# Patent

## Title
Ink cartridge with multiple chambers aligned along an axial length

## Abstract

An ink cartridge has a first portion having a plurality of chambers formed therein; a second portion attached to the first portion and having at least one opening into each of the plurality of chambers, and wherein for each opening the second portion further includes at least a portion of a fluid directing channel; and a third portion attached to the second portion and configured to receive a plurality of fluids and direct each of the plurality of fluids into one of the respective fluid directing channels such that each of the plurality of fluids flows into a respective one of the plurality of chambers.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This is a continuation of application Ser. No. 11/039,879 filed Jan. 24, 2005, now U.S. Pat. No. 7,278,720. Priority is claimed under 35 U.S.C. §120.


BACKGROUND
The present invention relates to a multiple-chambered inkjet cartridge and more specifically to an arrangement which enables the transport and regulation of multiple different and separate inks, from an inkjet printer, to separate chambers in the ink cartridge.
In prior arrangements, ink is stored in the cartridge in different chambers. However, these arrangements are such that the different chambers in the printer cartridge are not configured to support refill.
Prior solutions have found ways to transport and regulate one ink to a single chambered body. However, numerous intricacies exist in creating a printer cartridge that can transport and regulate multiple inks to a multiple chambered body.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of an embodiment of the invention in the form of an exemplary ink cartridge.
FIG. 2 is a perspective view showing an exemplary manner in which chambers are arranged in tandem in the body of the ink cartridge shown in FIG. 1.
FIG. 3 is a perspective view of the shrouds and ink induction needles that are formed at one end of a crown member of the ink cartridge depicted in FIG. 1.
FIG. 4 is a perspective view of an upper side of an internal crown of the ink cartridge shown in FIG. 1 before the cap is disposed thereon.
FIG. 5 is a top view showing the upper side of the crown of the ink cartridge shown in FIG. 1.
FIG. 6A is a perspective view of the underside of the crown member showing the provision of separate pairs of regulator members which control the supply of ink into the separate chambers of the ink cartridge.
FIG. 6B is an enlarged view of the arrangement shown in FIG. 6A showing the provision of a bladder between a pair regulator members and a spring which biases the pair of regulator members toward one and other.
FIG. 7 is a perspective view of an exemplary valve seat which cooperates with a valve member carried on a pair of regulator members to permit passage of ink into a chamber of the ink cartridge.
FIG. 8 is a perspective view showing the disposition of the two valve seats in a lower face of the crown along with over-molded rubber gaskets which seal the ink in respective chambers of the ink cartridge.
FIG. 9 is a perspective close-up view showing details of the side walls which form part of ink transfer channels formed on the upper face of the crown.
FIG. 10 is a perspective view showing details of an ink channel structure having a fitment that permits air to enter while preventing ink from escaping, and a leak test port which can be permanently sealed after successful testing for leaks.



DETAILED DESCRIPTION
An exemplary embodiment of the invention has a dual-shroud or cap which is snapped into a dual-channel crown, that sits on a dual-chambered pen body. The shroud and crown deliver two different inks from the inkjet printer to the chambers in the pen body. Inks flow into the shroud, through separate channels in the crown, and to their respective chambers in the body of the pen under regulation by the dual/tandem regulators.
This dual-chambered inkjet cartridge permits a plurality of inks to be dispensed on paper at a lower cost. For example, one cartridge can be used to dispense two or more inks or other fluids, reducing cost and/or permitting more inks to be used in the same space in a printer. Separate ink from the cartridge allows automatic refill of ink into the cartridge. Thus, the printer can run for longer intervals with larger ink supplies before running out, and when ink does run out, only the ink container needs to be replaced, not the entire cartridge. Previously, self-refillable cartridges only contained one ink.
Some of the features of the exemplary embodiments shown herein include, for example, on-axis/on-carriage regulation of two or more inks, regulation of two or more inks using internal regulator assemblies in separate chambers within the pen, transportation of two or more inks from a printer or other like printing device, through a fluid-interconnect system, to the chambers within the pen, and a system for delivering multiple off-axis/off-carriage ink supplies to one print head (e.g. one silicon die).
FIG. 1 shows an exemplary embodiment of an ink cartridge 100 which includes multi-chambered pen body 101, a crown 102 which sits on the pen body 101 in a manner which closes the open mouths of the chambers (see FIG. 2). The ink cartridge 100 further includes a shroud 104 which, in this example, is integral with the crown 102 and disposed at one end thereof. A cap or lid 106 is attached on the upper surface of the crown.
The shroud 104, as shown in FIG. 3, is such as to surround and enclose two elongate hollow members or needles 104A which are configured to fit into the open ends of interconnecting tubes or conduits (not shown) so as to enable ink to be received from a printer (not shown) associated with the cartridge 100. In this embodiment, the shroud 104 is formed separately from the crown 102 and then connected thereto. By way of example, shroud 104 is formed with a T-shaped slot 104S which is configured to receive a T-shaped guide member 101B which is integral with the pen body 101.
The needles 104A are arranged to fluidly communicate with a first set of ink transfer ports 102A1 and 102A2 which are formed in one end of the crown 102 as best seen in FIG. 4. These ports 102A1 and 102A2 respectively communicate with first and second ink transfer channels 102TC1 and 102TC2. As shown in this figure, channel 102TC1 is longer than 102TC2 and extends to an ink transfer port 102IN1 which is located proximate an end of the crown that is distal from the end to which the shroud 104 is connected. Ink transfer port 102IN1 is configured to communicate with the first ink chamber 101C1 (FIG. 1) which is formed in the pen body 101, when the crown 102 is disposed on the pen body 101.
On the other hand, the second ink transfer channel 102TC2 is shorter than the first, leads to an ink transfer port 102IN2 which is configured to communicate with the second ink chamber 101C2 (FIG. 2) in the pen body 101. As will be noted, the second ink transfer channel 102TC2 leads around a leak test port 102LTP2 and terminates at the ink transfer port 102IN2 which is located between the leak test port 102LTP2 and an air vent fitment 102AV2. Another air vent fitment 102AV1 is formed on a stepped portion which is located at one end of the crown 102 and thus located in the position just beyond the end of the first ink transfer channel 102TC1 and adjacent the ink transfer port 102IN1.
It should be noted that the channels 102TC1, 102TC2 are carefully routed around the features on the upper face of the crown 102 including the leak test port 102LTP2 and fitment 102AV2. For this implementation, the features are disposed between the channels so that the channel design is optimized to minimize the number of bends therein. Channel cross section may also be optimized for flow and available crown real estate.
In this embodiment, the fitments I02AV1 and I02AV2 are arranged to permit air to pass in both directions therethrough but prevent the passage of ink in either direction and thus prevent leakage of ink from the ink chambers IOIC1 and IOIC2. These fitments I02AV1 and I02AV2, are also associated with an arrangement that controls the supply of ink into the chambers IOIC1 and IOIC2. This control will be explained herein later.
The upper edges CE (see FIG. 9) of the channels 102TC1 and 102TC2 are arranged to extend about the upper face of the crown 102 to the degree that, when the cap 106 is attached (e.g., welded into place) on the crown 102, the lower face of the cap 106 sealingly engages the upper edges CE and thus defines separate passages through which ink can flow. The cap 106 (see FIG. 1) is also provided with ports 106AV2 which correspond to the fitment 102AV1, and with port 106LTP2 which corresponds with the leak test port 102LTP2.
As noted above, and as best appreciated from FIG. 1, the stepped portion of the crown 102 is, in this particular embodiment, such that the cap 106 leaves leak test port 102LTP1 and fitment 102AV1, uncovered.
It should also be noted that the leak test ports 102LTP1 and 102LTP2 are permanently sealed after the cartridge has been successfully tested for leaks.
The lower face of the crown 102 is, as shown in FIG. 6, provided with pairs of pivotal flap-like members which shall be referred to as regulators R1, R2. The regulators R1, R2 are pivotally supported on webs or posts 102W which are formed on the lower face of the crown 102 (see FIGS. 7 and 8). The flap-like regulators R1, R2 are arranged to extend into the ink chambers 101CD and 101C2 when the crown 102 is seated on the pen body 101.
Each pair of pivotal members which comprise the regulators R1, R2 is provided with a valve member (not shown) which is configured to engage a structure, referred to herein as “volcano spout.” Each of these volcano spouts 102VS1, 102VS2, are formed on, or otherwise fixed to the lower face of the crown 102 (see FIGS. 7 and 8) so as to form valve seats with which the valve members can engage and close off communication between the ink chambers 101C1 and 101C2 (FIG. 2) and the ink transfer ports 102IN1 and 102IN2 respectively.
The regulators R1, R2 each respond to the amount of ink in the respective ink chambers and to move in a manner which brings a valve element into engagement with a corresponding volcano spout when the associated chamber is filled to a predetermined degree with fluid.
In this embodiment, the fitments 102AV1 and 102AV2, are arranged to allow air to pass therethrough, for example, into sealed bags or bladders which are respectively disposed in the first and second ink chambers 101C1 and 101C2 between the two flap-like members of each of regulators R1 and R2. As the ink in the chambers decreases, the pressure in the chambers momentarily decreases, and air is inducted through the fitments and into the respective sealed bags to return the chamber pressure to normal. As each bag fills with air, it expands and forces regulator members apart. The regulators R1, R2 therefore open the volcano spouts and allowing ink to flow through the ink ports into the pen chambers. As ink flows in, the pressure in the respective ink chambers is increased back to nominal, causing the bags to collapse forcing back out through the fitments and allowing the regulators R1, R2 to pivot toward one another and thus close the volcano spouts.
A biasing spring is used in the manner depicted in FIG. 6B to bias the regulators toward one another as the bags therebetween deflate and thus move the valve elements toward and into contact with the respective volcano spout closing the same. This prevents the ink chambers 101C1 and 101C2 from overfilling.
To seal and separate the two ink chambers 101C1 and 101C2 which are arranged in an aligned or tandem arrangement due to the elongate nature of the pen body 101, the lower face of the crown 102 is formed with two over-molded rubber gaskets 102G1 and 102G2. These are best seen in FIGS. 7 and 8.
While the invention has been described with only reference to a limited number of embodiments, it will be understood that a person skilled in the art to which the present invention pertains or most closely pertains, would be able to envisage and make various changes and modifications without departing from the scope of the present invention which is limited only by the appended claims.

## Claims

1. An ink cartridge, comprising:
a body having first and second ink holding chambers therein aligned axially along a length of the body; and
a cover covering the first and second chambers, the cover including first and second channels formed in an upper side of the cover for channeling ink to the first and second chambers, respectively, through corresponding first and second ink delivery ports, the second channel longer than the first channel and the first and second channels each having portions axially extending parallel to one another along the cover, wherein the cover includes first and second transversely aligned ink transfer ports by which ink enters below and through the cover into the first and second channels, respectively, the first and second ink transfer ports being proximate an axial end of the cover and connected to the first and second channels, respectively.

2. The ink cartridge of claim 1, further comprising first and second ink flow regulators supported by the cover, each ink flow regulator configured to extend into a corresponding one of the first and second ink holding chambers to regulate the passage of ink through the ink delivery ports in accordance with an amount of ink in the ink holding chamber.

3. The ink cartridge of claim 1, further comprising a cap capping the first and second channels to form first and second discrete passages through which ink may flow to the first and second ink holding chambers, respectively, through a corresponding one of the first and second ink delivery ports.

4. An ink cartridge, comprising:
a body having first and second ink holding chambers therein aligned axially along a length of the body; and
a cover covering the first and second chambers, the cover including: first and second channels therein for channeling ink to the first and second chambers, respectively, through corresponding first and second ink delivery ports; and first and second air vent fitments aligned with the first and second ink delivery ports, respectively, wherein the cover also includes first and second leak test ports aligned with the first and second air vent fitments fitments, respectively, the first leak test port disposed between the first and second channels; and a cap capping the first and second channels to form first and second discrete passages through which ink may flow to the first and second ink holding chambers, respectively, through a corresponding one of the first and second ink delivery ports.

5. The ink cartridge of claim 4, further comprising first and second ink flow regulators supported by the cover, each ink flow regulator configured to extend into a corresponding one of the first and second ink holding chambers to regulate the passage of ink through the ink delivery ports in accordance with an amount of ink in the ink holding chamber.

6. The ink cartridge of claim 4, wherein the cover includes first and second transversely aligned ink transfer ports by which ink enters the first and second channels, respectively, the first and second ink transfer ports being proximate an axial end of the cover and connected to the first and second channels, respectively.

7. An ink cartridge, comprising:
a body having first and second ink chambers therein aligned along an axial length of the body;
a cover including: a bottom surface covering the first and second chambers; a top surface opposite the bottom surface; first and second channels along the top surface of the cover for channeling ink to the first and second chambers, respectively, through corresponding first and second ink delivery ports that extend through the cover from the top surface to the bottom surface; and first and second air vent ports communicating with the first and second ink delivery ports; and
a cap capping the cover to close the first and second channels to form first and second discrete passages through which ink may flow to the first and second ink holding chambers, respectively, through a corresponding one of the first and second ink delivery ports, and the cap including third and fourth vent ports therein communicating with the first and second air vent ports in the cover, respectively.

8. The ink cartridge of claim 7, wherein the cover includes first and second transversely aligned ink transfer ports by which ink enters the first and second channels, respectively, the first and second ink transfer ports being proximate an axial end of the cover and connected to the first and second channels, respectively.