Typewriting machines – Typewriter controls other information recorder
Reexamination Certificate
2002-06-17
2004-09-28
Hirshfeld, Andrew H. (Department: 2854)
Typewriting machines
Typewriter controls other information recorder
C347S042000, C347S065000, C347S085000
Reexamination Certificate
active
06796731
ABSTRACT:
CO-PENDING APPLICATIONS
Various methods, systems and apparatus relating to the present invention are disclosed in the following co-pending applications filed by the applicant or assignee of the present invention simultaneously with the present application:
09/575,197
09/575,195
09/575,159
09/575,132,
09/575,123
09/575,148
09/575,130
09/575,165
09/575,153
09/575,118
09/575,131
09/575,116
09/575,144
09/575,139
09/575,186
09/575,185
09/575,191
09/575,145
09/575,192
09/575,181
09/575,193
09/575,156
09/575,183
09/575,160
09/575,150
09/575,169
09/575,184
09/575,128
09/575,180
09/575,149
09/575,179
09/575,133
09/575,143
09/575,187
09/575,155
09/575,196
09/575,198
09/575,178
09/575,164
09/575,146
09/575,174
09/575,163
09/575,168
09/575,154
09/575,129
09/575,124
09/575,188
09/575,189
09/575,162
09/575,172
09/575,170
09/575,171
09/575,161
09/575,141
09/575,125
09/575,142
09/575,140
09/575,190
09/575,138
09/575,126
09/575,127
09/575,158
09/575,117
09/575,147
09/575,152
09/575,176
09/575,151
09/575,177
09/575,175
09/575,115
09/575,114
09/575,113
09/575,112
09/575,111
09/575,108
09/575,109
09/575,110
09/575,182
09/575,173
09/575,194
09/575,136
09/575,119
09/575,135
09/575,157
09/575,166
09/575,134
09/575,121
09/575,137
09/575,167
09/575,120
09/575,122
The disclosures of these co-pending applications are incorporated herein by reference.
BACKGROUND OF THE INVENTION
The following invention relates to a laminated ink distribution structure for a printer.
More particularly, though not exclusively, the invention relates to a laminated ink distribution structure and assembly for an A4 pagewidth drop on demand printhead capable of printing up to 1600 dpi photographic quality at up to 160 pages per minute.
The overall design of a printer in which the structure/assembly can be utilized revolves around the use of replaceable printhead modules in an array approximately 8 inches (20 cm) long. An advantage of such a system is the ability to easily remove and replace any defective modules in a printhead array. This would eliminate having to scrap an entire printhead if only one chip is defective.
A printhead module in such a printer can be comprised of a “Memjet” chip, being a chip having mounted thereon a vast number of thermo-actuators in micro-mechanics and micro-electromechanical systems (MEMS). Such actuators might be those as disclosed in U.S. Pat. No. 6,044,646 to the present applicant, however, there might be other MEMS print chips.
The printhead, being the environment within which the laminated ink distribution housing of the present invention is to be situated, might typically have six ink chambers and be capable of printing four color process (CMYK) as well as infra-red ink and fixative. An air pump would supply filtered air to the printhead, which could be used to keep foreign particles away from its ink nozzles. The printhead module is typically to be connected to a replaceable cassette which contains the ink supply and an air filter.
Each printhead module receives ink via a distribution molding that transfers the ink. Typically, ten modules butt together to form a complete eight inch printhead assembly suitable for printing A4 paper without the need for scanning movement of the printhead across the paper width.
The printheads themselves are modular, so complete eight inch printhead arrays can be configured to form printheads of arbitrary width.
Additionally, a second printhead assembly can be mounted on the opposite side of a paper feed path to enable double-sided high speed printing.
OBJECTS OF THE INVENTION
It is an object of the present invention to provide an ink distribution assembly for a printer.
It is another object of the present invention to provide an ink distribution structure suitable for the pagewidth printhead assembly as broadly described herein.
It is another object of the present invention to provide a laminated ink distribution assembly for a printhead assembly on which there is mounted a plurality of print chips, each comprising a plurality of MEMS printing devices.
It is yet another object of the present invention to provide a method of distributing ink to print chips in a printhead assembly of a printer.
SUMMARY OF THE INVENTION
The present invention provides an ink distribution assembly for a printhead to which there is mounted an array of print chips, the assembly serving to distribute different inks from respective ink sources to each said print chip for printing on a sheet, the assembly comprising:
a longitudinal distribution housing having a duct for each said different ink extending longitudinally therealong,
a cover having an ink inlet port corresponding to each said duct for connection to each said ink source and for delivering said ink from each said ink source to a respective one of said ink ducts, and
a laminated ink distribution structure fixed to said distribution housing and distributing ink from said ducts to said print chips.
Preferably the laminated ink distribution structure includes multiple layers situated one upon another with at least one of said layers having a plurality of ink holes therethrough, each ink hole conveying ink from one of said ducts enroute to one of said print chips.
Preferably one or more of said layers includes ink slots therethrough, the slots conveying ink from one or more of said ink holes in an adjacent layer enroute to one of said print chips.
Preferably, the slots are located with ink holes spaced laterally to either side thereof.
Preferably the layers of the laminated structure sequenced from the distribution housing to the array of print chips include fewer and fewer said ink holes.
Preferably one or more of said layers includes recesses in the underside thereof communicating with said holes and transferring ink therefrom transversely between the layers enroute to one of said slots.
Preferably the channels extend from the holes toward an inner portion of the laminated structure over the array of print chips, which inner portion includes said slots.
Preferably each layer of the laminated is a micro-molded plastics layer.
Preferably, the layers are adhered to one another.
Preferably, the slots are parallel with one another.
Preferably, at least two adjacent ones of said layers have an array of aligned air holes therethrough.
The present invention also provides a laminated ink distribution structure for a printhead, the structure comprising:
a number of layers adhered to one another, each layer including a plurality of ink holes formed therethrough, each ink hole having communicating therewith a recess formed in one side of the layer and allowing passage of ink to a transversely located position upon the layer, which transversely located position aligns with a slot formed through an adjacent layer.
Preferably the slot in any layer of the structure is aligned with another slot in an adjacent layer of the structure and the aligned slots are aligned with a respective print chip slot formed in a final layer of the structure.
Preferably the layers are micro-molded plastics layers.
The present invention also provides a method of distributing ink to an array of print chips in a printhead assembly, the method serving to distribute different inks from respective ink sources to each said print chip for printing on a sheet, the method comprising:
supplying individual sources of ink to a longitudinal distribution molding having a duct for each said different ink extending longitudinally therealong,
causing ink to pass along the individual ducts for distribution thereby into a laminated ink distribution structure fixed to the distribution housing, wherein
the laminated ink distribution structure enables the passage therethrough of the individual ink supplies to the print chips, which print chips selectively eject the ink onto a sheet.
The present invention also provides a method of distributing ink to print chips in a printhead assembly of a printer, the method utilizing a laminated ink distributing structure formed as a number of micro-molded layers adhered to one another with each layer including a plurality of ink holes formed the
Hirshfeld Andrew H.
Silverbrook Research Pty Ltd
Williams Kevin D.
LandOfFree
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