Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means
Reexamination Certificate
1996-04-26
2001-12-04
Le, N. (Department: 2861)
Incremental printing of symbolic information
Ink jet
Fluid or fluid source handling means
Reexamination Certificate
active
06325499
ABSTRACT:
BACKGROUND OF THE INVENTION
The subject invention is directed toward the art of ink jet printers and, more particularly, to an improved ink storage cartridge for such printers.
Cartridges for ink jet print heads or matrix print heads comprising a casing which contains a porous ink storage body are known from U.S. Pat. Nos. 4,771,295, 5,158,377, 5,221,148, and 5,421,658. A tubular socket of the print head extends into the interior of the casing and locally compresses the porous body. It is assumed that this local compression increases the capillarity of the porous body around the socket so that the ink content of the porous body can be used more completely.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a different way of utilizing the ink content of the porous body as completely as possible. The cartridge of the present invention comprises a housing with a bottom wall containing an opening for connection with the print head. An inside face of the bottom wall has an area around the opening provided with a plurality of grooves that open to the opening. The area is covered by a sieve that overlies the grooves. The housing further contains a porous body which is held in contact with the sieve. Preferably, the grooves extending from the open-like configuration comprise radial grooves extending from the opening and branch grooves extending from at least some of the radial grooves.
With the present invention, the active area of the sieve through which the ink passes when consumed by the print head is considerably increased as compared to the cartridges of the prior art. This substantially reduces the flow resistance of the filter.
Still other advantages and benefits of the invention will become apparent to those skilled in the art upon a reading and understanding of the following detailed description.
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Fay Sharpe Fagan Minnich & McKee LLP
Le N.
Nghiem Michael P.
Pelikan Produktions AG
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