Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Ink Jet Pump

IP.com Disclosure Number: IPCOM000088627D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 3 page(s) / 83K

Publishing Venue

IBM

Related People

Smith, NC: AUTHOR [+2]

Abstract

A variable speed drive motor 10 drives an impeller shaft 12 through a coupling 14. The coupling is splined so as to allow the impeller shaft to be axially free and rotationally secured. The impeller shaft 12 is connected to an impeller 16. The impeller 16 is free to rotate and has thrust pads 21 and 22 located at its upper and lower bearing surfaces which cause the impeller to float free of the bearing surfaces during rotation. An ink inlet port 30 allows ink to enter the open impeller section through the ink inlet passageway located in the center of the impeller shaft. When the impeller is rotated, centrifugal forces set up on the ink (by the radial impeller blades rotating the ink) move the ink into a spiral chamber 40. The ink moves out through the gaps to the ink common manifold 41 and into the ink outlet 45.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 3

Ink Jet Pump

A variable speed drive motor 10 drives an impeller shaft 12 through a coupling 14. The coupling is splined so as to allow the impeller shaft to be axially free and rotationally secured. The impeller shaft 12 is connected to an impeller
16. The impeller 16 is free to rotate and has thrust pads 21 and 22 located at its upper and lower bearing surfaces which cause the impeller to float free of the bearing surfaces during rotation. An ink inlet port 30 allows ink to enter the open impeller section through the ink inlet passageway located in the center of the impeller shaft. When the impeller is rotated, centrifugal forces set up on the ink (by the radial impeller blades rotating the ink) move the ink into a spiral chamber
40. The ink moves out through the gaps to the ink common manifold 41 and into the ink outlet 45.

Fig. 2 shows the details of the passageways in the impeller. The impeller has a double spiral and a double gap which causes the radial pressures on the impeller to be balanced. This minimizes radial wear on the pump.

Paddles 25 located on the impeller shaft serve to keep the new ink mixed with replenishment fluid and the recirculating ink as they enter the housing through the ink fill ports 50. Normally, the ink is maintained at about the level designated 60.

Ink pressure is controlled by controlling the speed of the drive motor. Because of the continuous nature of the ink pumping, no pressure surges occur in this type of centrifugal pump. Therefore, the pump does not require an accumulator. Among the advantages of this design are:
1. The two-exit-port design provides radial symmetry. There is no ne...