, NORMAN E., JR.
Applicants: HEWLETT PACKARD CO, HEWLETT-PACKARD COMPANY
Application year: 1997
Main classification: B41J2
IPC codes: B41J2