Patent Application
20130021415
This invention relates generally to the field of ink jet printing systems. More particularly, the invention relates to delivering ink to a print engine within an ink jet printing system.
An ink jet printer is an example of a printing apparatus that ejects droplets of ink onto a recording medium, such as a sheet of paper, for printing an image on the recording medium. The ink jet printer includes a print engine having one or more ink jet print heads provided with an ink cartridge that accommodates the ink. In operation of the print engine the ink is supplied from an ink delivery system to ejection nozzles of each print head so that a printing operation is performed by ejection of the ink droplets from selected ejection nozzles.
In ink jet printers implementing suspended solids inks (e.g., Magnetic Ink Character Recognition (MICR) inks), the suspended ink particulate may settle in subtanks, resulting in clogs or coagulated particulate within the ink delivery system. Such clogs or coagulated material create problems with ink flow to the print heads, which requires service personnel to spend additional time manually cleaning the ink delivery system.
Therefore, a mechanism to prevent particles from settling in an ink delivery system is desired.
In one embodiment, an ink delivery system is disclosed. The ink delivery system includes one or more subtanks to store ink and an agitation system coupled to each of the one or more subtanks to vibrate a subtank to prevent ink particles from settling in the subtank
In another embodiment, an agitation unit is disclosed. The agitation unit is includes a bracket to mount on an ink subtank, a vibration unit mounted on the bracket to vibrate the subtank to prevent ink particles from settling in the subtank and an air pressure input mounted on the bracket to provide an air supply to the vibration unit.
A better understanding of the present invention can be obtained from the following detailed description in conjunction with the following drawings, in which:
An ink delivery system is described. In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. In other instances, well-known structures and devices are shown in block diagram form to avoid obscuring the underlying principles of the present invention.
Reference in the specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase “in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment.
Print server 120 subsequently communicates with printer 130. Printer 130 includes a control unit 140 and a print engine 160. Control unit 150 receives print jobs into printer 130. Further, control unit 150 processes and renders objects received from print server 120 and provides sheet maps for printing to print engine 160. Moreover, control unit 150 may include processing logic that may include hardware (e.g., circuitry, dedicated logic, programmable logic, microcode, etc.), software (such as instructions run on a processing device), or a combination thereof.
Print engine 160 provides an imaging process to mark a printable recording medium (e.g., paper). In one embodiment, print engine 160 includes forty print heads, each having fourteen hundred nozzles. However, other embodiments of print engine 160 may be implemented.
Ink bags 205A and 205B provides the supply of ink to print heads 240 via ink delivery system 220 under the control of controller 210. Controller 210 activates a corresponding solenoid and input manifold 222 to allow ink to flow into subtanks 225 at ink delivery system 220. Whenever ink is needed at print heads 240, controller 210 activates one or more of output manifolds 222 to allow ink flow to print heads 240 from subtanks 224 via distribution manifolds 230.
However when no ink is being delivered to print heads 230, the ink sits in the subtanks 224. As discussed above, suspended ink particulate may settle in subtanks 224 during this time, resulting in clogs or coagulated particulate within ink delivery system 220. According to one embodiment, an agitation unit 225 is coupled to each subtank 224 to provide a vibration to prevent ink particles from settling in a subtank 224.
However in other embodiments, vibration frequency of vibration unit 420 may also be adjusted by changing the distance of the momentum arm of agitation unit 225 (e.g., height of vibration unit 420 relative to subtank 224). In yet another embodiment, vibration unit 420 may be put into motion using other forms of power (e.g., electrical, fluid, etc.).
Throughout the foregoing description, for the purposes of explanation, numerous specific details were set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without some of these specific details. Accordingly, the scope and spirit of the invention should be judged in terms of the claims which follow.
