Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
1997-08-25
2001-09-18
Barlow, John (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
Reexamination Certificate
active
06290324
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to inkjet printing mechanisms, and more particularly to a wet wiping system, including a method and an apparatus, for cleaning an inkjet printhead, such as may be used in inkjet printers, facsimile machines, plotters, scanners, and the like.
BACKGROUND OF THE INVENTION
Inkjet printing mechanisms use pens which shoot drops of liquid colorant, referred to generally herein as “ink,” onto a page. Each pen has a printhead formed with very small nozzles through which the ink drops are fired. To print an image, the printhead moves back and forth across the page shooting drops as it moves. Typically, a service station is mounted within the printer chassis to clean and protect the printhead. During operation, clogs in the printhead are periodically cleared by firing a number of drops of ink through each of the nozzles in a process known as “spitting.” The waste ink is collected in a reservoir portion of the service station, which is often referred to as a “spittoon.”
For storage, or during non-printing periods, the service stations usually include a capping system which humidically seals the printhead nozzles from contaminants and drying. After spitting, uncapping, or occasionally during printing, most service stations have an elastomeric wiper that wipes the printhead surface to remove ink residue, as well as any paper dust or other debris that have collected on the printhead. The wiping action is usually achieved by either moving the printhead across the wiper, or moving the wiper across the printhead. One known wiper uses an elastomeric wiper blade that has a backing layer of a felt-like material, which probably assists in draining away excess ink from the wiper tip.
To improve the clarity and contrast of the printed image, recent research has focused on improving the ink itself. For example, to provide faster, more waterfast printing with darker blacks and more vivid colors, pigment based inks have been developed. These pigment based inks have a higher solid content than the earlier dye based inks. Both types of ink dry quickly, which allows inkjet printing mechanisms to use plain paper. However, the combination of small nozzles and quick drying ink leaves the printheads susceptible to clogging, not only from dried ink and minute dust particles or paper fibers, but also from the solids within the new inks themselves. Partially or completely blocked nozzles can lead to either missing or misdirected drops on, the print media, either of which degrades the print quality.
Another characteristic of these new pigment based inks contributes to the nozzle clogging problem. The pigment based inks use a dispersant to keep the pigment particles from flocculating. Unfortunately, the dispersant tends to form a tough film on the printhead face as the ink vehicle evaporates. Besides the debris accumulated on the printhead face from ink over spray, paper crashes and servicing, this dispersant film also attracts paper dust and other contaminants. This film, as well as ink residue and debris surrounding the printhead nozzles, is quite difficult to remove from the printhead.
With the earlier dye based inks, wiper blades were typically used to clean the printhead face, such as wipers made of an elastomeric material, for instance a nitrile rubber, ethylene polypropylene diene monomer (EPDM) elastomer, or other types of rubber-like materials. Unfortunately, the tough film formed by the pigment dispersant was not easily removable by these elastomeric wipers. Instead, this residue tended to ball up and roll, in a manner similar to the way that the adhesive known as rubber cement balls up when dried.
Several wet wiping systems have been proposed that wet the printhead then wipe it while still wet. One type of system spits ink then immediately wipes the ink from the printhead. Another system spits ink on the wiper then wipes the printhead with the wet wiper. Both of these ink-wiping systems used an EPDM elastomeric wiper. Another type of system applies a solvent to the printhead. In this system, the solvent is supplied through a saturated applicator to the printhead using a capillary or wicking action. The solvent is then wiped from the printhead using an EPDM elastomeric wiper. This solvent based wiping system unfortunately adds complexity and cost to the overall product.
Thus, a need exists for an improved system for cleaning inkjet printheads, which is directed toward overcoming, and not susceptible to, the above limitations and disadvantages.
SUMMARY OF THE INVENTION
According to one aspect of the present invention, a method is provided of wiping an inkjet printhead in an inkjet printing mechanism. The method includes the step of admitting ink through a nozzle of the inkjet printhead. In a dissolving step, any accumulated ink residue adjacent the nozzle is dissolved with the admitted ink. In a wiping step, the admitted ink and any dissolved residue is wiped from the printhead.
In one illustrated embodiment, the method further includes the step of placing the printhead in contact with a wicking pad. The admitting step comprises the step of extracting ink from the printhead through capillary action induced by the wicking pad. In another illustrated embodiment, the admitting step comprises ejecting ink by firing the printhead with a low thermal turn-on energy level that is lower than a normal thermal turn-on energy level used for printing. Firing at this low thermal turn-on energy level allows ink droplets to accumulate around the nozzle to act as a solvent used in the dissolving step.
According to another aspect of the present invention, a wet wiping system is provided for wiping an inkjet printhead used in an inkjet printing mechanism. The system includes a service station mounted to a chassis of the printing mechanism. The system also includes a wiper supported by the service station to selectively contact and wipe the printhead. The wiper comprises a wiping member of a plastic material and a resilient support member mounted to the service station adjacent the wiping member. In an alternate embodiment, a wet wiping system includes a service station mounted to a chassis of the printing mechanism and a wicking pad of an absorbent material supported by the service station to selectively contact the printhead and extract ink from the printhead through capillary action.
According to yet another aspect of the present invention, an inkjet printing mechanism is provided with one of these wet wiping systems.
An overall object of the present invention is to provide an inkjet printhead wet wiping apparatus and method for maintaining a high quality of printing with pigment based inks.
Another object of the present invention is to provide an effective wet wiping system which is low in cost and easy to manufacture, so as to provide an economical, compact and high quality inkjet printing mechanism.
REFERENCES:
patent: 4859527 (1989-08-01), DiStefano
patent: 5489927 (1996-02-01), Harmon
patent: 5706038 (1998-01-01), Jackson et al.
Jackson Kedrich J.
Purwins Thomas J.
Barlow John
Hallacher Craig A.
Hewlett--Packard Company
Martin Flory L.
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