1. Technical Field
The invention relates to the field of inkjet printing. More specifically, the invention relates to liquid ink delivery for large throughput printing applications.
2. Description of the Related Art
Inkjet printing involves depositing droplets of liquid ink onto a printing medium from one or more printer heads. The printer heads are coupled with a container containing ink. Ink is ejected from one or more nozzles of the print heads when a piezoelectric crystal in the print head is actuated. The piezoelectric crystal generates a pulse in the ink so that the ink expels through the nozzle as a droplet. To create the image, a carriage which holds one or more print heads scans or traverses across the printing medium, while the print heads deposit ink as the printing medium moves.
Small desktop inkjet printers are common consumer electronic products. Indeed, many consumer and business printing needs may be met by small desktop inkjet printing systems because of the relatively small amount of ink needed for common print jobs. However, some printing applications require much larger amounts of ink. For instance, large format printing is performed to create signs, banners, museum displays, sails, bus boards and the like. These types of applications require large throughput printers and require a much larger quantity of ink.
Ink cartridges are typically sold with replaceable ink reservoirs. Ink reservoirs are typically individually packaged and sold over the counter. However, common inkjet reservoirs contain far less ink than is required for large format printing. Currently, replacement reservoirs are not available in volumes greater than approximately five liters. Furthermore, the overhead cost associated with individually manufacturing, packaging and shipping small, individual replacement reservoirs is burdensome given that they must be replaced frequently to achieve large format printing.
Additionally, the ink used for inkjet printing is very expensive. This encourages designing printing systems that waste little ink. Some common containers for large format printing are designed to collapse in order to force the ink out of the cartridges and waste as little ink as possible. However, collapsible containers must be packaged in a protective shell or secondary container to protect the integrity of the container during shipping and handling. The secondary container adds to the overall cost of replacement ink.
In view of the foregoing, the invention provides a large liquid ink container and an ink delivery system for using the same.
In some embodiments of the invention, the liquid ink container is a large, substantially rigid receptacle designed for large format printing applications, wherein the receptacle does not need a secondary container to protect it during shipping. In some embodiments of the invention, the liquid ink container is substantially opaque.
In some embodiments of the invention, an ink delivery system is used to accept the large liquid ink container and designed to support the container at an angle, such that liquid ink flows from the container due to the force of gravity. In some embodiments, the ink delivery system includes protrusions disposed on the support surface. The protrusions are especially designed to mate with notches on the liquid ink container, such that the container self-aligns with the delivery system.
In some embodiments, an identification tag is disposed on the liquid ink container to provide information to a user regarding the contents therein. According to these some embodiments, the ink delivery system includes an identification tag reader, a processor, computer implemented instructions stored in a memory, and a user interface. Using these components, a user can view the content data.
In some embodiments, the ink delivery system includes a receiver configured to mate with the cap of the liquid ink container. According to these embodiments, a metal ring disposed within the receiver actuates, stamping a hole in the cap, thus initiating fluid ink flow. The self aligning features described above work synergistically with the cap puncturing means.
In some embodiments of the invention, the receiver includes a gas port and the cap includes a gas fitting. The gas port and gas fitting are aligned in fluid communication with one another when the receiver and the cap are coupled. The receiver also includes a nozzle for the introduction of forced gas. According to these embodiments, forced air traverses the receiver and the cap and is introduced into the liquid ink container. The forced gas helps facilitate evacuation of the liquid ink from the container.
In some embodiments of the invention, the ink delivery system includes a processor and computer implemented instructions stored on a memory device that automates fluid flow upon coupling the liquid ink container with the ink delivery system. The gas port, the gas fitting, the actuating metal ring, the processor and the self-aligning features offer a user-friendly ink delivery method.
The liquid ink container 100 is configured with side notches 125, 126 and a cap 150. The side notches 125, 126 define angled surfaces 127, 128. In some embodiments, the liquid ink container is emptied into an ink delivery system (shown below) having a support surface and one or more support protrusions. The angled surfaces 127, 128 support the liquid ink container 100 at a downward angle when interfaced with appropriate extrusions on a support surface of an ink delivery station (explained below). When so positioned, the liquid ink container 100 empties due to the force of gravity on the ink contained therein. In some embodiments of the invention, the delivery of ink is automated and accomplished without manual interaction beyond placing the liquid ink container 100 in an inverted position within the ink delivery system.
In some embodiments, the cap 150 is designed to be punctured for allowing liquid ink to flow while the liquid ink container 100 is in the downward angle position. According to these embodiments, the cap 150 can be positioned on the very edge of the liquid ink container 100 such that when the liquid ink container 100 is emptied, ink does not pool up within the liquid ink container 100.
In some embodiments of the invention, the liquid ink container 100 is substantially rigid. In these embodiments an additional shipping container may not be needed to protect the contents.
As explained above, common ink containers found in prior art must be collapsible in order to fully evacuate the ink therein. However, using a substantially rigid material discourages a collapsing system. Therefore, according to some of these embodiments, the liquid ink container 100 is configured with a gas fitting (explained below) for introduction of pressurized gas into the liquid ink container 100 to assist in the evacuation of the liquid ink contained therein. In some embodiments, the gas fitting is disposed in the cap 150. The rigidity of the liquid ink container 100 is made possible by the disclosed method and corresponding apparatus for effective evacuation of ink from the liquid ink container 100 using forced gas (explained below).
The liquid ink container 100 also includes stacking lugs 131, 132 comprising protrusions from the top surface of the liquid ink container 100 and corresponding stacking recesses (explained below) in the bottom surface of the liquid ink container 100. Accordingly, liquid ink containers 100 can stack upon one another, thus facilitating efficient storage and shipping.
In some embodiments of the invention, a swing handle 140 is coupled to the top surface of the liquid ink container 100.
In some embodiments of the invention the liquid ink container 100 is especially designed for large ink volume applications, such as fast throughput printing applications. In some embodiments, the liquid ink container 100 holds approximately twenty liters of liquid ink. According to some embodiments, the liquid ink container has the approximate dimensions of sixteen and one sixth inches by nine and three quarters inches by eleven and one quarter inches.
In some embodiments of the present invention, the liquid ink container 100 includes an identification tag 180. The identification tag 180 contains information relating to the contents of the liquid ink container 100. For example, in some embodiments, the identification tag 180 includes information relating to the color of ink, the date the ink was manufactured, the name of the manufacturer of the ink, the quantity of ink, the expiration date of the ink, or combinations of these data.
In some embodiments of the invention, the identification tag 180 comprises a radio frequency identification (RFID) tag. According to these embodiments, the RFID tag contains encrypted data relating to the ink contained within the liquid ink container 100. Operation of a RFID tag is described in greater detail in the commonly-assigned U.S. Pat. No. 7,431,436, which issued on Oct. 7, 2008, the entire contents of which are incorporated herein by reference.
In some embodiments of the invention, a liquid ink container and an ink delivery station are used together to produce synergistic results.
In some embodiments, the notches, e.g. 125, 126, and the support surfaces of the liquid ink container, e.g. 100, securely accommodate the support protrusions 297, thereby self-aligning the liquid ink container 100, within the ink delivery station 299. In some embodiments, the notches, the support surfaces of the liquid ink container 100 and the support protrusions 297 secure the liquid ink container 100 at an approximately twenty degree angle from the horizon while positioned in a level ink delivery station 299.
The receiver 250 allows liquid ink to flow therethrough. In some embodiments of the invention, the receiver 250 punctures the cap 150 of the liquid ink container 200, allowing the flow of liquid ink. In some embodiments of the invention, the receiver 250 contains a ring (
In some embodiments, the receiver 250 is configured with a nozzle 260 for the introduction of pressurized gas. In some embodiments of the invention, the cap of the liquid ink container 200 is configured with a gas port (shown below) to facilitate the introduction of pressurized gas from the receiver into the liquid ink container 200, for assisting the evacuation of the ink contained therein.
The liquid ink delivery system 299 also includes ink delivery lines 240 that couple with a printing station (not shown). In some embodiments of the invention, the liquid ink delivery system 299 couples with a dedicated printing station. In other embodiments, the liquid ink delivery station 299 is modular and compatible with wide variety of printing stations.
In some embodiments of the invention, the ink delivery station 299 also includes a processing unit 270 and a user interface 279.
In some embodiments, output 274 comprises a metal ring actuator and output 275 comprises a nozzle actuator. In some other embodiments, the outputs 274, 275 and/or 276 comprise a pump for the introduction of forced air or an ink pump to deliver ink to the print station. According to these embodiments, the processing unit 270 can initiate the flow of liquid ink from the liquid ink container. In some embodiments, output 276 is the user interface 279.
In some embodiments, the RFID reader 277 is positioned within the processing unit 270 of the ink delivery system 299, such that it can read an RFID tag on the liquid ink container 200. According to these embodiments, the processor 271 interprets information obtained from the RFID reader 277, and displays it on the user interface 279.
In some embodiments, additional inputs are used for displaying additional information on the user interface 279.
The ink level display 278 communicates with, and is responsive to a float mechanism contained within the liquid ink container 200. In some embodiments, the float mechanism has a discrete number of incremental sensors for determining the ink level at various different points in the vertical dimension inside the liquid ink container 200. The float mechanism sends a signal through the processor 271, and to the ink level display 278 on the user interface 279, which lights up one or more indicators from the bank of indicators 999. In some embodiments, one or more of the indicators within the bank of indicators 999 are colored differently from one or more other indicators.
In some embodiments of the invention, the metal ring 340 is actuated by an electric actuator (not shown) coupled to the receiver 350. Although electric actuation is explicitly disclosed, it will be readily apparent to those with ordinary skill in the relevant art having the benefit of this disclosure that a wide variety of other actuation devices (e.g. pneumatic actuation) are similarly applicable for actuating the metal ring 340.
As explained above, it is common to use small, collapsible ink containers in printing applications. To ensure that little ink is wasted, the small ink containers are collapsed to consolidate ink in the gradually smaller volume of the container. This method is generally acceptable in small liquid ink container applications.
However, in high throughput printing applications, it is desirable to use large volume, substantially rigid liquid ink containers. Large volume containers provide more ink, thereby reducing the frequency of changing containers. Rigidity is desirable because it enables the containers to be shipped without additional packaging. However, substantially rigid liquid ink containers are not easily collapsible. Therefore, it would be desirable to ensure substantial evacuation of liquid from large, substantially rigid liquid ink containers, thereby limiting wasted ink. According to some embodiments of the invention, the liquid ink container is set at an angle, to facilitate gravity induced fluid flow. Additionally, gas is forced into the container, to further force the liquid ink out of the container, by the additional force of the gas on the remaining ink.
Forced gas is introduced to the receiver 450 through a nozzle 430. The forced air traverses the body 400 via an internal conduit (not shown), and exits the receiver 450 via the pressurized gas port 411. When coupled, the pressurized gas port 411 aligns with a gas fitting 460 coupled to the puncture cap 451. In some embodiments, the gas fitting 460 contains a check valve (not shown) to allow gas to flow into the liquid ink container, e.g. 100, but to prevent gas from flowing out of the liquid ink container 100 through the gas fitting 460.
The puncture cap 451 is configured with a substantially hermetic conduit 475. The conduit 475 is open on the inner side of the puncture cap 451 and sealed on the outer side of the puncture cap 451. As explained above, the receiver 450 contains a metal ring 440 that is actuated. When the puncture cap 451 and the receiver 450 are coupled, the metal ring 440 aligns with the conduit 475. When the metal ring 440 is actuated, it extends through the first terminal end 410, into the conduit 475 of the puncture cap 451, and stamps a hole in the sealed end of the conduit 475. After actuation, liquid ink can freely flow from the liquid ink container, e.g. 100, through the puncture cap 451, through the receiver 450 and into delivery lines 240 (not shown).
As such, when the puncture cap 451 and the receiver 450 are coupled, forced gas from the nozzle 430 traverses the receiver 450 via an internal conduit (not shown), passes through the pressurized gas port 411, enters the gas fitting 460 and flows into the conduit 475. When the puncture cap 451 is coupled with a liquid ink container, e.g. 100, forced gas enters the liquid ink container 100 via the conduit 475, and helps evacuate liquid ink from the liquid ink container 100.
In some embodiments of the invention, a liquid ink delivery station 299 and a liquid ink container, e.g. 100, are designed with mating features for self-alignment. In the forced air evacuation systems, such as those described in
Referring again to
Likewise, the puncture cap 550 mates with, and partially extends into, the conduit 596. According to these embodiments, only a liquid ink container 500 with appropriate sized side notches 525, 526 will couple with the support surface 580. Additionally, according to these embodiments, a force exerted to the puncture cap 550 will prevent the liquid ink container 500 from becoming decoupled from the support surface 580.
As explained above, liquid ink containers using forced gas evacuation systems will benefit from the mating and self-alignment features. Particularly, self-alignment offers ease of user operation. The user simply places the liquid ink container 500 into the support surface 580 in order to ensure proper alignment of the puncture cap 550. Accordingly, the user need not worry about further aligning the actuating metal ring 340, 440 of the receiver, e.g. 250, 350, 450 and the puncture cap 550, or aligning the pressurized gas port, e.g. 311 (
In some embodiments of the invention, the delivery station 299 includes a computer processor, e.g. 271 (
In some embodiments, the liquid ink container, e.g. 100, 200, 500, and liquid ink delivery station 299 include mating features, and the method for delivering liquid ink 600 is automated. According to these embodiments, a user effects step 610 by manually placing a liquid ink container 100, 200, 500 into the liquid ink delivery station 299. Next, the user interfaces with the delivery station 299 via a user interface 279. The remainder of the method 600 is automated by the processor 271, the electromechanically coupled actuator 274, and means for introducing pressurized gas into the receiver 250, 350, 450.
As will be understood by those familiar with the art, the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Likewise, the particular naming and division of the members, features, attributes, and other aspects are not mandatory or significant, and the mechanisms that implement the invention or its features may have different names, divisions and/or formats. Accordingly, the disclosure of the invention is intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following Claims.
This application is a Divisional of U.S. application Ser. No. 12/424,279, entitled Liquid Ink Container and Delivery Station, filed 15 Apr. 2009, which is incorporated herein in its entirety by this reference thereto. This application is also related to PCT Application No. PCT/US10/31267, entitled Liquid Ink Container and Delivery Station, filed 15 Apr. 2010, which claims the benefit of U.S. application Ser. No. 12/424,279, entitled Liquid Ink Container and Delivery Station, filed 15 Apr. 2009. The applicants hereby rescind any disclaimer of claim scope in the parent application or the prosecution history thereof and advises the USPTO that the claims in this application may be broader than any claim in the parent application.
Number | Date | Country | |
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Parent | 12424279 | Apr 2009 | US |
Child | 13692917 | US |